Philips chassis A8.0E_AA_sm.pdf part of Philips Philips chassis A8.0E_AA_sm.pdf, service manual;Service Modes, DST, errors and protections text manual preview

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1

Colour Television

Chassis

A8.0E
AA

M1

6

Frontill.eps 181298

ServiceManual
Table of contents
1. 2. 3. 4. 5. 6. Technical specifications Connection facilities and chassis overview Safety and maintenance instructions Mechanical instructions Service modes, DST, errors and protections Fault finding trees I2C diagram Supply voltages diagram Blockdiagrams Testpoint overviews Wire tree diagram

Page
2 3 5 7 9 19 22 23 24 26 27 Audio Processing (NICAM/2CS/FM/AM) Audio Output IO Switching IO front Front control CRT panel East West panel East West panel 16:9 I/O SCART panel Mains filter panel QSS-(BGLI-NICAM) panel QSS-DK panel Side AV panel Top Control panel TXT/EPG panel IC Overviews Alignments Circuit description Directions for use List of abbreviations Spare parts list diagram A11 diagram A12 diagram A13 diagram A14 diagram A15 diagram B diagram C diagram D diagram E diagram H diagram I diagram J diagram M diagram N diagram P 39 40 41 42 42 45 46 47 49 51 52 54 55 56 57 59 61 65 66 72 74 34,43 34,43 34,43 34,43 34,43 44 46 48 50 51 53 54 55 56 58

7. Electrical Diagrams and print lay-outs Power supply Horizontal deflection Vertical deflection Tuner and VIF Video processing Sync RGB Processing Controls Transparant OSD diagram A1 diagram A2 diagram A3 diagram A4 diagram A5 diagram A6 diagram A7 diagram A8 diagram A9

Diagram 28 30 31 32 33 35 36 37 38

PWB 34,43 34,43 34,43 34,43 34,43 34,43 34,43 34,43 34,43

8. 9. 10. 11. 12.

5 Subject in The Netherlands of Philips. without theby SM9872 TVPhilips Consumer Electronics B.V. Eindhoven, The Netherlands. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or 727 21586 Copyright prior permision Printed to modification Published reserved 1998 Service Department 4822 otherwise

©Copyright reserved 1998 Philips Consumer Electronics B.V. Eindhoven, The Netherlands. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permision of Philips.

Published by SM9872 TV Service Department

Printed in The Netherlands

Subject to modification

5 4822 727 21586

2
Mains voltage
1 Technical specifications

A8.0E

1

Technical specifications
: 230V AC (+/- 15%); 50-60Hz (+/- 5%) : 160 W : <= 3 W : +/- 300 Hz : +200 / -300 Hz : +/- 5 Hz : PAL UVSH; (TELE9X087A)

Maximum power consumption Standby power consumption Pull-in range colour synchronisation Pull-in range horizontal synchronisation Pull-in range vertical synchronisation TV bands (tuner)

2
2.1
2

Connection facilities and chassis overview
Specification of the terminal sockets
Connection facilities and chassis overview

A8.0E

3

FRONT CONTROL + I/O

IR

EXT1 EXT2 OR

RED

VOLUME PROGRAM

FRONT + TOP CONTROL
- VOLUME +

SIDE I/O
S-Video

AUDIO L, R Video

L - PROGRAM + Audio R

IR RED CL 86532002_014.AI 270298

2.1.1

CVBS(in/out) + RGB(in) - tuner at output
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 Pin 16 Pin 17 Pin 18 Pin 19 Pin 20 Pin 21 Audio R (0.5VRMS 1k) Audio R (0.2-2VRMS 10k) Audio L (0.5VRMS 1k) Audio Blue Audio L (0.2-2VRMS 10k) Blue (0.7Vpp/75) CVBS status (0-2V: INT; 4.5-7V: EXT1-16/9; 9.5-12V:EXT1- 4/3) Green Green (0.7Vpp/75) Red RGB status Red (0.7Vpp/75) RGB status (0-0.4V: INT;1-3V: EXT1/ 75) CVBS CVBS CVBS (1Vpp/75) CVBS (1Vpp/75) Earth screen k j k v v j j v

-

Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 Pin 16 Pin 17 Pin 18 Pin 19 Pin 20 Pin 21

C C (300mVpp/75) CVBS CVBS CVBS (1Vpp/75) CVBS/Y (1Vpp/75) Earth screen

v j v v k j v

2.1.3
j v v j v v k j v

Audio out
- Cinch - Cinch Audio L (red) (0.5VRMS 1k) Audio R (white) (0.5VRMS 1k) q q

2.1.4

Audio/video in
- Cinch - Cinch - Cinch CVBS (yellow) (1V) Audio L (red) (0.2-2VRMS 10k) Audio R (white) (0.2-2VRMS 10k) q q q

2.1.5

Headphone
- Jack 32-2000 (10mW) t

2.1.2

CVBS (in/out) + SVHS(in)
Input: EXT2 then output = tuner; input: other then output = input Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Audio R (0.5VRMS 1k) Audio R (0.2-2VRMS 10k) Audio L (0.5VRMS 1k) Audio Audio L (0.2-2VRMS 10k) CVBS status (0-2V: INT; 4.5-7V: EXT2-16/9; 9.5-12V:EXT2-4/3) k j k j

2.1.6

SVHS
1. 2. 3. 4. p Y ( 1Vpp/75) C (0.3Vpp/75)

- Pin 9 - Pin 10

4
2.2

A8.0E
PCB location drawing

2

Connection facilities and chassis overview

POWER SUPPLY HOR. DEFLECTION + LINE OUTPUT VERTICAL DEFLECTION TUNER + VIF

A1 A2 A3 A4 A5 A6 A7 A8 A9 A11 A12 A13 A14 A15 H

N B C D P M

TOP CONTROL PANEL VIDEO PROCESSING CRT PANEL SYNC EAST WEST PANEL RGB PROCESSING EW + PANORAMA PANEL CONTROLS TXT/EPG PANEL TRANSPARANT OSD SIDE AV PANEL AUDIO PROCESSING NICAM/2CS/FM/AM AUDIO OUTPUT

J I

QSS-DK PANEL QSS (BGLI NICAM)

IO SWITCHING FRONT AV FRONT CONTROL

E

I/O SCART PANEL MAINS FILTER PANEL

CL 86532017_006.ai 130598

3
3.1
3

Safety and maintenance instructions
Safety instructions for repairs
Safety and maintenance instructions

A8.0E

5

Figure 3-1
1. Safety regulations require that during a repair: the set should be connected to the mains via an isolating transformer; safety components, indicated by the symbol (see fig. 3.1), should be replaced by components identical to the original ones; when replacing the CRT, safety goggles must be worn.

When the set is used in circumstances with higher dust, grease or moisture levels, for example in a kitchen, the recommended interval is 1 year. The maintenance inspection contains the following actions: · Execute the above mentioned 'general repair instruction'. · Clean the power supply and deflection circuitry on the chassis. · Clean the picture tube panel and the neck of the picture tube.

3.3

Warnings

2. Safety regulations require that after a repair the set must be returned in its original condition. In particular attention should be paid to the following points. As a strict precaution, we advise you to resolder the solder joints through which the horizontal deflection current is flowing, in particular: · all pins of the line output transformer (LOT); · fly-back capacitor(s); · S-correction capacitor(s); · line output transistor; · pins of the connector with wires to the deflection coil; · other components through which the deflection current flows. Note: This resoldering is advised to prevent bad connections due to metal fatigue in solder joints and is therefore only necessary for television sets older than 2 years. The wire trees and EHT cable should be routed correctly and fixed with the mounted cable clamps. The insulation of the mains lead should be checked for external damage. The mains lead strain relief should be checked for its function in order to avoid touching the CRT, hot components or heat sinks. The electrical DC resistance between the mains plug and the secondary side should be checked (only for sets which have a mains isolated power supply). This check can be done as follows: · unplug the mains cord and connect a wire between the two pins of the mains plug; · set the mains switch to the on position (keep the mains cord unplugged!); · measure the resistance value between the pins of the mains plug and the metal shielding of the tuner or the aerial connection on the set. The reading should be between 4.5 M and 12 M; · switch off the TV and remove the wire between the two pins of the mains plug. The cabinet should be checked for defects to avoid touching of any inner parts by the customer.

1. ESD All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD). Careless handling during repair can reduce life drastically. When repairing, make sure that you are connected with the same potential as the mass of the set by a wristband with resistance. Keep components and tools also at this same potential. Available ESD protection equipment: anti-static table mat (large 1200x650x1.25mm) 4822 466 10953 anti-static table mat (small 600x650x1.25mm) 4822 466 10958 anti-static wristband 4822 395 10223 connection box (3 press stud connections, 1 M) 4822 320 11307 extension cable (2 m, 2 M; to connect wristband to connection box) 4822 320 11305 connecting cable (3 m, 2 M; to connect table mat to connection box) 4822 320 11306 earth cable (1 M; to connect any product to mat or connection box) 4822 320 11308 complete kit ESD3 (combining all 6 prior products small table mat) 4822 310 10671 wristband tester 4822 344 13999 2. In order to prevent damage to ICs and transistors, all highvoltage flashovers must be avoided. In order to prevent damage to the picture tube, the method shown in Fig. 3.2 should be used to discharge the picture tube. Use a highvoltage probe and a multimeter (position DC-V). Discharge until the meter reading is 0V (after approx. 30s). 3. Together with the deflection unit and any multipole unit, the flat square picture tubes used from an integrated unit. The deflection and the multipole units are set optimally at the factory. Adjustment of this unit during repair is therefore not recommended. 4. Be careful during measurements in the high-voltage section and on the picture tube. 5. Never replace modules or other components while the unit is switched on. 6. When making settings, use plastic rather than metal tools. This will prevent any short circuits and the danger of a circuit becoming unstable. 7. Wear safety goggles during replacement of the picture tube

3.2

Maintenance instruction
It is recommended to have a maintenance inspection carried out by a qualified service employee. The interval depends on the usage conditions: When the set is used under normal circumstances, for example in a living room, the recommended interval is 3 to 5 years.

3.4

Notes
1. The direct voltages and oscillograms should be measured with regard to the tuner earth , or hot earth as this is called (see fig. 3.3) 2. The direct voltages and oscillograms shown in the diagrams are indicative and should be measured in the Service Default Mode (see chapter 8) with a colour bar signal and stereo sound (L:3 kHz, R:1 kHz unless stated otherwise) and picture carrier at 475.25 MHz.

6

A8.0E

3

Safety and maintenance instructions

3. Where necessary, the oscillograms and direct voltages are measured with and without aerial signal. Voltages in the power supply section are measured both for normal operation and in standby . These values are indicated by means of the appropriate symbols (see fig. 3.3). 4. The picture tube PWB has printed spark gaps. Each spark gap is connected between an electrode of the picture tube and the Aquadag coating. 5. The semiconductors indicated in the circuit diagram and in the parts lists are completely interchangeable per position with the semiconductors in the unit, irrespective of the type indication on these semiconductors. 6. Manufactured under license from Dolby Laboratories Licensing Corporation. 7. DOLBY, the double D symbol and PRO LOGIC are trademarks of Dolby Laboratories Licensing Corporation.

V

CL 26532098/042 140792

Figure 3-2
tuner earth tuner aarde la masse du tuner Tuner-Erde massa del tuner tierra del sintonizador with aerial signal met antenne signaal avec signal d'antenne mit Antennensignal con segnale d'antenna con la señal de antena normal condition normaal bedrijf fonctionnement normal normaler Betrieb funzionamento normale funcionamiento normal hot earth hete aarde la terre directe heißen Erde massa calda tierra caliente without aerial signal zonder antenne signaal sans signal d'antenne .ohne Antennensignal senza segnale d'antenna sin la señal de antena stand by stand by position de veille in Bereitschaft modo di attesa posición de espera

Figure 3-3

4
4

Mechanical instructions
In this chapter the mechanical provisions of the A8 chassis are described
Mechanical instructions

A8.0E
4.2.2 Mono carrier (figure 4-2)

7

4.1

Removing the rear cover
In order to remove the rear cover from the A8, all screws at the side, the bottom and the top of the rear cover have to be removed. The screws on the I/O panel should NOT be removed.

4.2
4.2.1

Service positions
Seperate mains filter (figure 4-1)

1 1
M1 6

2

CL 86532017_002.ai 180598

Figure 4-2
1
To remove the chassis tray from the cabinet: · · disconnect the degaussing coil (connector M16 on the mono carrier) pull the clips (1) forward and pull the chassis tray as indicated (2)

2
CL 86532017_001.ai 180598

The chassis tray should be turned 90 degrees counter clock wise and flipped over to access the copper side of the mono carrier.

4.2.3

Environment independent position (figure 4-3)

Figure 4-1
CAUTION! Unplug the mains cord before working on the seperate mains filter; the seperate mains filter carries permanent mains voltage (even when the mains knob is switched OFF). To disconnect the seperate mains filter bracket from the chassis tray: · · firmly depress the click (with a screwdriver) in the chassis tray (1) push the mains filter bracket in the direction of the CRT
1 2

NEL IO PA KET C BRA

3

A

B

CL 86532017_003.ai 180598

To remove the seperate mains filter panel from its bracket: · · push the 2 clips at the right hand side of the mains filter bracket outside (2) lift the panel from its bracket

Figure 4-3
For home repair the chassis tray with mono carrier can be fixed in the cabinet. · · · turn the chassis tray 90 degrees counter clock wise (1) flip the tray with the I/O panel towards the CRT (2) press (the hook of) the chassis tray firmly into the designated hole in the cabinet bottom (3) and pull the chassis tray forward (the speaker cables may have to be disconnected)

8
4.2.4

A8.0E
I/O panel (figure 4-4)

4

Mechanical instructions

4 4 3 2
(4X)

1

L

S

P

CL 86532017_004.ai 180598

Figure 4-4
To access the copper side of the IO panel: · · push the clips (1) in the direction of the CRT (If the clips are broken, the I/O panel can also be screwed to chassis tray) slide the I/O panel bracket (2) to its horizontal position

To remove the I/O panel from its bracket: · · · remove the screws of the panel (3) remove the screws of the small bracket (4) push down the click that holds the panel in place

4.2.5

Repairing the mono carrier (figure 4-5)

2

1
CL 86532017_005.ai 180598

Figure 4-5
For full access to the component and copper side of the mono carrier, it can be removed from the chassis tray. · · push the clicks of the chassis tray outwards (1) lift the mono carrier from the tray (2)

5
5

Service Modes, DST, errors and protections
In this chapter the following paragraphs are included:
Service Modes, DST, errors and protections

A8.0E

9

5.1 Test points 5.2 Service Modes and Dealer Service Tool (DST) 5.3 Error code buffer and error codes 5.4 The "blinking LED" procedure 5.5 Trouble shooting tips 5.6 Customer service mode

By transmitting the "DEFAULT" command with the RC7150 Dealer Service Tool (this works both while the set is in normal operation mode or in the SAM) By shorting jumpers 9040 and 9041 on the monocarrier with a screwdriver while switching on the set

By temporarily shorting jumper 9040 and 9041 when switching the set on, the 5V protection is disabled. CAUTION ! Overriding the 5V protection should only be used for a short period of time Blinking LED procedure When an error code is present in the error buffer, the LED will blink the number of times, equal to the value of the most current error code. For recognition of the SDM, "SDM" is displayed at the upper right side of the screen.

5.1

Test points
The A8 chassis is equipped with test points in the service printing. These test points are referring to the functional blocks: · · · · · · · · A1-A2-A3, etc.: Test points for the audio processing circuitry C1-C2-C3, etc.: Test points for the control circuitry F1-F2-F3, etc.: Test points for the frame drive and frame output circuitry I1-I2-I3, etc.: Test points for the intermediate frequency circuitry L1-L2-L3, etc.: Test points for the line drive and line output circuitry P1-P2-P3, etc.: Test points for the power supply T1-T2-T3, etc.: Test points for the teletext circuitry V1-V2-V3, etc.: Test points for the video processing circuitry

SDM Menu

SDM

ERR

nn

nn

nn

nn

nn

nn

Measurements are performed under the following conditions:
+ MENU

Video: colour bar signal; audio: 3KHz left, 1KHz right
SDM

P S F I

I O E N

C U A S

T N T T

URE D URES ALL

B C C S C

R O O H O

I L N A L

G O T R O

H U R P U

SDM TNESS R AST NESS R TEMP

5.2

Service modes and Dealer Service Tool (DST)
For easy installation and diagnosis the dealer service tool (DST) RC7150 can be used. When there is no picture (to access the error code buffer via the OSD), DST can enable the functionality of displaying the contents of the entire error code buffer via the blinking LED procedure. The ordering number of the DST (RC7150) is 4822 218 21232.

CL 86532036_00 260598

Figure 5-1 Service Default Mode screen
Exit the SDM: Switch the set to Standby (the error buffer is also cleared) Note: When the mains power is switched off while the set is in SDM, the set will switch to SDM immediately when the mains is switched on again. The SDM sets the following pre-defined conditions: · · Pal/Secam sets: tuning at 475.25 PAL NTSC sets: tuning at channel 3 (61.25MHz)

5.2.1

Installation features for the dealer
The dealer can use the RC7150 for programming the TV-set with presets. 10 Different program tables can be programmed into the DST via a GFL TV-set (downloading from the GFL to the DST; see GFL service manuals) or by the DST-I (DST interface; ordering code 4822 218 21277). For explanation of the installation features of the DST, the directions for use of the DST are recommended (For the A8 chassis, download code 4 should be used).

5.2.2

Diagnose features for the servicer
A8 sets can be put in the two service modes via the RC7150. These are the Service Default Mode (SDM) and the Service Alignment Mode (SAM). SDM can also be entered by short circuiting the jumpers 9040 and 9041 on the chassis with a screwdriver. Service Default Mode (SDM) The purpose of the SDM is: · · · provide a situation with predefined settings to get the same measurements as in this manual start the blinking LED procedure have to possibility to override the 5V protection

Volume level is set to 25% (of the maximum volume level). Other picture and sound settings are set to 50%. The following functions are switched off in SDM (and after leaving SDM): · · Timer Sleep timer

The following functions are disabled during SDM (and enabled after leaving SDM) · · · Parental lock Hospitality Mode No-ident Timer (normally the set is automatically switched off when no video signal (IDENT) was received for 15 minutes).

All other controls operate normally. Entering the SDM:

10

A8.0E

5

Service Modes, DST, errors and protections

Special functions in SDM ACCES TO NORMAL USER MENU: Pressing the "MENU" button on the remote control switches between the SDM and the normal user menus (with the SDM mode still active in the background) CHANNEL SEARCH: Pressing the "P+" button of the remote control starts a tuning search. Search is indicated by a blinking led (this stops when a transmitter is found; the transmitter is stored on the highest channel number, typically this is 99 and the tv switches to this preset) ERROR BUFFER: Pressing the "OSD" button of the remote control shows/hides the error buffer. OSD can be hidden to prevent interference with oscillogram measurements. ACCES TO SAM: By pressing the "VOLUME +" and "VOLUME -" buttons on the local keyboard simultaneously the set switches from SDM to SAM. Service Alignment Mode (SAM) The purpose of the SAM is to do alignments, option settings, display/clear the error code buffer and reload default values. Entering SAM: By transmitting the "ALIGN" command with the RC7150 Dealer Service Tool (this works both while the set is in normal operation mode or in the SDM) By pressing the "VOLUME +" and "VOLUME -" key on the local keyboard simultaneously when the set is in SDM

EXIT SAM: Switch the set to Standby (the error buffer will be erased) Note: When the mains power is switched off while the set is in SAM, the set will enter to SDM immediately when the mains is switched on again. In the SAM the following information is displayed on the screen:

5

Service Modes, DST, errors and protections
SAM Menu

A8.0E

11

P S F I

I O E N

C U A S

T N T T

URE D URES ALL

B C C S C

R O O H O

I L N A L

G O T R O

H U R P U

SAM TNESS R AST NESS R TEMP

MENU

1 nnnn ERR OP R E O A E R P L L A T I

2

MENU

3 5263-2-23 nn nn nnn nnn

4

5 SAM

LOAD NOW DON'T LOAD

A80EU1-1.0 nn nn nn nn nnn nnn nnn O S I G AD DEFAULT E BUFFER ONS NMENTS

nnn

nnn O O S A A B6 B7 TORE L K nnn nnn ON OFF

MENU

6

MENU MENU

G G W T B

E E H U T

O O I N S

M M T E C

ETRY ETRY SW E TONE R SOUND

H H S V V

O O E E E

R R R R R

S W V S W

H I . H I

I D B I D

F T L F T

T nn H nn ANKING T nn H nn

n n n n

MENU

COLD

Rnnn

Gnnn

Bnnn

Only when HW option is present

TDA9855 L S W A A A A A n n n n n n n nn I I A A A F PLL F PLL GC FA FB nnn nnn nnn n n
CL 86532036_001.ai 260598

MENU

MENU

Figure 5-2 Service Alignment Mode screens and structure

12

A8.0E

5

Service Modes, DST, errors and protections
when an error occurs that is not yet in the error code buffer, the error is written at the left side and all other errors shift one position to the right the error code buffer will be cleared in the following cases: by activating the ERASE BUFFER in SAM menu 1. exiting SDM or SAM with the "Standby" command on the remote control 2. transmitting the commands "DIAGNOSE 99 OK" with the DST (RC7150) or with Compair The error buffer will be automatically reset if its contents have not changed for 50 hours By leaving SDM or SAM with the mains switch, the error buffer is not reset.

Explanation notes/references: (1) Operation hours timer (hexadecimal) (2) Software identification of the main micro controller (A80BBC-X.Y) · · · · A80 is the chassis name for A8.0E BBC is 2 letter and 1 digit combination to indicate the software type and the supported languages: X = (main version number) Y = (subversion number)

(3) Software identification of a separate Teletext or EPG micro controller (DDDD E FF) (4) Error buffer (6 errors possible) (5) Option bytes (7 codes possible), summary of options are explained below (6) Sub menus are listed in a scroll-menu. SAM menu control Menu items can be selected with the cursor UP/DOWN key. The selected item will be highlighted. When not all menu items fit on the screen, moving the cursor UP/DOWN will display the next/previous menu items. With the cursor LEFT/RIGHT keys, it is possible to: (de)activated the selected menu item (e.g. LOAD DEFAULT) change the value of the selected menu item activate the selected submenu (e.g GEOMETRY)

Examples: ERROR: 0 0 0 0 0 0: No errors detected ERROR: 6 0 0 0 0 0: Error code 6 is the last and only detected error ERROR: 5 6 0 0 0 0: Error code 6 was first detected and error code 5 is the last detected (newest) error

5.3.2

Error codes
In case of a non-intermittent faults, clear the error buffer before starting the repair to prevent that "old" error codes are present. If possible check the entire content of the error buffers. In some situations an error code is only the RESULT of another error code (and not the actual cause). Note: a fault in the protection detection circuitry can also lead to a protection. Error 0 = No error Error 1 = X-ray protection, E/W protection and/or Vertical protection X-ray protection, E/W protection and/or Vertical protection active; set is switched to protection; error code 1 is placed in the error buffer; the LED will blink 1 time (repeatedly). If this happens, isolate each circuit to determine the cause. These circuits are: · · · · X-Ray protection: If this protection is active, the most likely cause is the LOT. EW protection: If this protection is active, the causes could be one of the following; bad contacts of: horizontal deflection coil linearity coil 5621 S-correction capacitor 2629/2630 flyback capacitor 2613/2625 line output stage short circuit of: flyback diode 6621 EW transformer (bridge coil) 5624/5625 or 5680/5682/ 5683 (version dependent) S-correction capacitor 2629/2630 EW driver 7680 Vertical protection: If this protection is active, the causes could be one of the following (most likely in the vertical output stage): 7700 is faulty poor contact or open circuit of deflection coil +13V_+20V and/or -13V not present

Access to normal user menu Pressing the "MENU" button on the remote control switches between the SDM and the normal user menus (with the SAM mode still active in the background). Pressing the MENU key in a submenu will go to the previous menu. The menus and submenus ERASE BUFFER Erasing the contents of the error buffer. Select the ERASE BUFFER menu item and press the MENU RIGHT key. The contents of the error buffer is cleared. RELOAD DEFAULT Reloading memory default values. All default settings can be reloaded into the memory (EEPROM). Select the RELOAD DEAULT menu item and press the MENU RIGHT key. Select LOAD NOW and press MENU RIGHT to reload all settings, then switch the set to STANDBY. The default settings are activated when the set is switched on. CAUTION! Use this menu with extreme care. Otherwise customer settings will be lost. The functionality of the OPTIONS and ALIGNMENTS (GEOMETRY, GEOMETRY SW, WHITE TONE and TUNER) sub menus is described in chapter 8.

5.3
5.3.1

Error code buffer and error codes
Error code buffer
The error code buffer contains all errors detected since the last time the buffer was erased. The buffer is written from left to right. ·

5

Service Modes, DST, errors and protections
Error 2 = High beam current protection High beam protection active; set is switched to protection; error code 2 is placed in the error buffer; the LED will blink 2 times (repeatedly). As the name implies, the cause of this protection is a too high beam current (bright screen with flyback lines). Check whether the +200V supply to the CRT panel is present. If the voltage is present, the most like cause is the CRT panel or the picture tube. Disconnect the CRT panel to determine the cause. If the +200V voltage is not present, check R3840, R3643 and D6641. Error 3 = Reserved Error 4 = +5V protection 5V protection active; set is switched to protection; error code 4 is placed in the error buffer; the LED will blink 4 times (repeatedly). A 5V failure can cause a drop in the 5V supply output, resulting in undefined behaviour of the set. Therefore, all I2C devices connected to the 5V supply are constantly monitored. When non of these devices responds to the micro controller for a prolonged time, the micro controller assumes that there is a failure in the 5V supply. By starting up the set with the service jumpers shorted, the 5V protection is disabled and it is easier to determine the cause. +5V protection will be activated when these I2C devices fail (no I2C communication): · · Main Tuner 1125 on main panel ITT sound processor IC7430 on main panel

A8.0E

13

Error 8 = Microprocessor internal RAM error The micro controller internal RAM test indicated an error of the micro controller internal memory (tested during start-up); Error 10 =NV memory I2C error. NV memory (EEPROM) does not respond to the micro controller Error 11 = micro controller / NV Memory identification error. During the last start-up the NVM and the micro controller did not recognize each other (e.g. one of them was replaced), therefore the NVM was loaded with default values. Error 12 =YUV IC I2C error (TDA9178) (RESERVED). TDA9178 does not respond to the micro controller Error 13 =Reserved Error 14 =Sound processor I2C error (MSP34X0). Sound controller MSP3400 or MSP3410 does not respond to the micro controller. Error 15 =Reserved Error 16 =PLL tuner I2C error. The PLL tuner does not respond to the micro controller Error 17/18 =Reserved Error 19 =2nd micro controller (EPG/TXT) error. 2nd micro controller does not respond to the main micro controller. Error 20/21 =Reserved Error 22=2nd micro controller (EPG/TXT) internal memory error. The EPG/TXT micro controller internal RAM test indicated an error of the EPG/TXT micro controller internal memory (tested during start-up). Error codes 1,2, 4 and 5 are protection codes and in this case supplies of some circuits will be switched off. Also, in protection the LED will blink the number of times equivalent to the most recent error code.

The following tips are useful to isolate the problem area after overriding the +5V protection. Determine whether: 1. the +5V source is working properly; isolate coil 5430 and jumper 9044 and measure the +5V 2. ITT sound processor circuit is loading the +5V; isolate coil 5430 3. the tuner is loading the +5V source; isolate jumper 9044 4. main tuner circuit is loading the +5V source; isolate coil 5100 Caution! Overriding the 5V protection when there is a 5V failure can increase the temperature in the set and may cause permanent damage to components. Do not override the 5V protection for a prolonged time. Error 5 = Bimos software protection active (Bimos start-up register is corrupted or the I2C line to the Bimos is always low or no supply at pin 12 of the BiMOS). This error is usually detected during start-up and hence will prevent the set from starting up. Note that this error may also be reported as a result of error codes 1 or 2 (in that case the Bimos might not be the actual problem) Error 6 = Bimos (TDA884X) I2C error Note that this error may also be reported as a result of error codes 1 or 2 (in that case the Bimos might not be the actual problem) Error 7 = General I2C error. This will occur in the following cases: · · · SCL or SDA is shorted to ground SCL is shorted to SDA SDA or SCL connection at the micro controller is open circuit. 3 4

5.3.3

Error code table

Error code 0 1

Error description

Possible defective components EW/Vertical circuit is defective CRT amplifier circuit, picture tube or +200V missing

No error detected X-ray protection / EW and/or Vert protection active High beam protection active

2

Reserved 5V protection active +5V supply line is low or short circuit s/w protection active or BIMOS register is corrupted IC7150 IC7150

5

BIMOS

6

BIMOS I2C error

14
7

A8.0E
General I2C bus error

5

Service Modes, DST, errors and protections
I2C bus s/c or o/c on µP IC7000

5.5

TROUBLE SHOOTING TIPS
In this paragraph some trouble shooting tips for the deflection and power supply circuitry are described. For detailed diagnostics, check the fault finding tree.

8 9 10 11 12 13 14

Main µP Internal RAM error Reserved NVM I2C error NVM identification error Reserved Reserved Sound processor I2C error

IC7088 IC7088

5.5.1

THE DEFLECTION CIRCUIT:
1. Measure the VBAT (140V) is present across 2917 (A1 POWER SUPPLY). If the voltage is not present, disconnect coil 5930 (A1 Power Supply) (whole horizontal deflection stage is disconnected). If the voltage is present then the problem might be caused by the deflection circuit. Possibilities: Transistor 7620 is faulty The driver circuit around transistor 7610 is faulty No horizontal drive signal coming from the BIMOS 7150-D pin 40 2. Note: If the C and E of 7620 is shorted, hick-up noise can be heard from the power supply circuit. 3. To determine whether the fault is present in the horizontal deflection circuit (A2 HOR. DEFLECTION+LINE OUTPUT) or in the EW circuit/panel (screen size above 21"), desolder E61 pin 13 or M61 pin 13 and insert jumpers into position numbers 9605 (in this case the EW protection is disabled). If the basic deflection is working (picture is parabolic distorted), then the fault is located in the EW circuit/panel. If there is no hor. deflection, the fault is present in the basic deflection circuitry. 4. Also take note of protection circuits in the line output stage. If any of these circuits are activated, the set will shut down. Depending on protections, the LED will blink according to the fault defined. In order to determine which protection circuit is active, isolation of circuits is necessary. These protection circuits are: High beam protection (LED blinks repetitively 2 times): see error code 2 explanation. Any of the following protection circuit is active, it will cause LED to blink repetitively 1 times. If this happen, isolate each circuit to determine the cause.; see error code 1.

IC7430 (2CS/ Nicam)

15 16 17 18 19

Reserved Main tuner I2C error Reserved Reserved Teletext/EPG processor I2C error Reserved Reserved Teletext/EPG processor internal RAM error IC7007 on TXT/ EPG error IC7007 on TXT/ EPG panel U1125

20 21 22

5.4

The "blinking LED" procedure
The contents of the error buffer can also be made visible through the "blinking LED" procedure. This is especially useful when there is no picture. There are two methods: 1. When the SDM is entered, the LED will blink the number of times, equal to the value of the last (newest) error code (repeatedly). 2. With the DST all error codes in the error buffer can be made visible. Transmit the command: "DIAGNOSE x OK" where x is the position in the error buffer to be made visible x ranges from 1, (the last (actual) error) to 6 (the first error). The LED will operate in the same way as in point 1, but now for the error code on position x. Example: Error code position1 2 3 4 5 6 Error buffer:8 9 5 0 0 0 · · · · after entering SDM: blink (8x) - pause - blink (8x) - etc. after transmitting "DIAGNOSE 2 OK" with the DST blink (9x) - pause - blink (9x) - etc. after transmitting "DIAGNOSE 3 OK" with the DST blink(5x) - pause - blink(5x) - etc. after transmitting "DIAGNOSE 4 OK" with the DST nothing happens

5.5.2

THE POWER SUPPLY
To trouble shoot the A8 SMPS, first check the +5V_STBY voltage on IC7907, pin 7. If this voltage is not present, check fuse 1906 and D6917. If 1906 or D6917 is not open circuit, the problem might be caused on the primary side of the switching supply. Check the output of the bridge diodes on the cathode side of D6931/D6903 pin 1 for approximately 300V DC. If this voltage is missing, check the bridge diodes and the fuse 1900 on the mains filter panel (H circuit). If fuse F1900 is found open, check IC7902 (circuit A1) between pins 3 and 2 to make sure that there is no short circuit present. If the 300V DC is present on pin 3 of IC7902, check for a startup voltage of 16V on pin 4 of IC7902. If not startup voltage is present, check if R3917 is open; a short circuit between pin 4 and 5 will also cause this problem. It is necessary to have a feedback signal from the hot secondary side of switch mode transformer T5912 at pin 8 and pin 9 for the power supply to oscillate. If this startup voltage is present on pin 4 of IC7902 and the supply is not oscillating, check R3959 and D6908. The A8 power supply has been designed with Over Voltage Protection (OVP). To determined whether OVP is active, check whether +5V standby is present at IC7907 pin 7. If not, check the components 1905, 6914, 6960, 3926 and 3920. If these components are O.K., then replace opto-coupler 7950.

NOTE: If errors 1, 2, 4 or 5 occurs the LED ALWAYS blinks the last occurred error, even if the set in NOT in service mode.

5

Service Modes, DST, errors and protections
Another way to confirm whether OVP is active is to measure the voltage with an oscilloscope at IC7902 pin 4. If the voltage is fluctuating between 11-14V, then check the components as described in the above mentioned paragraph.

A8.0E

15

5.6

Customer Service Mode (CSM)
All A8.0 sets are equipped with the "Customer Service Mode" (CSM). CSM is a special service mode that can be activated and deactivated by the customer, upon request of the service technician/dealer during a telephone conversation in order to identify the status of the set. This CSM is a 'read only' mode, therefore modifications in this mode are not possible. Entering the Customer Service Mode. The Customer Service Mode can be switched on by pressing simultaneously the button (MUTE) on the remote control and any key on the control buttons (P+, P-, VOL +, VOL -) on the TV for at least 4 seconds. When the CSM is activated: · · picture and sound settings are set to nominal levels modes that interfere with the behaviour of the set are switched off (sleep timer, auto standby, etc.)

Error code buffer (see paragraph 5.3). Displays the last 6 errors of the error code buffer. As soon as the built-in diagnosis software has detected an error the buffer is adapted. The latest (=newest) error is displayed on the leftmost position. Each error code is displayed as a 1 or 2 digit number. When less than 6 errors occur, the rest of the position(s) is(are) displayed as '0'. See paragraph 5.3 of this chapter for a detailed description of the error codes. · "OP xxx xxx xxx xxx xxx xxx xxx" displayed on line 3

Option bytes. Software and hardware functionality of the A8.0 is controlled by option bits. An option byte or option number represents 8 of those bits. Each option number is displayed as a decimal number between 0 and 255. The set may not work correctly when an incorrect option code is set. See chapter 8 for more information on correct option settings · "SYS XXXXX" displayed on line 4

Indicates which colour and sound system is installed for this preset: AUTO PAL BG PAL I PAL DK SECAM DK NTSC-M

Exit the Customer Service Mode. The Customer Service Mode will switch off after:

Complaints that may be caused by an incorrect system setting: pressing any key on the remote control handset (except "P+" or "P-") switching off the TV set with the mains switch. · · · · no colours colours not correct unstable picture noise in picture

All settings that were changed at activation of CSM are set back to the initial values

To change the system setting of a preset:

5.6.1

The Customer Service Mode information screen
After switching on the Customer Service Mode the following screen will appear. 1. 2. 3. 4. press the "MENU" button on the remote control select the INSTALL sub menu select the MANUAL STORE sub menu select and change the SYSTEM setting until picture and sound are correct 5. select the STORE menu item "HOSP" displayed on line 4 of the CSM menu. Indicates that the "hospitality" mode is enabled. Complaints that may be caused by the activation of "hospitality mode":
CL 86532036_002.ai 260598

CSM Menu
1 2 3 4 5 6 7 n n n n C O S S L T O P Y L O I A A A B B C - X . Y D D D D - E - F F C S M D E S n n n n n n n n n n S H O S P E E P N O T C K S K I P M E R n n n n n n n n n n n n n n n n n T U N E D P E D

n n n

n n n

Figure 5-3 Customer Service Mode screen
The Customer Service Menu shows the following information: · "nnnnn" displayed on line 1

· · · · ·

"HOSPITALITY ON" displayed on TV screen Installation menu does not work Personal presets are not automatically stored Volume level cannot be increased above a certain level Some channels/presets are blanked (only audio)

To switch off the hospitality mode: Hexadecimal counter of operating hours. Standby hours are not counted as operating hours. The Customer Service Menu shows the following information: · "A80BBC-X.Y DDDD E FF" displayed on line 1 1. go to preset 38 2. press the "OSD" and "MENU" buttons on the local keyboard simultaneously for 3 seconds · "SLEEP" displayed on line 5 of the CSM screen

Software identification of the main micro controller and the Teletext/EPG micro controller. See paragraph 5.2. Details on available software versions can be found in the chapter "Software Survey" of the publication "Product Survey - Colour Television". · "CODES xx xx xx xx xx xx" displayed on line 2

Indicates that the sleep timer is running. Complaints that may be caused by the activation of the sleep timer: · set displays "GOOD BYE" and switches to standby

To switch off the sleep timer:

16

A8.0E

5

Service Modes, DST, errors and protections
Auto standby switched the set off because: · · there was no ident signal > 15 minutes there was no remote control signal received or local key pressed for > 2 hours

1. press the top left button on the remote control until repeatedly until "SLEEP 0" is displayed in the middle of the screen. · "NOT TUNED" on line 5 of the CSM screen.

Indicates that the set is not receiving an "ident" signal on this channel / preset. Situations which can will result in the display of "NOT TUNED": · · · no or bad antenna signal; connect a proper antenna signal antenna not connected; connect the antenna no channel / preset is stored at this program number; go to the INSTALL menu and store a proper channel at this program number the tuner is faulty (in this case the CODES line will contain number 16); check the tuner and replace/repair if necessary

See chapter 8 for a description on the options to enable/disable auto standby Picture problems Picture too dark or too bright Press "Smart Picture" button on the remote control. In case the picture improves, increase / decrease the brightness value or increase / decrease the contrast value. The new "Personal Preference" value is automatically stored after 3 minutes After switching on the Customer Service Mode the picture is OK. Increase / decrease the brightness value or increase / decrease the contrast value. The new "Personal Preference" value is automatically stored after 3 minutes

·

Note: On some models, BLUE MUTE is displayed (if the BM option is ON) when no signal is received. · "LOCK" on line 6 of the CSM screen

White line around picture elements and text press "Smart Picture" button on the remote control. In case the picture improves, decrease the sharpness value. The new "Personal Preference" value is automatically stored after 3 minutes after switching on the Customer Service Mode the picture is OK. Decrease the sharpness value. The new "Personal Preference" value is automatically stored after 3 minutes

Indicates that all channels are locked except the selected channel. Complaint that may be caused by locked channels: 1. TV cannot be switched on from standby with the local keyboard buttons 2. "P+" and "P-" buttons on local keyboard do not function To disable the LOCK feature: 1. select "FEATURE" menu (with the Remote Control) 2. select "LOCK" (with the RC) 3. set to "OFF" · "SKIPPED" displayed on line 6 of the CSM screen

Snowy picture check the "NOT TUNED" section of the Customer Service Mode screen

Snowy picture and/or unstable picture Indicates that at least one channel is deleted as a preferred channels (by default, all channels are skipped. Note that "SKIPPED" will always be displayed in CSM unless all the channels are not skipped. A channel can be added as a selected channel to the list of preferred channels: 1. 2. 3. 4. · select "INSTALL" menu select "CHANNEL EDIT" select "ADD/DELETE" set to "ADD" with the left/right cursor keys "TIMER" displayed on line 7 of the CSM screen a scrambled or decoded signal is received

Black and white picture press "Smart Picture" button on the remote control. In case picture improves, increase the colour value. The new "Personal Preference" value is automatically stored after 3 minutes after switching on the Customer Service Mode the picture is OK. Increase the colour value. The new "Personal Preference" value is automatically stored after 3 minutes

Indicates that the on/off timer is running. Complaints that may be caused by the activation of the sleep timer; Without using the remote control of the local keybpard the set is switching: · on from standby: · to a different channel

Menu text not sharp enough press "Smart Picture" button on the remote control. In case the picture improves, decrease the contrast value. The new "Personal Preference" value is automatically stored after 3 minutes after switching on the Customer Service Mode the picture is OK. Decrease the contrast value. The new "Personal Preference" value is automatically stored after 3 minutes

To switch off the activation timer: · · · select "TIMER" in the "FEATURE" menu select "ACTIVATE' in the "TIMER" menu set to "OFF" with the left/right cursor keys

Sound problems No sound or sound too loud (after channel change / switching on) after switching on the Customer Service Mode the volume is OK. Increase / decrease the volume level. The new "Personal Preference" value is automatically stored after 3 minutes

5.6.2

Solving other problems
TV switched off or changed channel without any user action Set switches off after "TV SWITCHING OFF" was displayed

5

Service Modes, DST, errors and protections
Personal notes:

A8.0E

17

18

A8.0E

5

Service Modes, DST, errors and protections

Personal notes:

8
8

Alignments
General: the Service Default Mode (SDM) and Service Alignment Mode (SAM) are described in chapter 5.
Alignments

A8.0E

61

4n7

8.1

Alignment conditions
All electrical adjustments should be performed under the following conditions: · · · Warm-up time: 10 minutes The voltages and oscillograms are measured in relation to the tuner earth. Test probe: Ri > 10M Ci < 2,5 pF. · ·

G 82R
CL 76532030_002.AI 180698

Figure 8-2 : Measurement network
Connect an oscilloscope to pin 1 & 2 of 1145 Adjust coil 5145 for minimum output at 1145.

8.2
8.2.1

Electrical alignments
VG2
Rough alignment Using a pattern generator displaying a circle pattern, adjust the VG2 potmeter of LOT L5630 to obtain normal picture.

8.2.4

Audio demodulator (for Nicam LL' sets)
· Using a signal generator (eg. PM5326) supply a 100mV 38.9MHz signal via a 5,6 pF capacitor to pin 3 of connector Q11A. If the panel is aligned without the set then connect a +5V supply to pin 1 of connector Q11B and short pin 2 (SEL_IF_TRAP_MAIN) of connector Q11A to ground. Connect an oscilloscope (2ms/div) to pin 17 of IC7401 (TDA9810) and align coil L5402 for minimum amplitude.

· Fine adjustment Connect RF output of the pattern generator to antenna. Test pattern: blank pattern (blank screen on CRT). Set brightness, colour and contrast to minimum. Set the time base of the oscilloscope to 0.5ms with external triggering of the vertical pulse. Measure the black level pulse during the vertical flyback at the RGB cathodes of the CRT.

8.2.5

QSS demodulator (DK system sets)
· · · Tune the set to a particular station with NICAM DK transmission Connect an oscilloscope at pin 4 of M11B Adjust coil 5402 till minimum video content is reached at pin 4 of M11B

min.

max. 165V 0V Ref.
Figure 8-1: Black level pulse
86532031_007.AI 020698
86532031_008.AI 020698

Figure 8-3: Signal at L5402
8.3 Software alignments (Service Alignment Mode)
With the software alignments of the Service Alignment Mode the geometry, white tone and tuner (IF) can be aligned.

Adjust the highest of the three guns with the VG2 pot meter of the LOT to 165Vdc for 25", 28", 29" and 32", 150Vdc for 21" and 120Vdc for 24" picture tubes.

8.2.2

Focus
· · Set the smart picture setting to natural. Using a pattern generator displaying a crosshatch pattern, adjust the focus potmeter of LOT L5630 in such a way that the haze on the vertical lines at 2/3 from the left and right edges of the screen (just) disappears.

8.2.3

Alignment of IF sound trap (34.4MHz and 33.5MHz)
· · Disconnect jumper 4149 Inject a sinewave of 34.4MHz (PAL Multi) or 33.5MHz (/93) to anode of D6145 via a the following network:

62

A8.0E
SAM Menu

8

Alignments

PICTURE SOUND FEATURES INSTALL

SAM BRIGHTNESS COLOUR CONTRAST SHARPNESS COLOUR TEMP

MENU

1 nnnn ERR OP

2

MENU

3 5263-2-23 nn nn nnn nnn

4

5 SAM

LOAD NOW DON'T LOAD

A80EU1-1.0 nn nn nn nn nnn nnn nnn

nnn

nnn OB6 OB7 STORE AL AK nnn nnn ON OFF

RELOAD DEFAULT ERASE BUFFER OPTIONS ALIGNMENTS

MENU

6

MENU MENU

GEOMETRY GEOMETRY SW WHITE TONE TUNER BTSC SOUND

HORSHIFT nnn HORWIDTH nnn SERV.BLANKING VERSHIFT nnn VERWIDTH nnn

MENU

COLD

Rnnn

Gnnn

Bnnn

Only when HW option is present

TDA9855 LA SA WA AA nn nn nn nnn IF PLL IF PLL AGC AFA AFB nnn nnn nnn n n
CL 86532036_001.ai 260598

MENU

MENU

Figure 8-4: Service Alignments Mode screens and structure
8.3.1 Geometry alignments
The geometry alignments menu contains 11 items to align a correct picture geometry. In widescreen sets, the GEOMETRY SW is available for separate alignments of the superwide (panorama) mode. The geometry alignments are: HORWIDTH (horizontal width): align the picture width (*) HORWIDTH (horizontal width): align the picture width (*) SERV.BLANKING (service blanking): switch on/off the blanking of the lower half of the screen (can be used in combination with the vertical alignments) VERSHIFT (vertical shift): align the vertical centre of the picture to the vertical centre of the CRT VERHEIGHT (vertical width): align the picture height (other vertical alignments are NOT compensated)

VERSLOPE (Vertical slope): Align the vertical centre of the picture to the vertical centre of the CRT. (This is the first alignment to be performed of the vertical alignments) EW PARABO (E/W parabola): align straight vertical lines at the sides of the screen (*) EW TRAPEZ (E/W trapezium): align straight vertical lines in the middle of the screen (*) EW CORNER (E/W corner): align straight vertical lines in the corners of the screen (*) VER S-COR (vertical S-correction): align the vertical linearity, meaning that vertical intervals of a grid-pattern must be equal over the entire height. VERZOOM (vertical zoom): align the picture height (other vertical alignments are compensated)

8.3.2

White tone
In the white tone sub menu the colour values for the colour temperature values can be changed.

8

Alignments
The colour temperature mode (NORMAL, WARM , COLD) or the colour (R, G, B) can be selected with the RIGHT/LEFT cursor keys. The mode or value can be changed with the UP/ DOWN cursor keys. First the values for the NORMAL colour temperature should be selected. Than the offset values for the COLD and WARM mode can be selected. Note that the alignment values are nonlinear 0 represent the middle value (no offset difference) CF 1-127 represent a positive offset (127 is the maximum positive offset) 128-256 represent a negative offset (128 is the maximum negative offset) Negative <<< 128,129,..., 255,256, 0, 1,..., 126,127 >>> Positive (0 = no offset) CL CM CS DN DS

A8.0E Table 8-1
Option AK Functionality

63

Auto Standby (after 2 hours of no activity via RC or keyboard) Auto Standby when 15 minutes no picture >1 AV Source; default to OFF (reserved) must be always ON when a PIP panel is present Child Lock (in FEATURE menu) Compress 16:9 Customer Service Mode Dynamic Noise Reduction (in FEATURE menu) Preset downloading with Dealer Service Tool possible Expand 14:9 (via RC SCREEN MODE button) Hospitality Mode Headphone control (in AUDIO menu) Contrast Plus item (in FEATURE menu) Incredible Picture (Histogram must be present when ON) (RESERVED) NTSC (playback only) Nicam sound (ON = Nicam + 2CS; OFF = 2CS only) Smart Clock / Timer Number of AV source selections (ON = 4 AV sources; OFF = 3 AV sources) Incredible Surround sound Auto Standby after auto start/2 hours no RC5 response System: EW (Western Europe), EE (Eastern Europe), EM (Middle Europe) Widescreen (Service) menu controls

AN AV

8.3.3

Tuner
IF alignment; The IF PLL and IF PLL L' alignments are done automatically by the TDA8844. Changing the value has no effect AGC alignment; With the AGC alignment, the automatic gain control crossover can be aligned. Adapt this setting in case the signal of a strong local transmitter is distorted. AFA and AFB display the status of the automatic frequency control. Since this is automatically adjusted, these values do not have to be used. EX HO HP IM IP

PB SB

8.4

Options
Opt ions are used to control the presence / absence of certain features and hardware. There are two ways to change the option settings. The various option configurations and the descriptions of the two character-codes are explained in chapter 8 of the manual. Changing a single option An option can be selected with the MENU UP/DOWN keys and its setting can be changed with the MENU LEFT/RIGHT keys Changing multiple options by changing option byte values Option bytes make it possible to set very fast all options. An option byte represents a number of different options. All options of the A8 are controlled via 7 option bytes. Select the option byte (OB1, OB2, OB3, OB4, OB5, OB6 or OB7) and key in the new value. Changes in the options and option bytes settings are saved by selecting STORE and pressing the MENU RIGHT key. All changes are disregarded when the OPTION submenu is left without using the STORE command. Some changed will only take affect after the set has been switched OFF and ON with the mains switch (cold start).

SC SO

SR ST

SY

WS

8.4.2

Option bits/bytes
Option bytes OB1 bits 8, 7, ..., 1: AK, AN, AV, DS, CM, CS, EX, HO OB2 bits 8, 7, ..., 1: CL, SC, SO, ST, WS, CF, IP, IM OB3 bits 8, 7, ..., 1: DN, SB, HP, PB, (res), (res), (res), (res) OB4 bits 8, 7, ..., 1: (reserved) OB5 bits 8, 7, ..., 1: (reserved) OB6 bits 8, 7, ..., 1: (reserved) OB7 bits 8, 7, ..., 1: (res), (res), (res), (res), SY, SY, SY, SY

8.4.1

List of options
Unless otherwise stated ON means present (or yes), OFF means not present (or no)

An option byte value is calculated in the following way: value "option bit 1" x 1 =......... value "option bit 2" x 2 =......... value "option bit 3" x 4 =......... value "option bit 4" x 8 =......... value "option bit 5" x 16 =......... value "option bit 6" x 32 =.........

64

A8.0E

8

Alignments

value "option bit 7" x 64 =......... value "option bit 8" x 128 =.........+ value "option byte" =..........

9
9.1
9

Circuit description
Training Manual
Circuit description

A8.0E

65

The A8 circuitry is described in detail in the A8 Training Manual. In the Training Manual, the following topics are covered: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Introduction Mechanical Control Power supply Video processing Synchronisation Audio processing Audio output stage Horizontal Deflection Vertical Deflection Teletext and on screen display Wide screen view modes

The order codes of the A8.0E Training Manual are: English: 4822 727 21648 Dutch: 4822 727 21649 German: 4822 727 21651 French: 4822 727 21652 Italian: 4822 727 21653 Spanish: 4822 727 21654

66
10 Directions for use

A8.0E

10 Directions for use

10 Directions for use

A8.0E

67

68

A8.0E

10 Directions for use

10 Directions for use

A8.0E

69

70

A8.0E

10 Directions for use

10 Directions for use

A8.0E

71

72
+13V
11 List of abbreviations

A8.0E

11 List of abbreviations
LED MUTE P2 LED driving signal MUTE switching signal for sub woofer Together with D2_P1 connection form a parallel network (of resistor & capacitor) across the S-correction capacitor of 2624. This is used on widescreen set Panorama switching signal from mP Horizontal phase correction signal for the BIMOS Horizontal phase correction signal from line output stage Power On Reset signal for mP Power On Reset signal for mP on the TXT/ EPG panel Positive or Negative modulation of Quasi-Split Sound Protection switching signal to the mP. It is connected with 3 protection circuits of EW protection, vertical protection and x-ray protection High beam current protection switching signal to the BIMOS pin 50 Red insert signal to TDA8844 Red signal for teletext or on-screen display R-Y input signal to TDA8844 R-Y output signal from TDA8844 RC5 signal from infer-red receiver Left audio source from rear input cinch 1 Right audio source from rear input cinch 1 Left audio source from rear input cinch 2 Right audio source from rear input cinch 2 Red, Green and Blue suppression of main picture signal RGB switch off DC voltage to the RGB amplifier. It only works during switching off the TV set Sound grounding for output stage I2C clock line I2C data line Switching signal to suppress 34.4 MHz on PAL/multi set and to select 4.5 MHz sound trap Incredible sound on/off switching signal Switching signal of external Y/CVBS source from rear I/O or side AV Switching signal of monitor out source from CVBS_TERR or CVBS_MON Sound Intermediate Frequency Status signal from SCART 1 Status signal from SCART 2 Status signal from headphone socket Switching signal to YC adder circuit Sub woofer audio input System selection for PAL/M/BG/N or NTSCM System selection for PAL/M/BG/N or NTSC-M Vertical reference signal for OSD Inverted Vertical signal +140V power supply for line output stage +140V derive from VBAT Negative vertical drive signal from BIMOS pin 47 Positive vertical drive signal from BIMOS pin 46 External Luminance or composite video baseband signal External Luminance or composite video baseband signal from Side AV

+13V_+20V

+13V_SCAVEM +14V +15V +200V +33V +5V +5V_STBY +5VA +5VD +5VSOUND +8V +8VA +8VB +8VSOUND -13V AMP_MUTE1 B_IN B_TXT_OSD B_Y_IN B_Y_OUT BASEBAND_AUDIO C_EXT C_FRNT C_REAR CU1/2/3 CVBS+SIF_MAIN CVBS_INT CVBS_MON CVBS_TERR D1 D2_P1 DEGAUS E_W_DRIVE EHT_INFO EXT_R/L FBL_TXT_OSD FBL1/2 FF FFBL_EXT FRNT_CNTRL G_IN G_TXT_OSD GND_LOT H_DRIVE H_NEG HFB IF1 L/R_AUDIO_IN L/R_FRNT L/R_HP_IN L/R_HP_OUT L/R_INT L/R_MON

+13V derived from LOT. It also used for disable the +5V supply +13V or +20V (picture tube dependent) supply derived from the LOT to the vertical deflection output stage +13V supply for the SCAVEM circuit in the CRT panel +14V for the RGB kill circuit +15V power supply for sound output stage +180V supply voltage for the RGB amplifier +33V for tuning voltage, derived from VBAT +5V power supply for small signal circuit +5V standby voltage Derived from +5V via 5100 Derived from +5V_STBY via 5090 Derived from +5V via 5430 +8V power supply for small signal circuit Derived from +8V via 3250 Derived from +8V via 3162 +8V source regulated from +13V -13V supply to the vertical deflection output stage Switching signal for muting sound amplifier circuitry Blue insert signal TDA8844 Blue signal for teletext or on-screen display B-Y input signal to TDA8844 B-Y output signal from TDA8844 Baseband audio out signal (mono set) External chrominance signal External chrominance signal from Side AV External chrominance signal from IO rear Copper track 1, 2 or 3. Not meaningful to service Main composite video baseband signal plus sound IF signal Internal source composite baseband signal Composite video baseband signal for monitor (WYSIWYG) Composite video baseband terrestrial signal for I/O SCART Connection of anode of 6621 to the modulating diode of EW panel Connection of anode of Mannheim-effect diode 6626 and the bridge coil on EW panel Degaussing switching signal East West Drive signal for EW panel EHT info related to the beam current Left/right audio external source to TDA9855 (BTSC) Fast blanking signal for teletext or on-screen display Fast blanking signals for contrast reduction OSD Filament supply voltage External fast blanking signal from I/O SCART Top control button signal Green insert signal to TDA8844 Green signal for teletext or on-screen display Return path of filament current Horizontal drive signal Inverted Horizontal signal Horizontal flyback signal Intermediate frequency from tuner Left/Right audio input for sound amplifier Left/Right external audio source from sideAV Left/Right audio input for headphone buffer Left/Right audio output for headphone Left/Right audio output for the monitor of tuner received sound Left/Right audio output for the monitor (WYSIWYG)

PAN_SWITCH PHASE_CORRECTI ON PHASE_CORRECTI ON POR POR2 POSNEG_QSS PROT_E_W_VERT

PROT_IBEAM_EHT_ INFO R_IN R_TXT_OSD R_Y_IN R_Y_OUT RC5 REAR1_L REAR1_R REAR2_L REAR2_R RGB_KILL RGB_SW_OFF

S_GND SCL SDA SEL_IF_TRAP_MAIN

SEL_INCRED SEL_MAIN_FRNT_R R SEL_MAIN_R1R2 SOUND_IF STAT_EXT1 STAT_EXT2 STAT_HP SVHS_MODE SW_AUDIO_IN SYS1 SYS2 V V_NEG VBAT VBAT_2 = VBAT VDRIVE_NEG VDRIVE_POS Y_CVBS_EXT Y_CVBS_FRNT

11 List of abbreviations
Y_CVBS_MON Y_CVBS_REAR Y_IN Y_OUT Monitor out signal of luminance or composite video baseband signal External composite video baseband signal or luminance signal source from rear IO Luminance input signal from TDA8844 Luminance output signal from TDA8844

A8.0E

73

74 [A] Chassis
12 Spare parts list

A8.0E

12 Spare parts list
2292 2293 2294 2322 2322 2350 2351 2352 2439 2445 2446 2447 2448 2450 2451 2452 2453 2456 2457 2458 2460 2462 2463 2463 2464 2464 2465 2466 2467 2468 2472 2473 2474 2475 2476 2481 2482 2483 2484 2488 2489 2491 2492 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2510 2521 2522 2550 2551 2552 2553 2555 2556 2565 2566 2567 2568 2569 2570 2571 2572 2600 2601 2602 2605 2611 2612 2618 2618 2621 2624 2624 2625 2625 2625 2627 2629 2629 2629 2631 2634 2634 2634 2634 2635 2646 2647 2650 2650 2650 2656 2661 2662 2662 4822 126 12944 4822 126 12944 4822 126 12944 4822 124 40246 4822 124 41579 4822 124 40433 4822 126 10002 4822 126 10002 4822 124 22263 4822 124 41579 4822 126 10002 5322 126 10511 4822 126 10002 5322 126 10511 5322 126 10511 4822 126 10002 4822 126 10002 5322 122 32286 5322 122 32286 5322 122 32331 4822 126 13692 4822 126 13692 4822 126 13692 5322 122 32269 5322 122 32448 5322 122 32658 4822 126 10002 4822 124 40433 4822 126 10002 4822 124 41579 4822 126 13473 4822 126 13473 4822 126 13473 4822 122 33891 4822 122 33891 4822 126 13473 4822 126 13473 4822 122 33891 4822 122 33891 4822 122 33532 4822 122 33532 4822 126 10002 4822 124 40246 4822 124 41579 4822 126 10002 4822 124 41579 5322 126 10511 5322 126 10511 5322 126 10511 5322 126 10511 4822 126 13473 4822 126 13473 4822 126 13473 4822 126 13473 4822 126 13473 4822 126 13473 4822 126 13473 4822 126 13482 4822 126 13482 4822 126 10002 4822 124 41579 5322 122 34123 5322 122 34123 5322 122 32654 5322 122 32654 4822 126 10002 4822 126 10002 4822 126 13482 4822 126 13482 4822 124 40433 4822 124 40433 4822 124 11572 4822 122 31177 5322 126 10223 4822 122 31175 4822 121 43526 4822 121 43526 4822 126 13451 4822 126 14237 4822 122 31177 4822 124 41741 4822 124 42404 4822 121 70545 4822 121 70617 4822 121 70618 4822 124 40255 4822 121 51612 4822 126 14096 4822 126 14097 4822 121 51252 4822 126 13862 4822 126 13865 4822 126 14053 4822 126 14237 4822 121 70618 4822 126 10002 4822 126 12944 4822 121 40472 4822 121 40518 5322 121 41763 4822 124 11508 4822 124 11878 4822 121 41857 4822 121 70676 47nF 10% 50V 47nF 10% 50V 47nF 10% 50V 4.7µF 20% 63V 10µF 20% 50V 47µF 20% 25V 100nF 20% 25V 100nF 20% 25V 220µF 20% 25V 10µF 20% 50V 100nF 20% 25V 1nF 5% 50V 100nF 20% 25V 1nF 5% 50V 1nF 5% 50V 100nF 20% 25V 100nF 20% 25V 3.3pF 5% 50V 3.3pF 5% 50V 1nF 10% 100V 47pF 1% 63V 47pF 1% 63V 47pF 1% 63V 6.8pF 5% 50V 10pF 5% 50V 22pF 5% 50V 100nF 20% 25V 47µF 20% 25V 100nF 20% 25V 10µF 20% 50V 220nF 50V 220nF 50V 220nF 50V 3.3nF 10% 63V 3.3nF 10% 63V 220nF 50V 220nF 50V 3.3nF 10% 63V 3.3nF 10% 63V 3.3nF 5% 50V 3.3nF 5% 50V 100nF 20% 25V 4.7µF 20% 63V 10µF 20% 50V 100nF 20% 25V 10µF 20% 50V 1nF 5% 50V 1nF 5% 50V 1nF 5% 50V 1nF 5% 50V 220nF 50V 220nF 50V 220nF 50V 220nF 50V 220nF 50V 220nF 50V 220nF 50V 470nF 16V 470nF 16V 100nF 20% 25V 10µF 20% 50V 1nF 10% 50V 1nF 10% 50V 22nF 10% 63V 22nF 10% 63V 100nF 20% 25V 100nF 20% 25V 470nF 16V 470nF 16V 47µF 20% 25V 47µF 20% 25V 47µF 20% 160V 470pF 10% 500V 4.7nF 10% 63V 1nF 10% 500V 47nF 5% 250V 47nF 5% 250V 2.2nF 10% 2KV 470pF 10% 2KV 470pF 10% 500V 2.2µF 20% 350V 4.7µF 20% 250V 7.5nF 5% 1.6KV 10nF 5% 1.6KV 12nF 5% 1600V 100µF 20% 63V 330nF 5% 250V 560nF 5% 250V 680nF 5% 250V 470nF 5% 63V 1.5nF 10% 2KV 390pF 10% 2KV 1nF 10% 2KV 470pF 10% 2KV 12nF 5% 1600V 100nF 20% 25V 47nF 10% 50V 150nF 10% 250V 100nF 10% 250V 33nF 10% 630V 250V. 22µF 20% 4700µF 16V. 10nF 5% 250V 27pF 10% 50V 2664 2700 2705 2709 2710 2729 2730 2731 2732 2733 2735 2736 2742 2743 2746 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2830 2838 2840 2843 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2904 2905 2906 2908 2912 2913 2914 2915 2916 2917 2918 2919 2920 2922 2923 2925 2931 2935 2937 2938 2940 2945 2946 2947 2950 2975 2987 4822 124 80791 5322 121 42386 4822 122 33575 5322 122 32268 5322 122 32268 4822 124 11571 5322 121 42386 4822 124 40255 5322 121 42386 4822 121 42408 4822 124 41576 5322 121 42386 5322 121 42386 4822 124 81029 4822 126 13482 4822 126 12944 4822 122 33575 5322 126 10511 4822 126 13486 4822 126 13473 4822 126 10002 4822 122 33175 5322 126 10223 5322 122 32531 4822 124 40242 5322 126 10511 5322 126 10511 5322 121 42386 4822 121 51473 4822 126 14053 4822 124 11565 4822 126 13451 4822 124 81029 5322 122 32658 4822 126 13689 4822 126 13486 4822 121 43823 5322 122 32269 4822 126 13482 4822 122 33216 5322 122 32531 4822 121 40334 5322 122 32654 4822 124 40764 4822 126 11308 4822 121 40516 4822 126 13693 4822 126 13451 4822 126 13451 4822 124 41748 4822 121 70619 4822 124 40433 4822 126 13862 4822 121 10779 5322 122 32311 4822 126 14237 4822 124 11572 4822 122 31175 4822 124 81146 4822 121 41857 4822 122 31175 4822 124 80215 4822 124 81168 4822 124 40433 4822 126 13836 4822 124 41579 4822 124 41579 4822 126 10002 4822 126 14456 4822 126 13196 5322 122 34099 4822 126 13061 4822 121 10684 4822 126 14049 470µF 16