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SERVICE MANUAL
PT92 CHASSIS
Modification reserved
PT-92 Chassis Service Manual
CONTENTS
PAGE
1.Technical Data 2. Recommendation for service repairs 3. Handling of MOS chip components 4. X-Ray radiation precaution 5. Service Menu 6. Specification of the connector (Euroscart) 7. Component descriptions 8. Exploded view 9. Block Diagrams 10. Fault tracing diagram-power supply 11. Power Supply circuit diagram 12. Troubleshooting guide for main PCB 13. Descriptions of the integrated circuits
TDA16846 TDA935X TDA9875A TDA9870A TDA24C16 TDA8351 TDA8356 TDA2616 TDA2615 TDA7056 TDA7057AQ TDA7050 TDA6107Q TCDT1100 TDA9830 TDA7710 BU2508AF BU508DF SPP03N60S5 SPP04N60S5 SMPS IC UOC IC TV SOUND IC (STEREO) TV SOUND IC (G. STEREO) EEPROM VERTICAL IC (110O) VERTICAL IC (90O) STEREO AUDIO AMPLIFIER (110O) STEREO AUDIO AMPLIFIER (90O) MONO AUDIO AMPLIFIER (90O) HP AMPLIFIER HP AMPLIFIER VIDEO OUTPUT AMPLIFIER OPTO COUPLER TV SOUND AM DEMODULATOR DOLBY PRO LOGIC SURROUND HORIZONTAL TRANSISTOR (110O) HORIZONTAL TRANSISTOR (90O) SMPS MOSFET (90O) SMPS MOSFET (110O)
4 5 5 5 6 9 10 11 14 17 18 19 20 24 31 38 48 50 54 58 60 63 65 67 70 72 74 78 83 86 89 91 93 96 97 113
14. 15. 16. 17.
Dolby and secam L mono board and circuits diagrams Oscilloscope shapes Chassis replacement part list Main Circuit
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PT-92 Chassis Service Manual
TECHNICAL DATA
CRT PANEL Visible Picture Deflection Angle Vertical Frequency Horizontal Frequency
47 cm / 50 cm / 66 cm 90o / 110o 50Hz 15.625Hz
ELECTRONIC
Program Number Teletext Tuner TV System Music Power 100+AV Flof text Cable tuner - 8 MHz spacing for Hyper Band European CCIR system 110o 2x8 Watt Rms 10% distortion 90o 2x4 Watt Rms 10% distortion
CONNECTIONS
Euro AV Socket Include
MAIN STAGE
Mains Voltage Mains Frequency Power Consumption In Stby Mode 165-260VAC 50Hz 110o 126W; 90o 75W; 110o 8 Watt 90o 5 Watt
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PT-92 Chassis Service Manual
RECOMMENDATION FOR SERVICE REPAIRS
1- Use only original spare parts. Only use components with the same specifications for replacement. 2- Original fuse value only should be used. 3- Main leads and connecting leads should be checked for external damage before connection. Check the insulation. 4- Parts contributing to the safety of the product must not be damaged or obviously unsuitable. This is valid especially for insulators and insulating parts. 5- Thermally loaded solder pads are to be sucked off and re-soldered. 6- Ensure that the ventilation slots are not obstructed. 7- Potentials as high as 25 KV are present when this receiver is operating. Operation of the receiver outside the cabinet or with back cover removed involve a shock hazard from the receiver. Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when working on high voltage equipment. Perfectly discharge the high potential of the picture tube before handling the tube. The picture tube is highly evacuated and if broken. Glass fragments will be violently expelled. Always discharge the picture tube anode to the receiver chassis to keep of the shock hazard before removing the anode cap. 8- Keep wire away from the high voltage or high temperature components. 9- When replacing a wattage resistor in circuit board, keep the resistor 10 mm away from circuit board.
HANDLING OF MOS CHIP COMPONENTS
MOS circuit requires special attention with regard to static charges. Static charges may occur with any highly insulating plastics and can be transferred to persons wearing clothes and shoes made of synthetic materials. Protective circuits on the inputs and outputs of mos circuits give protection to a limited extend only due to time of reaction. Please observe the following instructions to protect the components against damage from static charges. 1- Keep mos components in conductive package until they are used. Most components must never be stored in styropor materials or plastic magazines. 2- Persons have to rid themselves of electrostatic charges by touching MOS components. 3- Hold the component by the body touching the terminals. 4- Use only grounded instruments for testing and processing purposes. 5- Remove or connect MOS ICs when operating voltage is disconnected.
X-RAY RADIATION PRECAUTION
1- Excessive high voltage can be produce potentially hazardous X-RAY radiation. To avoid such hazard, the high voltage must not be above the specified limit. The nominal value of the high voltage of this receiver is 25KV at zero beam current (minimum brightness) under 220V AC power source. The high voltage must not under any circumstance, exceed 30KV. It is recommended the reading of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter. 2- The primary source of X-RAY radiation in this TV receiver is the picture tube. For continued X-RAY radiation protection, the replacement tube must be exactly the same type tube as specified in the part list.
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PT-92 Chassis Service Manual
SERVICE MENU
The service menu is entered by pressing the key on the RC and VOLUME-DOWN key on the TV simultaneously when the TV is in TV- mode. The service menu is left by pressing the key. When entering the service mode the first menu item is IF (selection of normal IF). Next items can be selected using the keys and . The value of each item can be changed using the keys and . The item values are displayed as decimal values, except for the tuner-band-selection, BITS and option items. They are displayed as hexa-decimal values. All values are stored in non-volatile memory when the service menu is left. The "INIT CTV832U" item initializes the NVM: It clears all names and tuning information of all programs and writes default values for the service alignments and preset values in NVM. While doing so, the OSD displays "BUSY". When the initialization is finished, the message "READY" is written on the screen.
Item IF IFL1 HP HB EW PW UCP LCP TC HP4:3 HB4:3 EW4:3 PW4:3 UCP4:3 LCP4:3 TC4:3 HS VS VA SC VSD VSH VX BLR BLG WPR WPG WPB Ys Yn YP
DefauIt 38.9 33.9 31 31 37 18 13 13 28 31 31 45 15 35 25 31 31 31 31 31 off 31 25 7 7 31 31 31 15 8 0
Explanation IF selection (58.8, 45.8, 38.9 or 38.00 MHz) IF for SECAM-L1 selection (33.4 or 33.9 MHz) Horizontal parallelogram Horizontal bow East-west Width for picture setting 16:9 East-west Parabola for picture setting 16:9 East-west Upper Corner parabola for picture setting 16:9 East-west Lower Corner parabola for picture setting 16:9 East-west Trapezium for picture setting 16:9 Horizontal parallelogram for picture setting 4:3 Horizontal bow for picture setting 4:3 East-west Width for picture setting 4:3 East-west Parabola for picture setting 4:3 East-west Upper Corner parabola for picture setting 4:3 East-west Lower Corner parabola for picture setting 4:3 East-west Trapezium for picture setting 4:3 Horizontal Shift Vertical Slope Vertical Amplitude S-Correction Vertical Scan Disable Vertical Shift Vertical zoom (East-west only) Black Level Red Black Level Green White point correction Red White point correction Green White point correction Blue Y-delay adjustment for SECAM Y-delay adjustment for NTSC Y-delay adjustment for PAL 6
PT-92 Chassis Service Manual
Yo AGC CL Bits Bits1
Y-delay adjustment for external sources AGC take over Cathode drive level (ACL=0; FCO= 0; SVO= 0; HP2= 0; FSL= 0; OSO= 0) (FFI= 0; TV= 0; AV-1= 0; AV-2= 0; AV-2S= 0; AV-3= 0; AV-3S= 0; AV = 0) OptByte1 (Default=E3) PAL-BG = Selection PAL-BG (1) PAL-DK = Selection PAL-DK (1) PAL-I = Selection PAL-I (0) PAL-M = Selection PAL-M (0) PAL-N = Selection PAL-N (0) NTSC-M = Selection NTSC-M (1) NTSC-443 = Selection NTSC-443 (1) SECAM-BG = Selection SECAM-BG (1) *(1) Selected, (0) Not Selected OptByte2 (Default=07) SECAM-DK = Selection SECAM-DK (1) FRANCE = Selection FRANCE (1) Logo = Enable/Disable Logo (1/0) PalBG Scr = When the PalBG Scr selected, TV searches only PalBG. Otherwise it searches all. (0) AV2 = Selection AV2 (0) *(1) Selected, (0) Not Selected OptByte3 (Default=E8) HP = Selection HP (0) Volbar = Selection Volbar (1) Subwof = Selection Subwof (0) Presets = Selection Presets (1) Lock = Selection Lock (1) Hotel = When the Hotel mode selected, It's impossible to enter menu settings.lt selects the Hotel mode. (1) *(1) Selected, (0) Not Selected OptByte4 (Default=B8) 16:9 = Set 16:9 mode active (1) 110 = Selection 110/90 Tube (1/0) Hpol = Default (0) Vpol = DefauIt (0) Field = Default (1) FE-Out = Default (1) Sw-on = When the power on the TV, it Enables or Disables Standby Mode. (1/0) Vg-Check = Default (1) *(1) Selected, (0) Not Selected OptByte5 (Default=09) Clock = Enable/Disable Clock Menu (1) AM/PM = Default (0) AVL = Auto Volume Level (1) 1-norma = Default (0) *(1) Selected, (0) Not Selected OptByte6 (Default=00) UOC-J = Default (0) ignrSUP = Default (0) ignrNDF = Default (0) *(1) Selected, (0) Not Selected
0 4 4 00 00
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PT-92 Chassis Service Manual
TSL TEL TSM TEM TSH TEH TBL TBN TBH
45 118 118 400 400 863 03 06 85
Start frequency of the low-band in MHz End frequency of the low-band Start frequency of the mid-band End frequency of the mid-band Start frequency of the high-band End frequency of the high-band hex Value needed for switching to the low-band hex Value needed for switching to the mid-band hex Value needed for switching to the high-band
16:9 / 4:3 Adjustment
The CTV832U software uses two sets of parameters for the registers HP (horizontal parallelogram), HB (horizontal bow), EW (EW width), PW (parabola/width), UCP (upper corner parabola), LCP (lower corner parabola) and IC (EW trapezium). They occur in the service menu for 16:9 screen with the listed abbreviations. For the 4:3 screen there is a second set of these registers. They occur in the service menu with the extension `4:3' (i.e. HP4:3, HB4:3,...). Each register set must be adjusted under the right conditions i.e. the 16:9 settings are adjusted with a 16:9 picture the 4:3 settings with a 4:3 picture. The inenu items EW, PW, UCP, LCP, TC, HP4:3, HB4:3,... TC4:3 and VX will only be in the service menu if the option 16:9 is set in 4 th option byte.
TUNER PARAMETER IN SERVICE AND DEFINITION TSL TEL TSM TEM TSH TEH TBL TBN TBH Start frequency of the low-band in MHz End frequency of the low-band Start frequency of the mid-band End frequency of the mid-band Start frequency of the high-band End frequency of the high-band hex Value needed for switching to the low-band hex Value needed for switching to the mid-band hex Value needed for switching to the high-band
PHILIPS 45 160 160 440 440 863 A1 92 34
OREGA 45 118 118 400 400 865 03 06 85
TEMIC 45 150 150 440 440 865 01 02 04
SAMSUNG 45 150 150 425 425 865 01 02 08
ALPS 45 180 180 465 465 900 01 02 0C
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PT-92 Chassis Service Manual
SPECIFICATIONS OF THE CONNECTOR
(EURO SCART)
I- Audio output 1. right channel 0.5 VRMS/10k 0 7- RGB input, blue (B) 8- Switch signal video (status) 9- GND 10- Reserved for clock signals (not connected) 11- RGB input, green (G) 12- Reserved for remote control (not connected) 13- GND 14- GND switch signal RGB 15- RGB input, red (R) 16- Switch signal RGB 17- GND (video) 18- GND19- Video output 1 Vpp/75 ohm 20- Video input 1 Vpp/75 ohm 21- Shield
1
3
5
7
9
11 13 15 17 19 21
2
4
6
8 10 12 14 16 18 20
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PT-92 Chassis Service Manual
POWER CORD
SAW FILTER
IR SENSOR
VOLTAGE REGULATOR
ON/OFF SWITCH
COMPONENT DESCRIPTIONS
LINE FILTER PTC NPN TRANSISTOR PNP TRANSISTOR CERAMIC FILTER COIL LINEARITY COIL FUSIBLE RESISTOR IW METAL OXIDE RESISTOR 1/2W METAL OXIDE RESISTOR 1/4 OR 1/6W CARBON FILM RESISTOR CERAMIC CAPACITOR /POLYESTER CAPACITOR ELECTROLYTIC CAPACITOR DIODE ZENER DIODE SWITCH JUMPER NET (INPUT) NET (OUTPUT) TACT SWITCH 10 10
11
1- 28" MEGA CABINET 2- 28" FST CRT 3- CRT SCREW Ø 7x30 4- ACRYLIC WINDOW 5- MULTIPLE BUTTON 6- MULTIPLE BUTTON SCREW Ø 2.9x9.5 7- LOGO PCB 8- LOGO ACR. 9- LOGO 10- CRT PANEL STOPER 11- AV PCB 12- AV PCB HOLDER 13- AV HOLDER SCREW 14- ON-OFF BUTTON 15- FRAME MAIN PCB 16- MAIN PCB 17- CRT PCB 18- POWER CABLE 19- POWER CABLE HOLDER 20- SPEAKER 21- SPEAKER SCREW 22- TWEETER 23- TWEETER SCREW 24- BACK COWER 25- BACK COWER SCREW 26- BACK COWER LABEL 27- FRONT FRAME
PT-92 Chassis Service Manual
28" MEGA CTV
PT-92 Chassis Service Manual
12
1- 21" MEGA CABINET 2- ACRYLIC WINDOW 21" CRT 3- 21" CRT 4- CRT SCREW Ø 7x30 5- SPEAKER 6- SPEAKER SCREW Ø 3.9x10 7- CRT RUBBER 8- MULTIPLE BUTTON 9- MULTIPLE BUTTON SCREW Ø 2.9x9.5 10- AV PCB 11- AV PCB HOLDER 12- AV HOLDER SCREW Ø 2.9x9.5 13- POWER CABLE HOLDER 14- POWER CABLE 15- LOGO PCB 16- LOGO ACR. 17- LOGO 18- MAIN PCB 19- ON-OFF BUTTON 20- CRT PCB 21- BACK COWER 22- BACK COWER SCREW Ø 3.9x19 23- BACK COWER LABEL 24- FRONT FRAME
21" MEGA CTV
13
1- 20" MEGA CABINET 2- ACRYLIC WINDOW 20" CRT 3- 20" CRT 4- CRT SCREW Ø 7x30 5- SPEAKER 6- SPEAKER SCREW Ø 3.9x10 7- CRT RUBBER 8- MULTIPLE BUTTON 9- MULTIPLE BUTTON SCREW Ø 2.9x9.5 10- AV PCB 11- AV PCB HOLDER 12- AV HOLDER SCREW Ø 2.9x9.5 13- POWER CABLE HOLDER 14- POWER CABLE 15- LOGO PCB 16- LOGO ACR. 17- LOGO 18- MAIN PCB 19- ON-OFF BUTTON 20- CRT PCB 21- BACK COWER 22- BACK COWER SCREW Ø 3.9x19 23- BACK COWER LABEL 24- FRONT FRAME
PT-92 Chassis Service Manual
20" MEGA CTV
PT-92 Chassis Service Manual
PT92 110o STEREO CHASSIS
I2C UV1316 PLL Tuner
STEREO I2C TDA2616 TDA9870A/75A Sound Processor Sound Amplifier R L
AGC SAV Filter
Scarts L/R
Sub
IF RGB Iblack Sound Trap TDA935X/6X/8X Vdrive PAL/SECAM/NTSC Externals L/R TV Signal Proc. Teletext Decoder µ-Controller RGB Processing Guard TDA8351 DC Vertical Amplifier Beam Current BU2508AF Hdrive CVBS Flyback Horizontal Deflection & EHT E/W (110o) RGB 12.000 Hor. EHT Ver. TDA6107Q Triple RGB Output Amplifier 110o
Supply TDA16846 I2C PCA8521 RC-5 Transmitter 16K EEPROM SMPS
Degaussing Mains 220
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PT-92 Chassis Service Manual
PT92 90o STEREO CHASSIS
I2C UV1316 PLL Tuner
STEREO I2C TDA2615 TDA9870A/75A Sound Processor Sound Amplifier R L
AGC SAV Filter
Scarts L/R
Sub
IF RGB TDA6107Q Iblack Sound Trap TDA935X/6X/8X Vdrive PAL/SECAM/NTSC Externals L/R TV Signal Proc. Teletext Decoder µ-Controller RGB Processing Guard TDA8356 DC Vertical Amplifier Beam Current Hdrive CVBS Flyback RGB 12.000 Ver. Triple RGB Output Amplifier 90o
BU508DF Horizontal Deflection & EHT
Hor. EHT
Supply TDA16846 IC PCA8521 RC-5 Transmitter 16K EEPROM
2
Degaussing Mains 220
SMPS
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PT-92 Chassis Service Manual
PT92 90o MONO CHASSIS
I2C UV1316 PLL Tuner
AGC SAV Filter Audio Out IF RGB Iblack Sound Trap TDA935X/6X/8X Vdrive PAL/SECAM/NTSC Externals Mono CVBS Flyback RGB 12.000 Degaussing TDA16846 I2C PCA8521 RC-5 Transmitter 16K EEPROM SMPS Mains 220 TV Signal Proc. Teletext Decoder µ-Controller RGB Processing Guard TDA8356 DC Vertical Amplifier Beam Current Hdrive Ver. TDA6107Q Triple RGB Output Amplifier 90o TDA7056A Sound Amplifier
Mono
BU508DF Horizontal Deflection & EHT
Hor. EHT
Supply
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PT-92 Chassis Service Manual
FAULT TRACING DIAGRAM-POWER SUPPLY
Switched mode power supply defective,+145V is missing or level is wrong
DP 01 ÷ 04 CP 01 ÷ 04 CP 06, TP01
YES
Fuse F1 defective
NO NO
RP 07, RP 05 open and short circuit
Voltage at drain TP 01
YES
Voltage at IP 01 PIN 11 < 1V
YES RP 06
NO YES RP 11, DP 07
Start-up voltage (6) PIN 14 < 8V
NO YES TP 01
Start-up voltage varies ca. 8V
NO
IP 01
Measure +145 V
NO VAP 1, RP 03
+145V adjustable with VAP 01
YES
Control range of switched-mode power supply
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PT-92 Chassis Service Manual
18
POWER SUPPLY
PT-92 Chassis Service Manual
TROUBLESHOOTING GUIDE FOR MAIN PCB
TROUBLE
No color Horizontal linearity Horizontal size Flue picture Dark picture Noise picture Interference No sound Sound distortion Memory No video on the SCART No audio on the SCART No picture CV37, CV38, XV01 LD02, RD20, DD06
CHECK POINTS
+B voltage, CD18, CD20, CD27, CD08, TV06 RD17, RD06, RD62, R001, Focus adjust Screen adjust, EHT voltage TU01, AGC adjust, If adjust TV01, TV04, TU01 IA50, IA51, IA01, DP17, DP12, RA51, X301, I302, IV01 I302, IC01, L304, CA07, CA06, RA06, RA07, IA01, IA50, IA51 IC02, IV01, TC10 IV01, TE01, TE04 I302, TV03 TD01, TD02, DD01, TD04, DD03, DD04, ID50, RD56, IV01
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PT-92 Chassis Service Manual
TDA16846
Controller For Switch Mode Power Supplies
The TDA16846 is suited for TV-, VCR-sets and SAT receivers. It also can be good used in PC monitors. The TDA 16847 is identical with TDA16846 but has an additional power measurement output (pin 8) which can be used a Temporary High Power Circuit.
Pin Configuration (top view)
DTC PCS RZI SRC OCI FC2 SYN
1 2 3 4 5 6 7
U
14 13 12 11 10 9 8
VCC OUT GND PVC FC1 REF N.C./PMO
Pin Definitions and Functions
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol OTC PCS RZI SRC OCI FC2 SYN N.C./PMO REF FC1 PVC GND OUT VCC Function Off Time Circuit Primary Current Simulation Regulation and Zero Crossing Input Soft-Start and Regulation Capacitor Opto Coupler Input Fault Comparator 2 Synchronization Input Not Connected (TDA16846) Reference Voltage and Current Fault Comparator 1 Primary Voltage Check Ground Output Supply Voltage
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PT-92 Chassis Service Manual
TDA16846 Block Diagrams
PVC D4 SYN KSY R7 5V 30k R8 R4 Fold Back Point Correction R6x1/3 11 Primary Voltage Check
+
R6 1.5V
PVA
D5 1V
R3
+
+
15k 75k Control Voltage Limit 5V OTC 1 CS1 Off Time Comparator G1 1 ED2 RSTC/RSTF Eror Amplifier D2
3.5V + VCC 9 8 G4 1 R2 ErrorFlipflop S Q R 6 + FC2 1.2V REF N.C. FC2
+ -
3.5V
5V
RZI
3
+ D3 Buffer for Control Voltage
4 SRC OCI 5
+ + R1 20k
On Time Comparator
& S G2 I1 Q R
G3 &
Output Driver 13 OUT
2 PCS
5V
+
ED1 1.5V D1 Startup Diode 14 12 16V <25mV Overvoltage Comparator Supply Voltage Comparator FC1 1V Zero Crossing Signal
VCC GND
+ -
15.8V
+ -
10
+
1) The input with the lower voltage becomes operative
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PT-92 Chassis Service Manual
ELECTRICAL CHARACTERISTICS
Absolute maximum ratings
All voltages listed are referenced to ground (0V, Vss) except where noted.
Parameter Supply Voltage at Pin 14 Voltage at Pin 1, 4, 5, 6, 7, 9, 10 Voltage at Pin 2, 8, 11 Voltage at Pin 3 Current into Pin 3 Current into Pin 9 Current into Pin 13 ESD Protection REF OUT -100 2 Symbol Vcc RZI -10 -1 100 Limit Values Min. -0.3 -0.3 -0.3 Typ. 17 6 17 6 Unit V V V V mA mA mA mA kV Remarks V3 < - 0.3V V13 > - Vcc V13 < - 0V MIIL STD 883C methot 3015.6, 100 PF, 1500 Storage Temperature Operating Junction Temperature Thermal Resistance Junction-Ambient Soldering Temperature Soldering Time 10 260 s
o
Tstg Tj RthJA
-65 -
125 125 110
o o
C C
P-DIP-14-3 -
K/W C
-
Note: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
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