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Colour Television Service Manual
Model CE25D5-C
Service Ref. No. CE25D5-C-00 CE25D5-C-01 CE25D5-C-02
PRODUCT CODE: 111351215 ORIGINAL VERSION: Chassis No. EB6-A

CE25D5-C

Give complete "SERVICE REF. NO." for parts order or servicing, it is shown on the rating sheet on the cabinet back of the TV set. Note This TV receiver will not work properly in foreign countries where the television transmission system and power source differ from the design specifications. Refer to the specifications for the design specifications Contents Safety precautions/Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3~5 Cabinet Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Adjustment and Repair Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7~11 CPU Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12~13 Component Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14~15 IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16~20 Pin description of semiconductors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Part Description and reading of schematic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Electric Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24~31

Part No.

SKSM0381

C2VTV/VTS

AUGUST 2000

SAFETY PRECAUTION
1: An isolation transformer should be connected in the power line between the receiver and the AC line when a service is performed on the primary of the converter transformer of the set. 2: Comply with all caution and safety-related notes provided on the cabinet back, inside the cabinet, on the chassis or the picture tube. 3: When replacing a chassis in the cabinet, always be certain that all the protective devices are installed properly, such as, control knobs, adjustment covers or shields, barriers, isolation resistor-capacitor networks etc. Before returning any television to the customer, the service technician must be sure that it is completely safe to operate without danger of electrical shock.

X-RADIATION PRECAUTION
The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is specially constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits, take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and high voltage adjustment to maintain the high voltage within the specified limits.

PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by mark ! in the parts list and the schematic diagram designate components in which safety can be of special significance. It is particularly recommended that only parts designated on the parts list in this manual be used for component replacement designated by mark ! . No deviations from resistance wattage or voltage ratings may be made for replacement items designated by mark ! .

SPECIFICATIONS
Power source Television system Colour system Receiving channel AC 220~240V, 50Hz System B/G PAL/NTSC4.43 (PAL/NTSC4.43/MTSC3.58 IN AV MODE) UHF: #21~69 VHF: E2-E12 CATV: X, Y, Z, S1-S41 75ohm AV1:CENELEC standard with RGB AV2:CENELEC standard with S-inputs AV3:RCA Terminal, Video and Audio (L/R) 12W x 2 680 x 543 x 442mm 26 Kg

Aerial input impedance AV terminal 21 Pin SCART Terminal Front AV Sound output(Music) Dimensions (WxHxD) Weight

-2C2VTV

Outline

Aerial
Q242
R G B R

A101 TUNER
20

Q701 Q711 Q721 VIDEO-OUT X132
VIF
6 7 22 21

BLOCK DIAGRAM

Q141 Q243 G Q244 B

CRT

IC201
X131
SIF
9 54

PC-IN Q121~Q133 TV-IN
3 13 8

POWER

TV-OUT

AV1
SIF-IN SC-1

25

26

I2C BUS
35

34

IF/VIDEO/ CHROMA/ DEF
43 39 40

44 15

BLK B G
16 17

BLK R Y SYNC-IN EW-OUT
26 32

C

C-OUT Y-OUT

15 18

SC-2

45

AV2
MONTO -OUT

46

IC801
R
18 41

This is a diagram for all models and therefore differs slightly from the actual block diagram.

-3CVBS-IN Q431

SCL

47

G B

24

IC803 MEMORY

SDA

23

CPU

H-OUT

Refer also to FIG.-2. AV SELECTOR NICAM DECODER Q432

60 61

T451 FBT T431

PROTECT-IN

19

1 - 15 80 - 63

FOCUS SCREEN

IC802 ROM

PCC CONTROL

D.Y V-OUT IC501
6 3

CS CONTROL

V H

C2VTV

AV Selector NICAM DECODER
K12H FRONT-AV FRONT AV3 MONITOR-OUT SC-1 SC-1 (VIDEO/AUDIO-L/R) SC-2 (VIDEO/Y/C/AUDIO-L/R)

IC1201 AV-SELECTOR
Q1203 1(V) 2(L) 4(R) 13(V) 14(L) 16(R) 7(V) 8(L) 9(Y) 10(R) 11(C) 31 (V)34

MONITOR-OUT
Q1202

Y-IN

SC-2

29 33 32

C-IN L-OUT R-OUT Y-OUT C-OUT
Q1204/1207 Q1205

K12J

IC3451 NICAM 37 & 36 STEREO
12

41(V)

37 38

(VIDEO) IC201 IF/VIDEO/ CHROMA C-OUT Y-OUT SIF-IN IC001 AUDIO-OUT AUDIO L/R-OUT SDA/SCL

AUDIO-OUT

60 61 4 5

I2C BUS

Fig.-2 System Control

KEY-IN

RC-IN

I2C BUS CONTROL

25

POWER

26

28

MUTE
40 44 45

IC803 MEMORY

SCL 24 SDA 23

IC801 CPU

46 47

BLK-OUT B-OUT G-OUT R-OUT

POWER-FAIL DETECT

19 1 - 7, 63 - 80

60 61

Q806

CVBS

IC802 ROM

Fig.-3 -4C2VTV

Deflection Control IC501 V-Output
6 3

Deflection Yoke
Vert. Coil
Q431 H-Output

IC201 26 IF/VIDEO/ DEFLECTION
32

V-Drive

Q431

T431 Drive Trans

Horiz. Coil

H-Drive
L461/L462

D441

T451 FlyBack Trans

CS SW
41

Screen Width Control
EW-Out Q462 Q461 Pcc Control

-5C2VTV

CABINET DISASSEMBLY
CABINET BACK DISASSEMBLY
(A) 1. Remove 7 screws(A). 2. Pull out the cabinet back. (A) (A) (A)

(A) (A)

(A)

PLACING THE CHASSIS TO SERVICE POSITION
1. Pullout the chassis and put it to the rails on the side cabinet. 2. Fix main board with hook on the top rail.

-6C2VTV

OPTION SETTING
[After replacing the Memory IC (IC803)]
The memory IC, IC803, stores the option data of TV set and service adjustments data for each circuit, therefore, when the memory IC is replaced, it should be performed following setting and "SERVICE ADJUSTMENT" on next page.

To enter to the Option Mode
+ Press and hold the F/OK button on the remote control and Pw button on the front panel of the TV. The option window will appear on the screen. Set the options as shown below.
OPTION
ON-TIMER ON SORT MODE AUTO TUNE/SORT PLUG & PLAY ON WELCOME TEXT ON CODE TEST OFF WSS ON WIDE OFF OPTION UK 312/313 Mode OFF AV3 OPTION ON 3D SURROUND ON ADJUST : EXIT : RECALL

To set the option mode
+ Highlight the desired option item by using the Pv or Pw button . + To switch the option mode, use the Volume - (LEFT) or Volume + (RIGHT) button. + The data which is set in the option mode is stored into the memory IC automatically. Following table shows the available option items and default setting mode.

Option Mode
ON-TIMER SORT MODE

Mode
ON or OFF AUTO TUNE/SORT or AUTO TUNE or ATS EURO PLUS

Description & Note
On-timer available, default "ON" Tuning mode, default "AUTO TUNE/SORT"

PLUG & PLAY WELCOME TEXT CODE TEST WSS WIDE OPTION 312/313 Mode AV3 OPTION 3D SURROUND

ON or OFF ON or OFF OFF or ON ON or OFF ON or OFF UK or IRELAND ON or OFF ON or OFF ON or OFF

Plug & Play mode, default "ON" Display message when first set up, default "ON" For factory use, default "OFF" Wide Screen Signaling available, default "ON" Wide mode, default "ON" Destination option , default "UK" Teletext mode, default OFF Front AV disable, default ON 3D Surround available, default ON

Exit from the Service Mode
+ Press the RECALL button.

-7C2VTV

SERVICE ADJUSTMENTS
Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the adjustments are carried out by using the RC handset.

[After replacing the Memory IC (IC803)]
The memory IC, IC803, stores the service adjustments data for each circuit, therefore, when the memory IC is replaced, it should be performed "OPTION SETTING" on previous page and the following adjustments, refer to further adjustment on page 14.

ADJUSTABLE SERVICE ADJUSTMENT
REGULAR Item No. 1 2 3 4 7 8 OSD AGC CUT GRY GRY HBP OSD Description AGC Adjustment Cut-Off Drive Adjustment G-Drive Adjustment B-Drive Adjustment H-Blanking Phase Adjustment OSD Positioning Adjustment

WIDE Item No. 1 2 5 6 7 8 10 OSD P V-P P H-P P V-S P H-S P PCC P TRP P CNR Description Vertical Centre Adjustment Horizontal Centre Adjustment Vertical Size Adjustment Horizontal Size Adjustment Pcc Adjustment Trapezoid Distortion Adjustment Corner Adjustment

IMPORTANT NOTICE Do not attempt to adjust service adjustments not listed on the above otherwise it may cause loss of performance and product safety.

To enter to the Service Mode
+ Press and hold the GREEN button on the remote control and then press the Pw button inside of the door. The adjustment window will appear on the screen.

ADJUST
REGULAR WIDE OTHERS TB1251 SELECT: OK EXIT : RECALL

-8C2VTV

To select the mode and service item and change data value
+ Highlight the desired adjustment mode by using the Pv or Pw button and then press the F/OK button. + To select the adjustment item, use the Pv or Pw button. + To change the service data, use the Volume -(LEFT) or Volume + (RIGHT) button. + The data which is set in the service mode is stored into the memory IC automatically. REGULAR mode WIDE mode

REGULAR 1, AGC

38

WIDE 1. P V-P

1F

Adjustment No. and Item name

Adjustment Data

Adjustment No. and Item name

Adjustment Data

Exit from the Service Mode
+ Press the RECALL button or turn off the TV set by using the Mains switch.

INITIALISATION OF MEMORY IC
To initialise the memory IC (IC803), press and hold the NORMAL button on te remote control and then press the Pv button on the front panel of the TV set, and then turn the Mains switch Off and On. Now the initialisation is completed. When initialised the memory IC, all of the setting data (option data and service adjustment data) stored in the IC are reset to the default value. So it is necessary to set the option settings and readjust the service adjustments listed on left page.

-9C2VTV

ADJUSTMENTS IMPORTANT NOTICE
Do not attempt to adjust the following service adjustments except when adjustments are required in servicing otherwise it may cause loss of performance and product safety. + B VOLTAGE ADJUSTMENT 1. Receive white raster pattern. 2. Set controls to normal. 3. Connect digital voltmetre to test point TP-B and GND. 4. Adjust voltage to 150 ±0.5V by using VR641. DRIVE ADJUSTMENT 6. Select item no.3 "REGULAR 3, GRY" (G-Drive) or 4 "REGULAR 4, GRY" (B-Drive) and adjust both initially to 3F. 7. Change data value of each item by using LEVEL + or LEVEL - button to obtain the proper white balance. PCC ADJUSTMENT AGC ADJUSTMENT 1. Input and tune an RF signal which is UHF to the clearest station. 2. Connect digital voltmetre to test point TP-A and GND. 4. Enter to the service mode and select mode "REGULAR", and select item no.1 "REGULAR 1, AGC". 5. Press the LEVEL+ or LEVEL - button to adjust voltage to be 3.2Vdc. PCC ADJUSTMENT 1. Receive cross hatch pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 7 "WIDE 7.P PCC". 3. Press the LEVEL+ or LEVEL - button to adjust the vertical line to be straight.

FOCUS ADJUSTMENT By using FOCUS VR, adjust focus control for well defined scanning lines. TRAPEZOID ADJUSTMENT 1. Receive cross hatch pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 8 "WIDE 8.P TRP". 3. Press the LEVEL+ or LEVEL - button to correct the trapezum distortion of the vertical line.

GREY SCALE ADJUSTMENT SCREEN ADJUSTMENT 1. Receive black & white pattern. 2. Enter to the service mode and select mode "REGULAR", and select item no. 2 "REGULAR 2, CUT". The horizontal line will appear on the screen. 3. Set the SCREEN VR for one colour to be just visible. 4. Using the numeric buttons shown set each colour to minimum by decreasing to the point where any further decrease resets the adjustment to maximum value. BIAS ADJUSTMENT 5. By using the buttons 1, 2, 4, 5, 7, 8 on the remote control, adjust the line to be white. The key allocation is as follows;

Button No. Operation 1 Increase Red 2 Decrease Red 4 Increase Green 5 Decrease Green 7 Increase Blue 8 Decrease Blue

-10C2VTV

CORNER ADJUSTMENT 1. Receive cross hatch pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 10 "WIDE 10.P CNR". 3. Press the LEVEL+ or LEVEL - button to correct the distortion of the vertical line around the corners.

VERTICAL HEIGHT ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 5 "WIDE 5.P V-S. 3. Press the LEVEL+ or LEVEL - button to adjust the vertical height.

HORIZONTAL ADJUSTMENT HORIZONTAL CENTRING ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 2 "WIDE 2.P H-P". 3. Press the LEVEL+ or LEVEL - button to adjust the horizontal centre. HORIZONTAL WIDTH ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item 6 "WIDE 6.P H-W". 3. Press the LEVEL+ or LEVEL - button to adjust the horizontal width. OSD POSITIONING ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "REGULAR", and select item no. 8 "REGULAR 8 OSD". The OSD test bar will appear on the top of screen. 3. Press the LEVEL+ or LEVEL - button to adjust proper OSD positioning.

HIGH-VOLTAGE CONFIRMATION 1. Receive circular pattern and set screen mode to "FULL". 2. Set controls to normal. 3. Connect high-voltage meter to the anode of CRT and GND. 4. Confirm that voltage is 29.0±1.0kV at 1.4mA for 25" model. VERTICAL ADJUSTMENT VERTICAL CENTRING ADJUSTMENT 1. Receive circular pattern and set screen mode to "FULL". 2. Enter to the service mode and select mode "WIDE", and select item no. 1 "WIDE 1.P V-P". .3 Press the LEVEL+ or LEVEL - button to adjust the vertical centre.

-11C2VTV

CPU PORT FUNCTIONS
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Function Name MMU0 MMU3 ADDR10 DSN ADDR11 ADDR9 ADDR8 RWN GND VDD OSC-IN OSC-OUT ADDR13 ADDR14 MMU1 MMU2 MMU4 MMU5 P3.7/CSO P3.6/ASN P3.5 P3.4 P5.1 P5.0 P2.0 P2.3 P2.4 P0.2 P0.1 P0.0 P4.7 P4.6 P4.5 VDD GND P2.1 P2.2 P2.5 P4.4 P4.3 P4.2 P4.1 P4.0 FB B G R V-SYNC H-SYNC WSCR Function External memory 0 External memory 3 Address bus 10 Data Strobe Address bus 11 Address bus 9 Address bus 8 Read Write Strobe Power Supply Clock Input Clock Output Address bus 13 Address bus 14 External memory External memory External memory External memory IN/OUT OUT OUT OUT OUT OUT OUT

1 2 4 5

IN IN OUT OUT OUT OUT OUT OUT OUT IN OUT OUT OUT IN/OUT OUT IN OUT OUT IN OUT IN OUT OUT OUT IN IN IN IN OUT OUT OUT OUT OUT OUT OUT OUT OUT IN IN

Protect - Power failure detect input Dolby CLK(L/L') Dolby SO(Super 3D) PITTARI switch IIC BUS SDA IIC BUS SCL Remote Control Signal Input Power Relay & LED Drive On: L SUB CPU SO Key switch input SUB CPU CLK SUB CPU SI THRESHOLD switch JIMAKU(Caption) switch On-Timer LED Drive ON: L

AV1 Scart function input AV2 Scart function input RF AGC input H-Blank On/Off AMP Mute Mute On: H Dolby RQ H-Blank Phase 50/60Hz output 50Hz: H BLK Output for OSD (Active H) Blue Output for OSD (Active H) Green Output for OSD (Active H) Red Output for OSD (Active H) V-Sync Input (Active H) H-Sync Input (Active H) VPS/WSS Slicer Line PLL

-12C2VTV

Pin No. 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

Function Name WSCF VDD-A PXFM RESET MCFM JTRSTO TXCF CVBS0 TEST0 CVBS1 CVBS2 GND-A DAT3 DAT4 DAT5 DAT6 DAT7 DAT2 DAT1 DAT0 ADDR0 ADDR1 ADDR2 ADDR3 ADDR4 ADDR5 ADDR6 ADDR7 ADDR12 ADDR15

Function VPS/WSS Slicer Line PLL Analogue Power Supply Pixel Frequency Multiplier Reset Input (Active L) Pixel Frequency Multiplier

IN/OUT IN IN

Video signal Input Video Signal Input Data Data Data Data Data Data Data bus bus bus bus bus bus bus 3 4 5 6 7 2 1 0 1 2 3 4 5 6 7 12 15

IN IN IN IN IN IN IN IN IN IN OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT

Data bus 0 Address bus Address bus Address bus Address bus Address bus Address bus Address bus Address bus Address bus Address bus

-13C2VTV

C2VTV

MAIN BOARD

KMA

T681 VR641

COMPONENT LOCATIONS

IC801 UNDERSIDE OF BOARD

IC802

IC001

KMB

T611

Q613

-14IC501H2

Q461

IC201

TP-B KX T131

IC501

Q432

T451
IC501H3

A101

KJ K1002 K1001

KM

TP-A

CRT BOARD

Q701

C735

K7D1 K7Q

K7P

-15C2VTV

IC BLOCK DIAGRAMS
IC001 TDA7263M