CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety
Precautions" and "Product Safety Notices" in this service manual.
ATTENTION:
Avant d'effectuer l'entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die ,,Sicherheitshinweise" und ,,Hinweise
zur Produktsicherheit" in diesem Wartungshandbuch zu lesen.
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
Data contained within this Service
manual is subject to alteration for
improvement.
Les données fournies dans le présent
manuel d'entretien peuvent faire l'objet
de modifications en vue de perfectionner
le produit.
Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
APRIL 2002
COLOUR TELEVISION
C32WF540N
No. 0108
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
C28WF540N
C28W440N
CL28W440AN
2
1. INTRODUCTION ______________________________________________ 6
2. SMALL SIGNAL PART WITH TDA8885 ____________________________ 6
2.1.
Vision IF amplifier __________________________________________________6
2.2.
Video Switches _____________________________________________________7
2.3.
Sound Circuit ______________________________________________________7
2.4.
Synchronisation circuit ______________________________________________7
2.5.
Chroma and Luminance processing ____________________________________8
2.6.
Colour Decoder_____________________________________________________8
2.7.
PICTURE IMPROVEMENT FEATURES ______________________________9
2.8.
RGB output circuit and black-current stabilisation _______________________9
2.9.
EAST WEST OUTPUT STAGE ____________________________________10
3. TUNER______________________________________________________ 10
4. VIDEO SWITCH TEA6415C _____________________________________ 11
5. MULTI STANDARD SOUND PROCESSOR ________________________ 11
6. SOUND OUTPUT STAGE WITH TDA 7265 ________________________ 11
7. VERTICAL OUTPUT STAGE WITH STV 9379 ______________________ 12
8. VIDEO OUTPUT AMPLIFIER TDA6108___________________________ 12
9. COMBFILTER TDA 9181 _______________________________________ 12
10.
POWER SUPPLY (SMPS) _____________________________________ 12
11.
POWER FACTOR CORRECTION_______________________________ 12
12.
MICROCONTROLLER SDA555X _______________________________ 12
12.1.
General Features_________________________________________________12
12.2.
External Crystal and Programmable clock speed ______________________12
12.3.
Microcontroller Features __________________________________________12
12.4.
Memory ________________________________________________________13
12.5.
Display Features _________________________________________________13
12.6.
ROM Characters_________________________________________________13
12.7.
Acquisition Features ______________________________________________13
12.8.
Ports ___________________________________________________________13
13.
SERIAL ACCESS CMOS 8K (1024*8) EEPROM ST24C08 ___________ 14
14.
CLASS AB STEREO HEADPHONE DRIVER TDA1308 _____________ 14
15.
SAW FILTERS ______________________________________________ 14
16.
IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM ___________ 14
16.1.
TDA8885:_________________________________
16.1.1.
GENERAL DESCRIPTION ____________________________________________ 15
16.1.2.
FEATURES _________________________________________________________ 15
16.1.3.
Pin Description_______________________________________________________ 15
3
16.2.
UV1315, UV1316_________________________________________________17
16.2.1.
General description of UV1315: _________________________________________ 17
16.2.2.
Features of UV1315: __________________________________________________ 17
16.2.3.
General description of UV1316: _________________________________________ 18
16.2.4.
Features of UV1316: __________________________________________________ 18
16.3.
TEA6415C: _____________________________________________________18
16.3.1.
General Description: __________________________________________________ 18
16.3.2.
Features:____________________________________________________________ 18
16.4.
TDA7265:_______________________________________________________19
16.4.1.
Features:____________________________________________________________ 19
16.4.2.
Pinning: ____________________________________________________________ 20
16.5.
TDA6108Q: _____________________________________________________20
16.5.1.
Features:____________________________________________________________ 20
16.6.
74 HCT 32 ______________________________________________________21
16.6.1.
PINNING ___________________________________________________________ 21
16.7.
MC44608 _______________________________________________________21
16.7.1.
General description: ___________________________________________________ 21
16.7.2.
General Features _____________________________________________________ 22
16.8.
SDA5555: _______________________________________________________22
16.8.1.
General description: ___________________________________________________ 22
16.9.
TDA9181:_______________________________________________________24
16.9.1.
General Features: _____________________________________________________ 25
16.9.2.
Limits: _____________________________________________________________ 25
16.10. TCD1102:_______________________________________________________25
16.10.1.
Description________________________________________________________ 25
16.10.2.
Applications _______________________________________________________ 26
16.10.3.
General features: ___________________________________________________ 26
16.11. ST24C08: _______________________________________________________26
16.11.1.
General description: _________________________________________________ 26
16.11.2.
Features:__________________________________________________________ 26
16.12. TDA1308:_______________________________________________________27
16.12.1.
Features:__________________________________________________________ 27
16.13. PCF8583: _______________________________________________________27
16.13.1.
FEATURES _______________________________________________________ 27
16.13.2.
GENERAL DESCRIPTION __________________________________________ 28
16.14. MC33260:_______________________________________________________28
16.14.1.
General Features: ___________________________________________________ 28
16.14.2.
Safety Features: ____________________________________________________ 29
16.14.3.
LIMITS: __________________________________________________________ 29
16.14.4.
PINNING _________________________________________________________ 29
16.15. STV9379: _______________________________________________________29
16.15.1.
DESCRIPTION ____________________________________________________ 29
16.15.2.
PINNING _________________________________________________________ 30
16.16. MSP34XX : _____________________________________________________30
MSP3411D ______________________________________________________ 30
16.17. LM358N: _______________________________________________________33
16.17.1.
General Description _________________________________________________ 33
16.17.2.
Unique Characteristics _______________________________________________ 33
16.17.3.
Advantages________________________________________________________ 33
16.17.4.
Features __________________________________________________________ 33
4
16.18. SDA9488x_______________________________________________________34
16.18.1.
Features __________________________________________________________ 34
16.19. TDA9885i_______________________________________________________35
17. CHASSIS MANUAL ADJUSTMENTS PROCEDURE __________
37
20 . SCHEMATIC DIAGRAMS
54
21. PARTS LIST
63
18. CIRCUIT DESCRIPTION
45
19. MECHANICAL PARTS
52
5
DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCHED OFF
The mains supply part of the switch mode power supply's transformer is live.
Use an isolating transformer.
The receiver complies with the safety requirements.
SAFETY PRECAUTIONS:
The service of this TV set must be carried out by qualified persons only. Components
marked with the warning symbol on the circuit diagram are critical for safety and must only be
replaced with an identical component.
- Power resistor and fused resistors must be mounted in an identical manner to the original
component.
- When servicing this TV, check that the EHT does not exceed 26kV.
TV set switched off:
Make short-circuit between HV-CRT clip and CRT ground layer.
Short C809 before changing IC800 and IC801 or other components in primary side of the SMPS
part.
Measurements:
Voltage readings and oscilloscope traces are measured under the following conditions:
Antenna signal's level is 60dB at the color bar pattern from the TV pattern generator. (100%
white, 75% color saturation)
Brightness, contrast, and color are adjusted for normal picture performance.
Mains supply, 220VAC, 50Hz.
PERI-TV SOCKET
SCART 1 PINING
1 Audio right output
0.5Vrms / 1K
2 Audio right input
0.5Vrms / 10K
3 Audio left output
0.5Vrms / 1K
4 Ground AF
5 Ground Blue
6 Audio left input
0.5Vrms / 10K
7 Blue input
0.7Vpp / 75ohm
8 AV switching input
0-12VDC /10K
9 Ground Green
10 -
11 Green input
0.7Vpp / 75ohm
12 -
13 Ground Red
14 Ground Blanking
15 Red input
0.7Vpp / 75ohm
16 Blanking input
0-0.4VDC, 1-3VDC / 75 Ohm
17 Ground CVBS output
18 Ground CVBS input
19 CVBS output
1Vpp / 75ohm
20 CVBS input
1Vpp / 75ohm
21 Ground
SCART 2 PINING
1 Audio right output
0.5Vrms / 1K
2 Audio right input
0.5Vrms / 10K
3 Audio left output
0.5Vrms / 1K
4 Ground AF
5 Ground Blue
6 Audio left input
0.5Vrms / 10K
7 -
8 AV switching input
0-12VDC /10K
9 Ground Green
10 -
11 -
12 -
13 Ground Red
14 Ground Blanking
15 Chroma input (optional )
16 -
17 Ground CVBS output
18 Ground CVBS input
19 CVBS output
1Vpp / 75ohm
20 CVBS ( or Luma ) input
1Vpp / 75ohm
21 Ground