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TOSHIBA 20" TFT
(20WL56)

SERVICE MANUAL

RELEASE DATE: 08.09.2005
PREPARED BY: VESTEL ELECTRONICS
THIS PAGE IS INTENTIONALLY LEFT BLANK
TABLE OF CONTENTS
1. INTRODUCTION ...................................................................................................................................... 1
2. TUNER...................................................................................................................................................... 1
3. IF PART (TDA988X) ................................................................................................................................. 1
4. MULTI STANDARD SOUND PROCESSOR ............................................................................................ 1
5. AUDIO AMPLIFIER STAGE WITH TPA3002D2 ...................................................................................... 2
6. POWER .................................................................................................................................................... 2
7. MICROCONTROLLER SDA55XX............................................................................................................ 2
8. SERIAL ACCESS CMOS 16K (2048*8) EEPROM ST24C16 .................................................................. 3
9. CLASS AB STEREO HEADPHONE DRIVER TDA1308 ......................................................................... 3
10. SAW FILTERS.......................................................................................................................................... 3
11. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM ....................................................................... 4
11.1. LM1117.............................................................................................................................................. 4
11.2. LM2576.............................................................................................................................................. 5
11.3. LM317T ............................................................................................................................................. 6
11.4. ST24LC21 ......................................................................................................................................... 7
11.5. TEA5114A ......................................................................................................................................... 8
11.6. TEA6415............................................................................................................................................ 9
11.7. VPC3230D....................................................................................................................................... 10
11.8. SDA55XX (SDA5550)...................................................................................................................... 12
11.9. TPA3002D2 ..................................................................................................................................... 13
11.10. TDA9885/86 .................................................................................................................................... 15
11.11. TDA1308 ......................................................................................................................................... 16
11.12. PI5V330........................................................................................................................................... 17
11.13. GM6015........................................................................................................................................... 18
11.14. MST9883 ......................................................................................................................................... 19
11.15. M74HC4052 .................................................................................................................................... 21
11.16. MC34063 ......................................................................................................................................... 22
11.17. MSP34X0G...................................................................................................................................... 23
11.18. DS90C385 ....................................................................................................................................... 26
11.19. NDS8947 ......................................................................................................................................... 27
12. SERVICE MENU SETTINGS ................................................................................................................. 28
12.1. OPTIONS MENU SETTINGS.......................................................................................................... 29
12.2. APS WSS TEST MENU .................................................................................................................. 34
13. BLOCK DIAGRAM.................................................................................................................................. 35
14. CIRCUIT DIAGRAMS ............................................................................................................................. 36

i
20" TFT TV Service Manual 08/09/2005
1. INTRODUCTION
20" TFT-LCD TV is a Progressive TV control system based on the