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TOSHIBA
27WLT56B
SERVICE MANUAL
TABLE OF CONTENTS
1. INTRODUCTION ...................................................................................................................................... 1
2. TUNER...................................................................................................................................................... 1
3. IF PART (TDA9886) ................................................................................................................................. 1
4. MULTI STANDARD SOUND PROCESSOR ............................................................................................ 2
5. VIDEO SWITCH TEA6415 ....................................................................................................................... 2
6. AUDIO AMPLIFIER STAGE WITH TPA3002D2 ...................................................................................... 2
7. MAIN POWER SUPPLY (SMPS) AND POWER INTERFACE BOARD .................................................. 3
8. MICROCONTROLLER ............................................................................................................................. 3
9. SERIAL ACCESS CMOS 4K x 8 (32K bit) EEPROM 24C32A................................................................. 3
10. CLASS AB STEREO HEADPHONE DRIVER TDA1308 ......................................................................... 3
11. SAW FILTERS.......................................................................................................................................... 3
12. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM ....................................................................... 4
12.1. TDA9886 ........................................................................................................................................... 5
12.2. TEA6415C ......................................................................................................................................... 6
12.3. 24C32A.............................................................................................................................................. 7
12.4. SAA5264 ........................................................................................................................................... 8
12.5. LM317.............................................................................................................................................. 10
12.6. ST24LC21 ....................................................................................................................................... 10
12.7. TLC7733.......................................................................................................................................... 11
12.8. 74LVC257A ..................................................................................................................................... 12
12.9. 74LVC14A ....................................................................................................................................... 12
12.10. LM1117............................................................................................................................................ 13
12.11. IRF7314- IRF7316........................................................................................................................... 14
12.12. MC34063A....................................................................................................................................... 15
12.13. LM2576- 52kHz Simple 3A Buck Regulator.................................................................................... 16
12.14. DS90C385 ....................................................................................................................................... 17
12.15. MSP34X1G...................................................................................................................................... 19
12.16. TPA3002D ....................................................................................................................................... 22
12.17. TDA1308 ......................................................................................................................................... 22
12.18. PI5V330........................................................................................................................................... 23
12.19. MST9883 ......................................................................................................................................... 23
12.20. SAA7118E ....................................................................................................................................... 25
12.21. TPS72501........................................................................................................................................ 30
12.22. TSOP1136....................................................................................................................................... 32
12.23. PCF8591 ......................................................................................................................................... 32
12.24. PW1231........................................................................................................................................... 33
12.25. PW181............................................................................................................................................. 34
12.26. SIL1169 ........................................................................................................................................... 35
12.27. SDRAM 4M x 16 (MT48LC4M16A2TG-75)..................................................................................... 36
12.28. FLASH 16MBit................................................................................................................................. 38
12.29. ASM3P2814 .................................................................................................................................... 39
12.30. 74LX1G86 ....................................................................................................................................... 40
12.31. 74HCT4053 ..................................................................................................................................... 41
13. IC DESCRIPTIONS (FOR DIGITAL) ...................................................................................................... 42
13.1. STI5518 ........................................................................................................................................... 42
13.2. MAX232_SMD................................................................................................................................. 42
13.3. 74HCU04......................................................................................................................................... 43
13.4. TSH22 ............................................................................................................................................. 44
13.5. CS4334............................................................................................................................................ 44
13.6. AMIC A43L2616 .............................................................................................................................. 45
13.7. MX29LV160T................................................................................................................................... 47
13.8. 24C32 .............................................................................................................................................. 48
13.9. STV0360.......................................................................................................................................... 49
13.10. MAX809........................................................................................................................................... 52
13.11. TDCC2345TV39A............................................................................................................................ 53
13.12. STV0700.......................................................................................................................................... 53
i
27" TFT TV Service Manual 05/09/2005
14. SERVICE MENU SETTINGS ................................................................................................................. 58
14.1. display menu ................................................................................................................................... 58
14.2. calibration menu .............................................................................................................................. 60
14.3. deinterlacer menu............................................................................................................................ 62
14.4. factory settings menu ...................................................................................................................... 64
15. BLOCK DIAGRAMS ............................................................................................................................... 65
16. CIRCUIT DIAGRAMS ............................................................................................................................. 67
ii
27" TFT TV Service Manual 05/09/2005
1. INTRODUCTION
27" TFT IDTV is a progressive TV control system with built-in de-interlacer and scaler. It uses a
1280*720 panel with 16:9 aspect ratio.The TV is capable of operation in PAL, SECAM, NTSC
(playback) colour standards and multiple transmission standards as B/G, D/K, I/I', and L/L' including
German and NICAM stereo. Sound system output is supplying 2x8W (10%THD) for stereo 8
speakers. The chassis is equipped with many inputs and outputs allowing it to be used as a center of a
media system.
It supports following peripherals:
2 SCART's with all of them supporting full SCART features including RGB input
1 AV input. (CVBS+ Stereo Audio)
1 SVHS iput
1 Stereo Headphone output
1 D-Sub 15 PC input
1 DVI input (supports HDCP)
1 Audio line out
1 Stereo audio input for PC/DVI
2 CI (Common Interface) slots
Other features include, 10 pg Teletext, Picture-In-Picture (PIP) , Picture-And-Picture (PAP) , Picture-
And-Text (PAT).
2. TUNER
The tuners used in the design are combined VHF, UHF tuners suitable for CCIR systems B/G, H, L, L',
I/I', and D/K. The tuning is available through the digitally controlled I2C bus (PLL). Below you will find
info on one of the Tuners in use.
General description of UV1316:
The UV1316 tuner belongs to the UV 1300 family of tuners, which are designed to meet a wide range of
applications. It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L', I and I'. The low
IF output impedance has been designed for direct drive of a wide variety of SAW filters with sufficient
suppression of triple transient.
Features of UV1316:
1. Member of the UV1300 family small sized UHF/VHF tuners
2. Systems CCIR: B/G, H, L, L', I and I'; OIRT: D/K
3. Digitally controlled (PLL) tuning via I2C-bus
4. Off-air channels, S-cable channels and Hyperband
5. World standardised mechanical dimensions and world standard pinning
6. Compact size
7. Complies to "CENELEC EN55020" and "EN55013"
Pinning:
1. Gain control voltage (AGC) : 4.0V, Max: 4.5V
2. Tuning voltage
3. I