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Toshiba+27WLT56B


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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



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