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Toshiba 15VL34 Service Manual

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TOSHIBA
SERVICE MANUAL
COLOUR TELEVISION
15VL34
PRINTED IN UK. 2005 C

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Summary of Contents for Toshiba 15VL34

  • Page 1 TOSHIBA SERVICE MANUAL COLOUR TELEVISION 15VL34 PRINTED IN UK. 2005 C...
  • Page 2 CONTENTS PAGES Safety instructions Technical specifications Panel Specification Chassis block diagram Scaler block diagram Block diagram of power supply Chassis overwiev Service mode items and explanations Data sheet of important IC’s Recommended Part List Frequency list of channels...

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS GENERAL GUIDELINES Always use the manufacturer’s replacement safety components. The critical safety components marked High temperature & high humidity reduce the life-time. with on the schematics diagrams should not be LCD is not proper to be used at high temperature by other substitutes.
  • Page 4 L5A TECHNICAL SPECIFICATION Receiving System PAL B/G+I+D/K SECAM L/L' Comb Filter Adaptive 4H\2H Scaling Upto SXGA at 75Hz Gamma Correction 8 to 10-bit LUT Histogram Equalization Stereo Decoding German A2, Nicam (German A2, Nicam, BTSC) Stereo L, R In Stereo L, R Out Audio Output Power RMS in Max at 10% THD) 2x3W, 2x5W for 22"W Level (1.5, 2.5, Teleweb)

  • Page 5: Panel Specification

    PANEL SPECIFICATION 14" 15" 17" 17W" 20" 22W" 23W" Samsung Hannstar Manufacturer Samsung Samsung Samsung Sanyo Double TTL\Single Single TTL\Single Interface Single LVDS Dual LVDS Single LVDS Single LVDS Single LVDS LVDS LVDS SVGA (800x600) Resolution VGA (640x480) XGA (1024x768) SXGA (1280x1024) WXGA (1280x768) WXGA (1280x720) WXGA (1280x768)
  • Page 6 BLOCK DIAGRAM OF MAIN CHASSIS (L5A) SVHS-Y/C SC1-RGB CVBS-IF Video Decoder Scaler PANEL Tuner IF VPC 3230D Stage HS/VS HS/VS HS/VS CVBS HS/VS VGA-IN EEPROM 24LC02 Teletext Decoder EEPROM SDA 5550 24LC16 K6T1008V2E M29W040 Flash SRAM (Optional) Memory TDA1571 Stereo Amplifier MSP3410G AUDIO DECODER...
  • Page 7 BLOCK DIAGRAM OF SCALER BAC LIGHT UNIT Panel_En Standby Mute Reset S508 (LVDS) S500(TTL) BR1_ADJ BLK_EN HS/VS LVDS GM 5221 U500 CONNECTOR (20 OR 30 PINS) VGA_RGB (S503,S502) CONTROLLER VGA HS/VS S506 CONN. DAUGHTER BOARD FOR TTL INTERFACES U501 U503 KEYBOARD PARALEL SERIAL FLASH...
  • Page 8 L5A POWER SUPPLY BLOCK DIAGRAM 3.3V-STBY LM1117 S600 V-INV 3.3V +15V-STBY DC Jack 15V,12V F600 +5V-STBY LM2576 LM2576 1.8V-STBY LM1117 U600 U607 1.8V Fuse S602 U605 F601 V-INV V-INV 78L08 2.5V U606 LM117-3.3V 3.3V U604 INPUT: 12V FOR 14,15,17 INCH 5V-STBY U602 15V FOR 20, 22 INCH...
  • Page 9 L5-A Low-to-Mid End LCD-TV BOARD OVERVIEW L5-A Low-to-Mid End LCD TV board incorporates the LCD Controller gm2221, to create a high quality, stand-alone LCD-based TV system for consumer applications. Figure 1 illustrates the Block diagram of the board. This board supposed to have two versions: 1.
  • Page 10 On the board, one high quality video decoder (U100) is provided (VPC3230D of Micronas) to process video inputs coming from the video sources. The video processor can process 3 composite video inputs and 1 S-Cideo input from the NTSC/PAL video sources. The CVBS output recovered from the tuner module is made available to one of the video inputs of the video decoder.
  • Page 11 A keypad connector (S507) is provided which utilizes the integrated low bandwidth ADC in gm2221 for scanning 5-6 keys (menu,V+,V-,P+,P- keys standard- source key optional) on the keypad. The keypad allows access to the OSD without using the remote IR controller. The L5-A board also has In System Programming (ISP) capability for the external flash ROM using DDC2Bi.

  • Page 12: Lcd Panel Interface

    4. GM2221 LCD TV CONTROLLER The gm2221 IC is a highly integrated single channel scaler that can be used for both LCD monitors up to SXGA/UXGA resolutions and rear projection systems with DLP and HTPS LCD engines up to 1280x720 (720P). Some of the key features include: •...

  • Page 13: Hotel Mode

    L5A SERVICE MENU Service Menu is entered by pressing 9, 3, 0, 1 keys on the remote controller when the Picture icon is highlighted in the Main Menu. Service Menu has 3 sub-menus. These are: • Options • Adjustments • Selections.
  • Page 14 STAND BY If this Option is OFF, the TV will stay in Stand By mode after a Power On. If this Option is ON, the TV will recall its last stand by status before the Power Off, and switch on from Stand By automatically, if the last state was ‘Stand by On’.
  • Page 15 SELECTIONS This sub-menu contains selections. • TUNER TYPE SAMSUNG / PHILIPS • TELETEXT NO TEXT / FAST / FAST&TOP • MSP CLIP REDUCE VOL / REDUCE TONE / COMPROMISE / DYNAMIC TUNER TYPE One of two supported tuner can be selected from this item. System must be restarted for this change to take effect.
  • Page 16 NORWAY POLAND PORTUGAL SPAIN SWEDEN SWITZERLAND BG + L TURKEY UNITED KINGDOM For countries France, Belgium and Switzerland, autoprogramming is done twice. For Belgium and Switzerland, first BG channels will be searched, after the search in BG is done, searching will restart for L standard.
  • Page 17 DEFAULT OPTIONS/ ITEM NAME VALUES OR VALUES SETUP OPTIONS ON/OFF ON/OFF ON/OFF ON/OFF SCART 2 ON/OFF ON/OFF SVHS ON/OFF HOTEL MODE ON/OFF STBY ON/OFF MSP CARRİER MUTE ON/OFF WSS SCART ON/OFF FIRST ATS ON/OFF BACKLIGHT POL ON/OFF FACTORY MODE ON/OFF ADJUSTMENTS WHITE R 0-255...
  • Page 18 GENESIS GM5221 LCD TV CONTROLLER The gm5221 is an LCD TV controller supporting resolutions up to SXGA (1280x1024). The gm5221 leverages Genesis patented advanced image-processing technology as well as a proven integrated ADC/PLL and an Ultra-Reliable DVI™ compliant digital receiver to provide excellent image quality. gm5221 also integrates a microcontroller, an OSD controller, advanced color management and dual LVDS transmitters.
  • Page 19 1.2 gm5221 Family Features • • Intelligent Image Processing™ Embedded X86 On-chip Microcontroller • • Fully programmable zoom ratios High-performance X86 MCU with on-chip RAM and ROM • • High-quality shrink capability from UXGA resolution External parallel ROM or serial SPI ROM interface •...
  • Page 20 2 gm5221 Pinout The gm5221 devices are packaged in a 208-pin Plastic Quad Flat Pack (PQFP). AGND_ADC ROM_DATA3 RESERVED ROM_DATA2 AVDD_ADC_3.3 ROM_DATA1 AGND_RED ROM_DATA0 RED- ROM_OEn RED+ ROM_WEn AVDD_RED_3.3 ROM_CSn AGND_GREEN CRVSS GREEN- CVDD_1.8 GREEN+ RESERVED SOG_MCSS AVDD_LV_E_3.3 AVDD_GREEN_3.3 AVSS_LV_E AGND_BLUE CH3P_LV_E/ER0 BLUE-...
  • Page 21 Video Processing - VPC3230D 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 GNDF I2CSEL ISGND VSUPF VSUPY VOUT GNDY VIN1 VPC3230D VIN2 VIN3 VIN4 GNDLLC VSUPAI VSUPLLC...
  • Page 22 Video Processing - VPC3230D 1. Features Video Decoding RGB Processing - 4 Composite inputs, 1 S-VHS input - Programmable RGB matrix - Composite video & sync output - Digital color bus interface - integrated high-quality A/D converters - Additional analog RGB/Fast blank input - Adaptive 2H comb filter Y/C separator - Half contrast switch - 1H NTSC comb filter...
  • Page 23 Block Diagram CIN1 Adaptive MIXER 2D Scaler Output Y OUT Analog Color Comb Formatter Front End Decoder VIN1 Filter CrCb OUT VIN2 Panorama NTSC, ITU-R 656 Mode YCOE PAL, ITU-R 601 VIN3 SECAL AGC, Contrast FIFO Memory NTSC 2*ADC VIN4 Brightness CNTL Control...
  • Page 24 Video Processing - VPC3230D Pin Name Type Pin Name Type Short Description Short Description B1/CB1IN GND PA SUPPLYD Blue1/Cb1 Analog Component Input Ground, Pad Decoupling Circuitry G1/Y1IN V SUPPA SUPPLYD Green1/Y1 Analog Component Input Supply Voltage, Pad Decoupling Circuitry R1/CR1IN LLC2 Red1/Cr1 Analog Component Input Double Clock Output...
  • Page 25 Video Processing - VPC3230D Pin Name Type Pin Name Type Short Description Short Description Picture Bus Chroma Chroma / Analog Video 5 Input VIN1 Picture Bus Chroma(LSB) Video 1 Analog Input GND SY SUPPLYD Ground, Sync Pad Circuitry VIN2 Video 2 Analog Input V SUPSY SUPPLYD Supply Voltage, Sync Pad Circuitry VIN3 Video 3 Analog Input...
  • Page 26 Audio Processing - MSP3440G 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 AVSUP CAPL_M AVSUP AHVSUP ANA_IN1+ CAPL_A SC1_OUT_L ANA_IN- SC1_OUT_R ANA_IN2+ VREF1 TESTEN SC2_OUT_L XTAL_IN XTAL_OUT...
  • Page 27 Audio Processing - MSP3410D Pin Name Type Pin Name Type Short Description Short Description V SUPPA SUPPLYD Not connected Supply Voltage I2C_CL IN/OUT LLC2 I2Cclock Double Clock Output I2C_DA IN/OUT LLC1 IN/OUT I2C data Clock Output I2S_CL IN/OUT V SUPLLCSUPPLYD I2S clock Supply Voltage, LLC Circuitry I2S_WS...
  • Page 28 Audio Processing - MSP3440G Short Description Pin Name Type Pin Name Type Short Description Crystal oscillator GND SY SUPPLYD XTAL_OUT OUT Ground, Sync Pad Circuitry Test pin V SUPSY SUPPLYD Supply Voltage, Sync Pad Circuitry Audio clock output(18.432MHz) INTLC AUD_CL_OUT O UT Interlace Output Active Video Output Not connected...
  • Page 29 SDA5550 MICROCONTROLLER BLOCK DIAGRAM...

  • Page 30: Part Description

    ADAPTOR AC12V/5A CLASS II ZC5850-00A ACCESSORIE BOX 20" LCD TV BEKO ZF9110 L5A CHASIS 14"TOS P/NX/1/K/S/VGA/NT A-OS ZF9187F RC L5A TOSHIBA GRI/SHINE SI.P.ED CT-873 ZG4110 L5A CHASIS 20"TOS AU P/NX/2/K/S/VGA/NT ZG4255-01 BACK COVER TOSH.BRI.SIL.P.20" LCDTV VGA ZH1183-CH1 INVERTOR 20" V201V1-T01 (PLCD0318604H) ZH6183-AU3 INVERTOR 14"...

  • Page 31: Frequency Table (Mhz)

    FREQUENCY TABLE (MHz) Channel Number L/L' 49.75 49.75 47.75 48.25 59.25 59.25 55.75 55.25 77.25 77.25 60.50 62.25 85.25 85.25 63.75 175.25 93.25 93.25 176.00 182.25 175.25 175.25 184.00 189.25 183.25 183.25 192.00 196.25 191.25 191.25 200.00 203.25 199.25 199.25 208.00 210.25 207.25...
  • Page 32 Channel Number L/L' 663.25 663.25 663.25 663.25 671.25 671.25 671.25 671.25 679.25 679.25 679.25 679.25 687.25 687.25 687.25 687.25 695.25 695.25 695.25 695.25 703.25 703.25 703.25 703.25 711.25 711.25 711.25 711.25 719.25 719.25 719.25 719.25 727.25 727.25 727.25 727.25 735.25 735.25 735.25 735.25...
  • Page 33 Channel Number L/L' 259.25 271.25 271.25 284.75 266.25 279.25 279.25 296.75 273.25 287.25 287.25 55.75 280.25 295.25 295.25 60.50 287.25 303.25 303.25 63.75 294.25 303.25 303.25 311.25 311.25 311.25 311.25 319.25 319.25 319.25 319.25 327.25 327.25 327.25 327.25 335.25 335.25 335.25 335.25 343.25...