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Toshiba 20VL44G Service Manual

Tft- lcd tv
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TOSHIBA
LC CHASSIS
20VL44G 20VL55 20VL63
TFT- LCD TV SERVICE MANUAL

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Summary of Contents for Toshiba 20VL44G

  • Page 1 TOSHIBA LC CHASSIS 20VL44G 20VL55 20VL63 TFT- LCD TV SERVICE MANUAL...

  • Page 2: Table Of Contents

    CONTENTS PAGES Safety instructions Technical specifications Power rating and Panel Specifications Remote control explanations Service Menu of the TV Set appearrances Block diagram of the VCTI Block diagram of Microcontroller (Genesis) Block diagram of power supply Data sheet of important IC’s Service mode items and explanations Replacement part List Frequency list of channels...

  • Page 3: Safety Instructions

    SAFETY PRECAUTIONS GENERAL GUIDELINES Always use the manufacturer’s replacement safety High temperature & high humidity components. The critical safety components marked 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: Technical Specifications

    SPECIFICATIONS Receiving System PAL B/G+I+D/K SECAM L/L' Tuning System PLL FST Comb Filter Adaptive 4H\2H LTI, CTI Filters Optional Sync On Green (SOG) support on graphics Scaling Upto SXGA at 75Hz Stereo Decoding (German A2, Nicam, BTSC) German A2, Nicam Virtual Dolby Optional Subwoofer...

  • Page 5: Power Rating And Panel Specifications

    POWER RATING AND PANEL SPECIFICATION 15" 17" 20" 22W" 26" 27" 32" Adaptor Input Built-in Power Built-in Power Built-in Power Current rating Power consumptions 100W 130W 130W 130W St-By Power <3W <3W <3W <3W <3W <3W <3W Consumption 100-240V/50, 60Hz 100-240V/50, 60Hz 100-240V/50, 60Hz 100-240V/50, 60Hz100-240V/50, 60Hz 100-240V/50, 60H100-240V/50, 60Hz Input Range Audio Output Power...

  • Page 6: Remote Control Explanations

    REMOTE CONTROL 1. Picture Format ( 2. Temporary mute of volume (MUTE) ( 3. Numeric buttons 4. Audio/Video (AV) ( 5. PC mode transition ( ) 6. Teletext / MIX / TV choice buttons ( 7. Up (Menu -Teletext) ( 8.

  • Page 7: Service Menu Of The Tv

    SERVICE MENU OF THE TV DEFAULT VALUES OR OPTIONS/ VALUES SETUP ITEM NAME OPTIONS SCART 2 ON/OFF ON/OFF SVHS ON/OFF HOTEL MODE ON/OFF STBY RECALL ON/OFF RECALL LAST AV ON/OFF MSP CARRIER MUTE ON/OFF WSS RF ON/OFF AUTO AV 16:9 ON/OFF FIRST ATS ON/OFF...
  • Page 8 LC (L5C) 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 •...
  • Page 9 ADJUSTMENTS This sub-menu contains numeric adjustments. These items are: • WHITE R • WHITE G • WHITE B • BRIGHTNESS • CONTRAST • COLOR • PRESCALE FM • PRESCALE NICAM • PRESCALE SCART • HOTEL VOLUME WHITE R / WHITE G / WHITE B These are used for color bias adjustment.
  • Page 10 MSP CLIP This selection identifies which method will be used by the sound processor to prevent clipping effects on volume. AUTOPROGRAMMING When the user selects the Autoprogram item in Setup menu, Country Selection menu is opened. The user must select a country before the Autoprogramming starts. Broadcast system will be selected according to the country selected.

  • Page 11: Set Appearrances

    SET APPEARANCE OF 26-32 INCH Power Supply board Main Back light module Audio Amplifier Chassis (Built-in Panel) SET APPEARANCE OF 15-23 INCH Back light module Main Chassis...

  • Page 12: Block Diagram Of The Vcti

    BLOCK DIAGRAM OF VCTI AND PERIPHERALS HEADPHONE JACK HEADPHONE VCTI IC MULTISYSTEM IF INPUT AMPL.TDA1308 FILTER PSS DIP88 TUNER U303 SC1-AUDIO-OUT Aout1 R/L SC2-AUDIO-OUT SPEAKERS Aout2 R/L AUDIO AMPL. SCART 1 MAX9704 SC1 AUDIO-IN L/R OUT Ain2 L/R Ain1 L/R SCART 2 MUTE RGB-IN...

  • Page 13: Block Diagram Of Microcontroller (Genesis)

    BLOCK DIAGRAM OF GENESIS IC AND PERIPHERALS RESET Q 24 BIT RGB OUTPUT TO LVDS INTERFACE RGB-G HS/VS HS/VS-G PANEL CTRL IR INPUT CLOCK KEYBOARD PANEL EN MEMORY CARD-RCA SW U201 EEPROM RCA-S2-SW 24LC16 S1-MAIN-SW U203 PC-SD-SW SERIAL FLASH 25VF040 LED 2 SCART1 PIN 8 PANEL PWR...

  • Page 14: Block Diagram Of Power Supply

    BLOCK DIAGRAM OF 14-23 INCH POWER SUPPLY OPTIONAL FOR 14"-17"-20" S600 S601 U602 MP1593 1.8V STBY U600 MP1593 STEP DOWN (15V) 5V_STBY F600 STEP DOWN U603 LM1117 CONVERTOR 15"-17" 12V FUSE 5A CONVERTOR 20" 15V Tuner Supply 3.3V STBY U601 LM1117 OPTIONAL FOR 20"W- 22"-23"...
  • Page 15 BLOCK DIAGRAM OF 26 - 32 INCH POWER SUPPLY S101 12V-- R101 150K R609 220K R102 10K 5V-- R101 56K R609 NI R102 18K AMP_POW_S AMP_POW U600 MP1593 PNL_PWR U604 STEP DOWN SI9933 CONVERTOR MOSFET POWER SWITCH U606 LM1117 STBY Enable U100 MP1593 5V _ STBY...

  • Page 16: Data Sheet Of Important Ic's

    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 17 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 18 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 19 VCT 49xxI Volume 1: General Description General Description 1.1. Features The VCT 49xxI family offers a rich feature set, cover- 1. Introduction ing the whole range of state-of-the-art 50/60-Hz TV applications. The VCT 49xxI is an IC family of high-quality single- –...
  • Page 20 IFIN+ Sound Audio Frontend Processor Demodulator Processor IFIN- PROT HOUT HFLB VERT Comb Color CVBS in Display & Filter Decoder YCrCb in Video Panorama Video Deflection Frontend Scaler Backend RGB in Processor Component RGB out CVBS out Interface RGB in SENSE I2C Master/ Display...
  • Page 21 January 2001 Si9933ADY ® ® Dual P-Channel PowerTrench MOSFET General Description Features This P-Channel MOSFET is a rugged gate version of • –5 A, –20 V, R = 75 mΩ @ V = –4.5 V DS(ON) Fairchild Semiconductor’s advanced PowerTrench = 105 mΩ...
  • Page 22 MP1593 3A, 28V Step Down Converter Monolithic Power Systems PRELIMINARY General Description Features The MP1593 is a step-down regulator with an 3A Output Current internal Power MOSFET. achieves Programmable Soft-Start continuous output current over a wide input 100mΩ Internal Power MOSFET Switch supply range with excellent load and line Stable with Low ESR Output Ceramic regulation.
  • Page 23 MP1593 3A, 28V Step Down Converter Monolithic Power Systems PRELIMINARY Pin Description BS 1 COMP Exposed Pad on Backside. Connect to Pin 4. Table 1: Pin Designators Name Description High-Side Gate Drive Boost Input. BS supplies the drive for the high-side n-channel MOSFET switch.

  • Page 24: Replacement Part List

    REPLACEMENT PART LIST The components which are referred positions may changes by model, size, cosmetic and specification of the LCD TV. Please apply web pages for current part list. The items marked with red are safety components or need to be replaced with original/approved parts.
  • Page 25 PART PART PART DESCRIPTION PART DESCRIPTION NUMBER NUMBER C200 294125R CC-CHIP 100NF K 25V /0603 X7R C448 294125R CC-CHIP 100NF K 25V /0603 X7R C201 294125R CC-CHIP 100NF K 25V /0603 X7R C449 294125R CC-CHIP 100NF K 25V /0603 X7R C202 294125R CC-CHIP 100NF K 25V /0603 X7R...
  • Page 26 PART PART PART DESCRIPTION PART DESCRIPTION NUMBER NUMBER Q311 401142R TRN-CHIP BC858BLT1G SOT23 L324 053804R COIL-CHIP 10UH K 0805 Q312 401142R TRN-CHIP BC858BLT1G SOT23 C386 290475R CC-CHIP 47PF J 50V /0603 NPO TAPE Q313 401142R TRN-CHIP BC858BLT1G SOT23 C387 290475R CC-CHIP 47PF J 50V /0603 NPO TAPE R329 172276R...
  • Page 27 PART PART PART DESCRIPTION PART DESCRIPTION NUMBER NUMBER C403 294234R CC-CHIP 220NF K 16V /0603 X7R C348 251112R EC 10UF 50V RS 11*5 TAPING R=5MM C404 294234R CC-CHIP 220NF K 16V /0603 X7R C419 291337R CC-CHIP 330PF J 50V /0603 NPO C332 294125R CC-CHIP 100NF K 25V /0603 X7R...
  • Page 28 PART PART PART DESCRIPTION PART DESCRIPTION NUMBER NUMBER D608 303867R DIODE-CHIP SL23 DO214AA R105 172224R RC-CHIP 2.2K J 1/16W/0603 TAPE L609 053946R COIL-CHIP B82464G4223M EPCOS R109 173229R RC-CHIP 22K J 1/16W /0603 U600 453553R IC-CHIP MP1593DN-LF-Z DC-DC CONV SOIC8N X52527R CABLE WITH.TERM.L=110MM YEL C600 294125R...
  • Page 29 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 30: Frequency List Of Channels

    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 31 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...
  • Page 32 L5C LCD TV 14’’,20’’ L5C - SCALER VCT-IF AND PERIPHERALS L300 J224 175mA J316 1V8_STBY VDD1V8D 10uH C341 C300 C337 3V3_STBY 3V3AVDD L200 10U25V 100N 470P L316 Q314 125mA 12V-A 10uH 10uH TP200 L301 Q200 225mA SCL5V SCL3V3 C247 C212 C200 C201 C202...
  • Page 33 L5C LCD TV 14’’,20’’ GRAPHICS D400 LVDS INTERFACE 5V_STBY R420 R421 C446 1N4148 EDID 100N U400 D401 TXE_3P S200 J200 BAV99L PIN13 TP203 R406 J400 BLUE_G C457 BLUE+ J201 TXE_3N PIN14 TP205 BLUE_DSUB BLUE_SW BLUE+ R412 J202 TXCLKEP P400 TP403 PIN15 TP206 TXCLKEN...

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