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DIGIMEDIA LT26HVX Service Manual

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DigiMedia
LCD TV For LT26HVX
Job Function
CPO
Project Manager
R&D Dept. Manager
EE Dept. Manager
ME Dept. Manager
Engineering Dept. Manager
Sales Dept. Manager
Quality Assurance Dept. Manager
Author

Service Manual

Doc. No.：
Version：1.0
Total Pages：34
Approvals
Signature
Date

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Summary of Contents for DIGIMEDIA LT26HVX

  • Page 1: Service Manual

    DigiMedia Service Manual LCD TV For LT26HVX Doc. No.： Version：1.0 Total Pages：34 Approvals Job Function Signature Date Project Manager R&D Dept. Manager EE Dept. Manager ME Dept. Manager Engineering Dept. Manager Sales Dept. Manager Quality Assurance Dept. Manager Author...

  • Page 2: Table Of Contents

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 2/34 Table of Contents Introduction……..…………..……………………………………… P3 1.1 Preface……………………………..……………………………………………… P3 1.2 Caution…………………………………..…...…………………………………… P3 1.3 Warning…………………………………………..………………………………. P3 System Block Diagram…………………………………………….. P4 2.1 System Block Diagram…………………………………………………………… 2.2 Connector Connection Diagram…………………………………………………. 2.3 Connector Pin Definition………………………………………………………...

  • Page 3: Introduction

    Be sure to read those manual before servicing. To assure safety from fire, electric shock, injury, harmful radiation and materials, various measures are provided in this Digimedia LCD TV. Be sure to read cautionary items described in the manual to maintain safety before servicing.

  • Page 4: System Block Diagram

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 4/34 2. System Block Diagram 2.1 System block diagram DigiMedia...

  • Page 5: Connector Connection Diagram

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 5/34 2.2 Connector Connection Diagram DigiMedia...

  • Page 6: Connector Pin Definition

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 6/34 2.3 Connector Pin Definition SYSTEM BOARD Function: VGA Signal In port Connector type : D-Sub Specification: CNNT-HD D Sub-H-F-3Row-15pin-Dip-BLU Pin Definition Pin No. Pin Name Description VGAR 75 ohm termination, 0.7Vp-p red signal VGAG 75 ohm termination, 0.7Vp-p green signal...
  • Page 7 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 7/34 RX1m TMDS LVDS input signal RX1p TMDS LVDS input signal No connection No connection GDC5V VCC 5V HOTPLG VCC 5V RX0m TMDS LVDS input signal RX0p TMDS LVDS input signal...
  • Page 8 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 8/34 Function: RS-232 port Connector type: Mini Din Specification: CNNT-Mini Din-H-F-８pin-12ψ-Dip Pin Definition Pin No. Pin Name Description No connection FlsahDL# Cable Plug In Detect No connection No connection...
  • Page 9 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 9/34 V5_IR 5V POWER Out Function: TUNER IN /AV IN Connector type: BOARD TO BOARD Specification: 2-557100-1 CNNT-Dip Right Angle-M - 80PIN-1.27mm-0.5A(Board to Board) Pin Definition Pin No. Pin Name...
  • Page 10 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 10/34 IF_TU1CVBS Tuner1 CVBS IN V12_SYS2 +12V OUT No connection No connection V12_SYS2 +12V OUT PC2DTV_TX PC TO DTV_TX IN PC2DTV_RX PC TO DTV_RX IN S2DTV_TX SYS TO DTV_TX IN...
  • Page 11 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 11/34 Software I2C Clk Software I2C data HWSDA hardwae I2C data HWSCL hardwae I2C clk CVBS_SC2 CVBS2 IN IF_YCVBS2 S-VIDEO2_Y In IF_C2 S-VIDEO2_C In ADC2 A/D conver DTV_L Audio DTV L ch in...
  • Page 12 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 12/34 TXE2N Negative LVDS differential data output TXE1P Positive LVDS differential data output TXE1N Negative LVDS differential data output TXE0P Positive LVDS differential data output TXE0N Negative LVDS differential data output +5.0V power supply...
  • Page 13 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 13/34 Function: Power Input 2 Connector type:M11-I25002 Specification: CNNT M 11PIN pitch 2.5mm DIP straight Pin Definition Pin No. Pin Name Description +V12 DC Power 12V IN DC Power 12V IN...
  • Page 14 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 14/34 AV BOARD Function: TUNER OUT / AV OUT Connector type: BOARD TO BOARD Specification: 2-557100-1 CNNT-Dip Right Angle-M - 80PIN-1.27mm-0.5A(Board to Board) Pin Definition Pin No. Pin Name...
  • Page 15 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 15/34 V12_SYS2 +12V IN No connection No connection V12_SYS2 +12V IN PC2DTV_TX PC TO DTV_TX OUT PC2DTV_RX PC TO DTV_RX OUT S2DTV_TX SYS TO DTV_TX OUT S2DTV_RX SYS TO DTV_RX OUT...
  • Page 16 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 16/34 Software I2C data HWSDA hardwae I2C data HWSCL hardwae I2C clk CVBS_SC2 CVBS2 OUT IF_YCVBS2 S-VIDEO2_Y OUT IF_C2 S-VIDEO2_C OUT ADC2 A/D conver DTV_L Audio DTV L ch OUT...
  • Page 17 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 17/34 Function: CVBS 1/2 and CVBS 1/2 AUDIO 1/2 In Connector type: RCA Specification: CNNT-RCA*6 yellow & white & red / yellow & white & red Pin Definition Pin No.
  • Page 18 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 18/34 Function: Component 1/2 (YPbPr1/YcbCr1) In Connector type: RCA Specification: CNNT-RCA*6 green & blue & red / green & blue & red Pin Definition Pin No. Pin Name Description...
  • Page 19 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 19/34 S2DTV_TX SYS TO DTV_TX IN RESETn RESET S2DTV_RX SYS TO DTV_RX IN MAIN_DE MAIN_DE pin PC2DTV_TX PC TO DTV_TX IN Sofeware I2C Clk PC2DTV_RX PC TO DTV_RX IN...
  • Page 20 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 20/34 KEYPAD BOARD Function: Keypad In Connector type: M15-I20001 Specification: CNNT M 15PIN pitch 2.0mm DIP Straight WST Pin Definition Pin No. Pin Name Description LED_B1 Signal for Indicator LED...

  • Page 21: Troubleshooting

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 21/34 3. Troubleshooting 3.1 No Power No Power Power plug is Check power plug is securely inserted securely inserted into the into the power power socket? socket. 1. Check power to system cable 2.Check system to keypad cable...

  • Page 22: No Sound

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 22/34 3.2 No Sound No Sound Please connection Check the speaker wire the speaker wire to connector to system system board. board? Confirm input Check the input source source and audio...

  • Page 23: No Source Input

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 23/34 3.3 No Source Input RGB or video source can’t be found Confirm input Check OSD select source and the correct? output of OSD select is correct. Check input source...

  • Page 24: Keypad Failed

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 24/34 3.4 Keypad Failed Keypad no response 1. Check the cable of keypad to system board. 2. Check keypad function. 3. If item 1 and 2 have no problem, please replace keypad board or system board.

  • Page 25: Ir Failed

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 25/34 3.5 IR Failed IR no response Reinstall F/W . Check F/W vision? Check remote control Change remote has energy? control battery. Check keypad board Please connection connection into system...

  • Page 26: Firmware Upgrade Applications

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 26/34 4. Firmware upgrade applications Update Firmware tools： 1.PC(Notebook) 2. transmission line as Figure1 MtkTool.exe , COMPR.DLL , 3.Sofeware( Figure1 MTKDLL.DLL) Cable switch: on D side (refer Figure2) Figure2 Insert the power cord and RS232 cable.
  • Page 27 Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 27/34 is 115200. Click the Browse of “Load Bin file option” to choose the correct firmware. Click the bottom of Upgrade, System will start upgrade firmware, when it fished the operation, list form has to show the “Finished”...

  • Page 28: Disaggregate Graphic

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 28/34 5. Disaggregate Graphic 5.1 Interface Module 1. Loosen 4 screws as red circles. 2. Pull the Interface module to the right side and pull up as blue arrow.

  • Page 29: Stand Module

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 29/34 5.2 Stand Module 1. Loosen 7 screws as red circles. 2. Take apart the Stand Module. 3. Loosen 7 screws as red circles. 4. Take apart the Stand Cover and Stand Support Metal 5.

  • Page 30: Back Cover

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 30/34 5.3 Back Cover 1. Please finish the step 5.1 and 5.2 to take apart the Interface module and Stand Module first. 2. Loosen 11 screws as red circles.

  • Page 31: System Board

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 31/34 5.4 System board Figure1 Figure2 1. Please loosen 8 screws as red circles of Figure1, the screw locations are around the Shielding, every side has 2 screws. 2. Loosen 1 screw as blue circles of Figure2.

  • Page 32: Keypad Board

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 32/34 5.5 Keypad board 1. Please loosen 5 screws as red circles. 2. Take off all of connector as blue circle. 5.6 Speaker Left side Right side 1. You need pull out of speaker wire with System board connector.

  • Page 33: Power Module

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 33/34 5.7 Power Module 1. Please pull out the power wires with Panel Inverter connector and System board connector as red arrows of Figure1 and Figure2. Figure1 Figure2 DigiMedia...

  • Page 34: Lcd Panel Module

    Doc No. Service Manual TITLE Version LCD TV For LT26HVX Page 34/34 5.8 LCD panel module 1. Loosen 10 screws as blue circles. 2. Loosen 4 screws as red circles. 3. Loosen 4 screws as blue arrows and blue circles.

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