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XOCECO LC-19HU26 Service Manual

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LCD TELEVISION
LC-19HU26

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Summary of Contents for XOCECO LC-19HU26

  • Page 1 LCD TELEVISION LC-19HU26...

  • Page 2: Table Of Contents

    CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………………… Method of software upgrading…………………………………………………………….. Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..………………………………….………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………………………. Troubleshooting guide ………………………………………………………………..…… Schematic diagram………………………………………………………………………… APPENDIX-A: Assembly list APPENDIX-B: Exploded View...

  • Page 3: Safety Precautions

    Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety precautions 1. Instructions Be sure to switch off the power supply before replacing or welding any components inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;...
  • Page 4 would be unable to work and no way to get it repaired. If the connection wires, connectors or components fixed by the thermotropic glue need to disengage when service, please soak the thermotropic glue into the alcohol and then pull them out in case of dagame.

  • Page 5: Alignment Instructions

    Alignment instructions 1. Test equipment PM5518 (video signal generator) VG-848 (VGA and HDMI signal generator) CA210 (white balancer) 2 Alignment flow-chart The alignment flow-chart is shown as fig-1 Check DDC, FLASH and POWER control IC Combined test for general assembly Factory initialization setup IF channel AFT voltage of TV and AGC voltage White balance adjustment...
  • Page 6 BACK LIGHT Software auto preset according the screen ALL COLOR 1: white balance of each channel auto offset based on the HDMI white balance 0: white balance of each channel adjust the offset base separately EEPROM-MEMORAY > EEPROM Initialization (operate when EEPROM data chaos) RECALL 3.2 Adjustment for AFT voltage and AGC voltage of IF channel in TV 3.2.1 IF AFT adjustment...
  • Page 7 5 Performance check 5.1 TV function Enter searching menu → auto search, connect RF-TV terminal with central signal source and check if the picture is normal, if there are channels be skipped. Check TXT and parental control. 5.2 AV, YPbPr terminals Input AV/S, YPbPr/YCbCr HD signal, check if it is normal.

  • Page 8: Method Of Software Upgrading

    Method of software upgrading 1. The tools and software demanded 1) Please confirm that PC has the software of ISP_TOOL and install the parallel interface drive program Port95nt. 2) ISP_TOOL icon is bellow: 3) One serial cable (25 pins) and one VGA cable (15 pins), the serial cable connects the PC and the upgrade instrument, the VGA cable connects the TV and the upgrade instrument.
  • Page 9 Note: if it appears error, check the connection wires and check if ISP item of the factory menu is set to 1, if not, please set it to 1. 4) After connection is done, it needs to read the Binary document. Press “Read” as shown below: 5) Search the document needed to write in the “Read”...
  • Page 10 Select 6) Select the document then the window will appear as shown below:...
  • Page 11 7) Press “Auto” to select the writing function. Select the items shown in the picture above: (a) Read File...
  • Page 12 (b) Program (c) Exit ISP (d) Erase Device (e) File Area 8) Press “Run” to begin the writing program, wait till the blue bar is complete. After writing, it will display OK: If there is error appeared (shown as below), press “Run” again to rewrite the program till it is success.
  • Page 13 Note1: keep the connection well and don’t cut off the power during the writing process. Note2: the writing speed can be adjusted as shown below. Select “Config” then adjust Speed BAR, the value is bigger the speed is faster. But it is easier to appear error when increase the speed, so it need to select a suitable speed according the PC.

  • Page 14: Working Principle Analysis Of The Unit

    Working principle analysis of the unit The RF signal received by antenna will be sent to tuner TUN1, then IF signal will be obtained through high amplifier and mixed frequency, through pre-intermediate amplified by V15, then it will be sent to acoustic surface-wave Z17 to do IF filter and get better IF characteristics, then it will be sent to N3 (TDA4470) to do intermediate amplification, phase-locked loop VCO and synchronous wave detection to get video signal TV-V;...

  • Page 15: Block Diagram

    Block diagram POWER MEG. ATMEG8L EDID 24C02 FLASH YPbPr HDTV SW. EEPROM PI5V330 SCART1-RGB LCD TV CONTROLLER SCART1-V SCART1-L/R PANEL MST9E19A L/R-VGA L/R-YPbPr PRE AMP TUNER PRE AMP LM358D AUDIO AMP. R2S15102NP TV-SIF IF AMP TV-V TDA4470 SPEAKER 2*AMP SCART1-V OUT PRE AMP TV-L/R SCART1-L/R OUT...

  • Page 16: Ic Block Diagram

    IC block diagram 1. MST9E19A The MST9E19A is a high performance and fully integrated IC for multi-function LDC monitor/TV with resolutions up to SXGA(1280X1024)/WXGA+(1440X900). It is configured with an integrated triple-ADC/PLL, an integrated DVI/HDCP/HDMI receiver, a multi-standard TV video and audio decoder, a video de-interlacer, a scaling engine, the MStarACE-3 color engine, an on-screen display controller, an 8-bit MCU, and a built-in output panel interface.
  • Page 17 2. R2S15102NP R2S15102NP is a Digital Power Amplifier IC developed for TV. R2S15102NP can realize maximum Power 10W X 2ch. (VD=24V, THD=10%, SE) at 8Ω load. It is possible to replace from the conventional analog amplifier system to the digital amplifier system easily.
  • Page 19 3. TDA4470 The TDA4470 is an integrated bipolar circuit for multi-standard video/sound IF(VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processed all TV video IF signals with negative modulation (e.g., B/G standard), positive modulation (e.g., L standard) and the AM, FM/NICAM sound IF signals.

  • Page 21: Wiring Diagram

    Wiring diagram key board IR board power board panel main board high frequency board...
  • Page 22 Trouble shooting 1. Fault clearance Before servicing please check to find the possible causes of the troubles according to the table below. 1.1 Antenna (signal): Picture is out of focus or jumping Bad status in signal receiving Poor signal Check if there are failures with the electrical connector or the antenna.
  • Page 23 signal types. Picture too bright and there is Check if the contrast setting is too high. distortion in the brightest area Possibly the output quality of DVD broadcaster is set too high. It maybe also due to improper terminal connection of the video frequency signal in a certain position of the system.

  • Page 24: Troubleshooting Guide

    2. Troubleshooting guide 2.1. No raster Turn-on power supply, check if the red indicator is light in the STANDBY? Check if XB1 PIN3(5V) of Press POWER button in the main board is normal? unit or sensor control and check the indicator. blue Check if the PIN9,10 of XB1 Check STANDBY circuit of...
  • Page 25 2.2. Raster, but no picture Check if the unit button Does display remote control menu in screen when operation? press menu button? Check channels have signal? VGA/YPRPB/SCART Enter factory-menu, Which is no signal initialization EEPROM, of channels Replace then turn off the TV, main board turn on again, display Replace...
  • Page 26 2.3.no sound (TV input) Check if PIN2, 9,10 and Check PIN5 14 voltage of NV1 is PIN11 output wave of Check NV1 and its normal? periphery Check power supply Check PIN24 wave of Check NS2 and its periphery Check N3 and its Check PIN11 wave of periphery TUN1...

  • Page 27: Schematic Diagram

    main board page 1...
  • Page 28 main board page 2...
  • Page 29 main board page 3...
  • Page 30 main board page 4...
  • Page 31 main board page 5...
  • Page 32 main board page 6...
  • Page 33 page 7...
  • Page 34 back light board page 8...
  • Page 35 APPENDIX-A: Main assembly 9219HU2616 MAIN COMPONENT AND IT'S NO. NAME Media box 6160036000 High frequency board 6HU0065510 TDA4470 (5274470001) MST9E19A (5270919001) Main board 6HU06401S0 R2S15102NP (5271510201) Key board 6HU0060510 Backlight board 6HA0121410 Power board 6HU0042010 RC-Y35-0A Remote control 6010Y03502 Panel 5203196503 M190A1-L02...
  • Page 36 (LC-19X26)
  • Page 37 PART LIST OF EXPLODED VIEW LC-19X26 NO. PART NO. DESCRIPTION 585040805B DECORATIVE BOARD 5Q426R002C FRONT CABINET 58B0A25710 USB BRACKET 6170661000 SPEAK ASS'Y KEY BOARD ASS'Y 5293000042 POWER SWITCH SCREEN 6153080200 PANEL HOLDER ASS'Y MAIN PCB ASS'Y 584095301A AV BAFFLE 6160036000 MEDIA BOX 5830099110 BACK CABINET (RIGHT)
  • Page 38 9219HU2616 Ver.1.0...

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