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XOCECO LC-19HU56S Service Manual

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LCD TELEVISION
LC-19HU56S

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Summary of Contents for XOCECO LC-19HU56S

  • Page 1 LCD TELEVISION LC-19HU56S...

  • 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 or inserting/plugging in connection wire.
  • Page 4 in case of damage. 2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling. 2.12 For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual.

  • Page 5: Alignment Instructions

    Alignment instructions 1. Test equipment PM5518 (video signal generator) VG-848 (VGA, HDMI signal generator) VG-849 (digital video signal generator) CA210 (color analyzer) 2. Power test Connect main board, power board and IR board according to the wiring diagram, connect the power and press “standby”...
  • Page 6 ISP back to 0. If the picture can’t display when upgrading, it needs to solder JB1 on main board. Please unsolder JB1 again after upgrading. 4.2 Initialization Enter factory menu, select “OPTION”, “EEPROM” and “HOTEL OPTION” sub-menu, for adjusting items see table 4. Table 4 sub-menu adjustment Items Preset...
  • Page 7 b. Connect VG-848 signal of YPBPR to YPBPR terminal and input TIMING972(1080i/60HZ) 100% color bar of PAT976(include black/white bars), Enter ADC ADJ submenu, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according to the method of 4.4.1c) c.
  • Page 8 6.2 Main CPU software burn-in need write-protection, below is the setting: 6.2.1 If use ALL - 100: a) Enter into AUTO interface, select Config. Make sure Config must be selected when burn-in Flash. b) Click Config Setting, set Protect item to All Protect, set SRWD item to Enable, then click OK, write-protection setting is finished.

  • Page 9: 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 parallel cable (25 pins) and one VGA cable (15 pins), the parallel cable connects the PC and the upgrade instrument, the VGA cable connects the TV and the upgrade instrument.
  • Page 10 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 11 Select 6) Select the document then the window will appear as shown below:...
  • Page 12 7) Press “Auto” to select the writing function. Select the items shown in the picture above: (a) Read File...
  • Page 13 (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 14 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 15: 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 SAW filter 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 16: Block Diagram

    Block diagram (LC-19HU56S) EDID 24C02 24C02 EDID 24C02 HDMI FLASH YPbPr HDTV SW. EEPROM PI5V330 SCART1-RGB LCD TV CONTROLLER SCART1-V SCART1-L/R PANEL MST9E19B L/R-AV L/R-VGA L/R-YPbPr AUDIO AMP. TUNER PRE AMP TDA7266SA SPEAKER TV-SIF IF AMP TV-V TDA4470 2*AMP SCART1-V OUT...

  • Page 17: 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 18 2. TDA7266SA The TDA7266SA is a dual bridge amplifier.
  • 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 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 PIN 3(5V) of XS11 Press POWER button on the on main board is normal? unit or remote control and check the indicator.
  • Page 25 2.2. Raster appears, but no picture Check if the OSD menu Check if the unit button displayed and remote control are normally after pressing active? MENU. Check if all channels have no signal? VGA/YPBPR/SCART/HDMI Enter factory-menu, Which channel has initialize EEPROM, no signal ? Replace...
  • Page 26 2.3. No sound (Use TV input as an example) Check if PIN 3, 13 Check the waveform voltage NV12 of PIN 4, 12 of Check NV12 and normal? NV12 its periphery Check power supply Check N3 PIN 24 Check NS2 and its waveform.
  • Page 31 Tuner...
  • Page 32 IR & Key...
  • Page 33 Power...
  • Page 34 Back light...
  • Page 35 Appendix-A: Board list (9219HU5610) Name Main components & its number N3 TDA4470 （5274470001） Tuner Board 6HU0885510 NS2 MST9E19B （5270919002） Main Board 6HU0880110 NV12 TDA7266SA （5277266001） Key Board 6HU08805A0 IR Board 6HC0060910 Back Light Board 6LV0261410 Power Board 6HU0822010 Remote Control 6010N03401 RC-N34-0A Display Panel...

  • Page 36: Appendix-B: Exploded View

    APPENDIX-B: Exploded view (LC-19X56)
  • Page 37 PART LIST OF EXPLODED VIEW DESCRIPTION panel front cabinet speaker light conducting column IR decorative piece IR light conducting piece IR board main board interface baffle wall mounting bracket screw back cabinet stand screw power switch bracket conductive interleaver key board backlight board power board main board frame...
  • Page 38 9219HU5610 Ver.1.0...

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