Sanyo LCD-19XR7SN Service Manual
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Sanyo LCD-19XR7SN Service Manual

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Summary of Contents for Sanyo LCD-19XR7SN

  • Page 1 XR7SN 6 23...

  • Page 2: Table Of Contents

    CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………………… Trouble shooting…………………………………………………………………………… 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 instructions 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 damage.

  • Page 5: Alignment Instructions

    Alignment instruction 1 Alignment equipment PM5518 (video signal generator) K-7253 (VGA signal generator) CA210 (white balancer) IF signal generator Signal generator Oscillograph 2 Alignment flow-chart The alignment flow-chart is shown as fig-1 Write memory N300 and N400 To produce main board and power supply board Check power supply board and main adjustment All testing Connect with central signal source, then check each function of TV(Station...
  • Page 6 Press “INPUT”, “2”,”5”, “8”, “0” to enter the factory menu, the cursor lays on the first item “Whilt Balance”, then press “3” to access the sub menu, set “MulTunerChoice” to “2”, power off then power on again. b. AFT adjustment Make sure JB01 is disconnected and needn’t to input signal, press “INPUT”, “3”, “6”, “9”, “0”...

  • Page 7: Trouble Shooting

    Table 1 Display Format of PC Item Picture element clock H-SYNC V-SYNC Resolution Remark (MHz) (kHz) (Hz) 640 x 480 @ 60 25.175 31.469 59.900 800 x 600 @ 60 40.000 37.879 60.317 1024 x 768 @ 60 65.000 48.363 60.004 1024 x 768 @ 70 56.48...
  • Page 8 Unable to switch the power on Check to see if the power plug has been inserted properly into the socket. No picture and sound Check to see if the power supply of liquid crystal TV has been switched on. ( as can be indicated by the red LED at the front of the TV set) See if it’s receiving the signal that is transmitted from other source than the station...

  • Page 9: Method Of Software Upgrading

    Blur picture Check if the antenna cable is correctly connected. Of if it has received the right video signal. No sound Check if the “mute” audio frequency setting is selected. Check if the sound volume is set to minimum. Make sure the earphone is not connected. Check if the cable connection is loose.
  • Page 10 Properly set the path of RAMWrite "C:\isp_fastflash\Isp_parallel\TEMP_OBJECT\isptemp_ parallel.hex" and FastFlashWrite "C:\isp_fastflash\20y25.hex", save them and close. 4. Set the LCD to off. Connect the Y# updating board and PC with parallel cable. 5. Connect the VGA MONITOR interface on the Y# updating board with the VGA cable, connect the other end to the VGA interface of the LCD.
  • Page 11 Click the item of Parallel: Set Clock to 120000 Hz. 8. Click Batch, Select the path of the File: bat.txt Select bat.txt and click to open it: Click “OK” to start the process of burning the program. The following screen appears when the process if finished.

  • Page 12: Working Principle Analysis Of The Unit

    The unit working principle analysis For the PAL system, when the RF signal is input to the tuner, the turner generates IF signal. Then the IF signal goes through the pre-amplifying circuit and 38M SAW, the VIF signal and 1ST_SIF signal will be generated.

  • Page 13: Block Diagram

    BLOCK DIAGRAM...

  • Page 14: Ic Block Diagram

    As follows we are going to introduce the inner IC block diagram and function. 1. Inner block diagram of LA72700 stereo decoder:...
  • Page 15 Descriptions of the pins: Pin name Connections Pin name Connections PCSTFILT VCO PLL filter IIC data input PCPLDET Driving level test IIC clock input PISIF SIF signal test PCALCFIL ALC filter 25/26 R/L OUT TVF_R/L output SIF DEMOD SIF demodulator PCREC Reference voltage MUTE...
  • Page 16 Descriptions of the pins: Description Description VIF-IN1 VIF-IN2 VIDEO OUT(CVBS-TV) AFT-OUT SIF-OUT SIF-IN 3. R2S15900SP audio processor with surround stereo The audio signal from YPrPb/YCrCb or VGA input interface is selective sent to R2S15900SP through the multi-channel selector HEF4052BT, while the audio signal from the AV inputs is sent to R2S15900SP directly.
  • Page 17 4. Inner block diagram of AN5277 audio amplifier with single end and double channels 5. Inner block diagram of TPA1517 6W stereo audio amplifier...
  • Page 18 6. Inner block diagram of FLI8125 digital video processing IC The descriptions of the pins of FLI8125IC Pin name Connections Pin name Connections KEYA Key A S-video terminal identification KEYB Key B Pulse width adjustment AUD_SEL_1 RESETn Reset AUD_SEL_2 XTAL Resonator PBIAS Panel’s oblique line control...

  • Page 19: Wiring Diagram

    Wiring diagram...

  • Page 20: Troubleshooting Guide

    Troubleshooting charts This series models adopt built-in power. The power to the main board may be different when the unit adopts different panels or whether the audio amplifier is located on the main board or not. The following is the detailed power in different cases. Power socket Model...
  • Page 21 2. With picture and without sound when turning on: Increase volume; Check if the no sound channel from the signal check whether every input to sound processing IC IC15900 is normal channel has no sound Check whether the signal 15900(IC) or peripheral circuit output by 15900(IC) is does not work normally normal...
  • Page 22 5. Check flow of the power board (20”): Replace the fuse and check Power board damages Replace N501, D501 whether N501, D501 or fuse blows breakdown Check whether C512 has 18V Replace D502 Check whether pin1 of N501 has wave Check whether N502 is damaged Replace N502 Check whether N505, D507 is...
  • Page 28 APPENDIX-A: Main assembly LCD-19XR7SN MAIN COMPONENT AND IT'S NO. NAME Media box XI6160032000 N203 R2S15900 (5271590001) Main board XI6LY02501U0 N301 FLI8125 (5278125001) Key board XI6LY0040510 Backlight board XI6LY01214B0 Power board XI6LY01420B0 Remote control RC-Q32M-0A XI6010Q03201 Panel M190A1-L07 XI5203196504...

  • Page 29: Appendix-B: Exploded View

    APPENDIX-B: Exploded view LCD-19XR7SN...
  • Page 30 PART LIST OF EXPLODED VIEW DESCRIPTION Front cabinet Key board Speaker Panel Main board Back cabinet Stand Midea box Backlight board Power board User manual Remote Control...
  • Page 31 PART LIST LCD-19XR7SN ver. REF.No. PARTS No. DESCRIPION Q'TY REMARK Front cabinet XI5Q426R2160 XI6LY0040510 Key board Speaker XI6170788000 XI5203196504 Panel CMO M190A1-L07 XI6LY02501U0 Main board XI5HP26WH03D Back cabinet XI6151129030 Stand XI6160032000 Midea box XI6LY01214B0 Backlight board XI6LY01420B0 Power board XI5944034140...

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