LG Flatron W2361V PSU Troubleshooting

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  • electrophoros
    New Member
    • Jul 2022
    • 4
    • Greece
    #1

    LG Flatron W2361V PSU Troubleshooting

    Hi everyone.

    I am trying to troubleshoot this computer screen which went black and won't power on after a power surge.

    I have measured the output voltages and there seems to be proper voltage pressence on the 5V outputs, there is no voltage on the 22V outputs and I am unsure of what I should be measuring on ADIM, BDIM, EN and OLP.


    There also doesn't seem to be any voltage on the backpanel outputs:


    I have already identified and replaced two bulging electrolytic capacitors, and there is voltage after the fuse.

    I am not sure how to proceed next. Any tips appreciated.
    Tags: None
    • electrophoros
      New Member
      • Jul 2022
      • 4
      • Greece
      #2
      Re: LG Flatron W2361V PSU Troubleshooting

      I just noticed that my picture links don't show up. Adding them here

      Pinout


      LCD panel outputs


      Board top view

        Comment

        • mikey5791
          Badcaps Veteran
          • Dec 2014
          • 504
          • Malaysia
          #3
          Re: LG Flatron W2361V PSU Troubleshooting

          Make sure all the diodes and transistor are in good working condition and not shorted.
          Btw, did you checked the middle 8 pin chip?

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9514
              • Canada
              #4
              Re: LG Flatron W2361V PSU Troubleshooting

              From what I can tell, If you have the +5v you should also have the +22v, both are supplied by the same transformer, so check the connections on the transformer and D201,D205.

              I would start by replacing C103, C105, they are very likely the main problem with the power supply

              I would replace all the electrolytic caps except for C101, it should be ok.
              Last edited by R_J; 07-31-2022, 10:33 PM.

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