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LG Flatron W2361V PSU Troubleshooting

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    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.

    #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

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      #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


        #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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