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Samsuung Syncmaster 244T Power fault.

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    Samsuung Syncmaster 244T Power fault.

    Hi guys,
    I hope you can shed some light on my problem:

    my display went black several weeks ago. Green led was dead too.

    So I've replaced all my capacitors with new rubycon caps (or at least I think they are, but I bought them on internet so not so sure).

    After that, my monitor turned on immediatly, all perfect.

    But now I can hear a very low humming (60 hz, I think) coming from what I think is a metallized film capacitor.

    I'm absolutely sure the sound/vibration come from that component.

    The capacitor is parallel to the 230v DC, right after the rectifier.

    It can be a normal situation? I don't know if that hum was there before the fault, because I really never pay attention to it....
    Attached Files
    Last edited by eolonano; 04-08-2017, 08:29 AM.

    #2
    Re: Samsuung Syncmaster 244T Power fault.

    Maybe a bad solder joint? commonly this kind of sound comes from coils/transformers if your new caps have a very different specs, it might cause weird issues (maybe related to the main cap).

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      #3
      Re: Samsuung Syncmaster 244T Power fault.

      I'm checking; I've measured the voltage on that film capacitor and I read 337 DC (????) and I read about 80 volt AC.

      I theory in that part of the circuit the voltage has to be DC, because it's right after the rectifier.

      It can be the rectifier? I don't really know much about switching power source unit; this AC voltage can come from the 230AC not rectified properly, or it can bounce back from the DC to AC conversion?

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        #4
        Re: Samsuung Syncmaster 244T Power fault.

        Try to locate the schematic first.

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