Question about Samsung SyncMaster 931B 19" LCD Monitor

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931B tries to come on but shuts back off

I turn the monitor on and it tries to come on but simply flashes to the windows login screen for a split second then turns off again right away. It repeats this over and over every 2 or 3 seconds. When it turns off you can see its trying to display the "no signal" detected but the screen goes black before you can actually read it. This just started happening, its not my computer or video card they all work fine. I suspect the power supply board or the little board where the video connector plugs in is faulty?

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  • Anonymous Apr 03, 2009

    I took off the power board and replaced 3 caps that had bulging tops and now it all works fine.

  • Anonymous Apr 03, 2009

    I removed the power board and replaced 3 suspicious looking electrolytic caps with bulging tops and now it works perfect. :)
    2 caps were 820 uF 25V which I used 1000 uF 25V instead.
    The other was a 470 uF 25V which I had a direct replcement.

  • Anonymous Apr 03, 2009

    see comments above

  • Anonymous Apr 22, 2009

    Same here. Slight whistle from the PSU as well. Showed a reduced brightness display and then shut off.
    Problem solved by changing 3 capacitors (also bulging visually).
    The ESR of the faulty caps: about 5 ohms.
    Seems to be a common problem with cheap Chinese power supplies.


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Problem solved by changing 3 capacitors (C112, C113, C316).

Replace the 470uF 25V with a good quality low ESR type and the two 820uF 25V with 1000uF 25V low ESR types.

The 1000uF caps should be 10x20 in size, however I managed to get 13x20 caps in, but it was a bit tight.

Posted on Apr 22, 2009

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