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Monitor loses all power and blackscreens

My monitor randomly shuts down internally. Sometimes its only for a few seconds, sometimes for several minutes or more. The screen and all LEDS go black. It then reboots and may go for minutes, hours or days. The power supply is external and feeds a steady 12.1V. The problem doesn't seem to be heat related.
I could probably fix it (I'm an electrical engineer) but I can't get the back off!
How do I do that (for a start!)

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  • steve_eckett Dec 11, 2008

    It's definately a hardware poblem unrelated to the OS. It has occurred at idle, and at full typing!
    I finally got the case off and manually inspected all components, and gave them all a good prod in case of bad joints etc. I suspect the cpacitors but they look fine. I've been running it naked for a couple of days waiting for it to fail again, but it hasn't!



  • steve_eckett Feb 06, 2009

    Update:
    I eventually found the problem. There is a small toroidal inductor that forms part of a resonant circuit that sets the oscillator frequency of the five-pin sm power converter chip. One end was imperfectly soldered and went intermittently open-circuit. The joint was visually perfect but the fault was found with an ohmmeter. The coil is wound with enameled wire which is notoriously difficult to solder - I'd guess the problem had been there from the factory. Careful re-soldering has cured the issue and the monitor has now run without fault for five weeks.


  • Solo4665
    Solo4665 May 11, 2010

    Have you got any power saving features enabled from the operating system?  Does it "reboot" when you move the mouse again?

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I've experienced the same problem in a large environment and found that capacitors within the pc itself were swollen...replacing the motherboard solved the issue.

Posted on Dec 10, 2008

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