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Westinghouse Computer Monitor LCM-20v5 Posted by: Daryl Tanner monitor is not wanting to come on right away when i turn on it takes some times 8 time to turn it off and on before it will come on When I turn my computer off for the night. The next morning when I turn it on the i can see the picture for just a second and then it goes black and want come on so I can see what is on my computer. Every time I hit the on button I see the picture on my computer for just a second and off it

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  • dtanner449 Jul 14, 2009

    Actually, Ginko, this is the same information I got off the "badcaps.net" forum. I was hoping to get more detailed help if I paid for it.



    For example: If I have to replace the caps, what are the specific capacitor model numbers in my particular model of Westinghouse monitor and what are the equivilent numbers for a better brand of capacitor?



    Daryl

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  • Westinghouse Master
  • 19,396 Answers

Common reason for this kind of trouble is a faulty circuit, where a defective component cause electrostatic charges accumulating on capacitors.
When you keep clicking the start, or leave the monitor resting overnight, you drain power, and unit restarts.
Try leaving the monitor unplugged from main overnight and see if this can help.
Also test the monitor on a different computer, as a shorted video cable can cause similar problems.
Parts that can commonly given this kind of problem are the Power supply board and the Inverter board. Sometimes a faulty digital controller board can cause the same problem.
If the power adapter is external , this is easy to test using a multimeter to read DC voltages. Volts must be within halv volt difference from value stated on power adapter label.
An internal PSU is more difficult to test, and for safety reasons the job should be done by a tech.

Test starts with a visual inspection, looking for bulged or leaking capacitors. If there is nothing at a glance next step is testing voltages out and then testing components.
Same operations must be done on the inverter.
Inverter and PSU are high voltage boards.
Regards.

Posted on Jul 14, 2009

  • Ginko
    Ginko Jul 14, 2009

    Hy Daryl if this is the same info that you received in the forum, that means that the forum guys gave you the right info.


    This is what we do at a repair shop in this case.


    To access the board you need to remove the plastic cover at the back, unding few screws.


    You immediately see the (5 I think) big electrolitic caps when you access the PSU board. Value of capacitors is written on the components, I think they should be 1000uF and 220uF, 25V caps. PSU board part number is printed on the board.
    The PSU board has 4 wires connected.


    Resoldering capacitors requires experience and precision, or the repaired part can short out.
    If you have not done similar repairs before you should not attempt DIY. Capacitors must be allowed discharge before testing or replacing.


    The schematics for the monitor are available on service manual from factory, but manual for this model is difficult to find, I could not find it online.
    Repairing a PSU board is a relatively simple job for a technician, for this reason we would not use schematics in this case.


    Hope this helped.


    Regards.



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