Question about NEC AccuSync 90 19 in.CRT Conventional Monitor

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Vertical distortion Monitor works fine but after a few minutes the image drops to the lower half of the screen. Vertical sync appears to be the problem. Need schematic to find component to replace. magalluzzox@hotmail.com

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  • radar66 Sep 12, 2008

    No problem with another monitor. Freeze spray an option. Brogan maintenance seems to work. Slapped the monitor on the side and it corrected the problem. Will check all connections. Plugs, CRT connector, etc.
    P.S Have two motherboards to recap now.

  • rich medrano
    rich medrano May 11, 2010

    Have you tried a different monitor to be sure it's not a source problem? Don't know easily how to find a schematic. You could get some freeze spray and carefully spray components. It could also be a power supply issue.

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With extreme care I have used a non-conductive tool, like the back end of a screw driver and flexed the circuit baord on a TV and eventually traced the problem to a cracked solder joint near the high voltage transformer. Slightly tapping on the tops of capacitors using the above method may also help. Working without a schematic is tough.

Posted on Sep 20, 2008

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Try to replace all capacitor in vertical section a leak capacitor can make your screen to shrink....

Posted on Sep 12, 2008

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