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Intermittent Horizontal Jitter in NEC Accusync 125F Monitor

I have an NEC monitor, a large CRT type, AccuSync 125F, that works perfectly except for an annoying occasional "jitter" where the horizontal size (width) of the screen fluctuates slightly. (You can see the left and right sides of the picture move slightly in and out, like someone is varying the Horiz Size setting.) I am experienced in electronic and TV repair, and I have gone through the main board and resoldered connections and most components in the horizontal oscillator, driver, driver transformer, and flyback transformer areas, and also resoldered many other connections including the pins on the yoke connector. Have done the same in the power supply module. I have repaired similar intermittent troubles in other computer monitors many times by carefully resoldering these areas, but there was no effect on my problem with this unit. Could this be a component rather than a solder joint? Any fault history or ideas on this issue? THANKS!

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  • zekeman Sep 06, 2007

    All good ideas. I did check the settings in the manual, also tried setting it back to all factory defaults. The horizontal jitter is intermittent, but it does not matter what screen resolution setting its running. I normally run 1024X768, but the problem occurs regardless of the scan rates or refresh rates selected. When I say "jitter" I mean a slight increase or decrease of width, often no more than a few milimeters to maybe 1/4 inch at the most. It is only noticeable as you look at the screen edges, more of a problem on documents than with gaming or video. It happens regardless of temperature, brightness, contrast, or any other user settings. I have tried it on multiple computers as well.

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You can get the user manual here; http://www.necdisplay.com/cms/documents/UserManuals/AccuSync125F_manual.pdf Check page 8 of the pdf (page 6 of the manual) - "GTF Auto Adjust". Try it on and off and see if you get a change. there is also a factory settings reset which could be worth trying (same page). Check the Moire settings on the following page (probably not going to help, but worth a try in case) I'm guessing you have tried to degauss already? - if not check page 10 (8 of the manual). Also page 10 is the global settings reset. Check page 14 for the resolution/refresh rate combinations that are supported and check (diagnosis on page 10) that you have the input set to one of the approved settings.

Posted on Sep 06, 2007

  • Nigel Ridehalgh
    Nigel Ridehalgh Sep 06, 2007

    You can also get the monitor driver here;
    http://www.necdisplay.com/SupportCenter/...

    Might be worth a try.

    After all that I would suggest getting an oscilloscope on all the power circuits - it could be external interference, could be something generated internally.

    Hope this helps :)

  • Nigel Ridehalgh
    Nigel Ridehalgh Sep 06, 2007

    PS - I couldn't find anyone else with the same issue for this model online

    :)

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Yes it could be the components check especially on capacitor and oscillators.

Posted on Sep 06, 2007

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