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Intermittent Horizontal Jitter in NEC Accusync 125F Monitor

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\015 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.)\015\012 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!\015

Answers :

You can get the user manual here;\015\012\015\012http://www.necdisplay.com/cms/documents/UserManuals/AccuSync125F_manual.pdf\015\012\015\012Check 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).\015\012\015\012Check the Moire settings on the following page (probably not going to help, but worth a try in case)\015\012\015\012I'm guessing you have tried to degauss already? - if not check page 10 (8 of the manual).\015\012\015\012Also page 10 is the global settings reset.\015\012\015\012Check 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.
Yes it could be the components check especially on capacitor and oscillators.
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