Question about LG Flatron 915FT Plus (White) 19" CRT Monitor

1 Answer

Image width instability

I cannot bring myself to chuck this perfectly good monitor away - as advised! No-one local seems to consider it (or any CRT monitor for that matter) an economic repair. The problem started intermittently a couple of years ago when, apparently when warmed up, the monitor gave a "click" (relay?) sound from the back and the screen went "wide" with its edges outside the physical limit of the crt. The only way to see the edges was then to re-size the image using the touch controls on the front. This adjustment was obviously well outside the calibrated width range and the edges of the image are now cylindrically distorted. The problem became less intermittent as time went on and now the monitor normally starts "wide". I have taken the cover off (with due consideration of CRT HT issues) and can see no obvious signs of component overheating or other failure. The monitor also had image flicker problems which are probably are a related issue - they seem to have stopped now that the width fault has established itelf! Any ideas?

Posted by Robert Holzer on

  • Robert Holzer May 27, 2007

    Thanks - that was an amazingly fast response! I tried what you suggested a while back and have done so again on your advice. The image seems stable at both higher and lower res values/formats, but the one we prefer is the unstable one. I suppose that the fault is with the circuitry that controls the format/resolution, but to be honest I am not really sure what to look for to trace the fault. If you have any further thoughts I would be grateful to hear them. Thanks again.

  • Robert Holzer May 29, 2007

    Actually, banging on the side of the monitor did originally partially sort the problem - for a while. I suspected a dry/broken solder joint and months ago took the cover off and in one circuit module found a bady soldered joint - which I resoldered. It seemed to reduce the problem, but did not fix it entirely. I concluded that the bad joint was just incidental. Thanks again for your observations.



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Marty marty

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On the pc, choose a 640x480 vga screen...if ok, then gradually build higher res screens from there

Posted on May 27, 2007

  • Marty marty May 29, 2007

    try tapping quite hard on the side of the monitor....any changes? if not, the problem may be with the vertical drive circuit as it cannot "stretch" the image from the top to the bottom. As last resort, search ebay for AS-IS items and get one for part-swapping



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