Question about Compaq P110 21" CRT Monitor

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Compaq P110 21" CRT Monitor that is blurry in the middle of the screen and clear and crisp on the edge

I've purchased a second hand Compaq P110 monitor and recently realised that the centre of the screen is ever so slightly blurry and that the edge of the screen is clear. I have tried degaussing it and playing around with the settings to no avail. I am assuming that this is just the tubes getting old. Am I right to assume this? Is there anything else I should look at? Furthermore, if it is the tubes, should have them replaced? Where?

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As a result of aging monitor alignments drift, giving rise a a myriad of odd symptoms. Open the monitor up (of course it's got to be off), locate the scanning coils on the neck of the tube. Right there on are disk-shaped permanent alignment magnets. The scanning coils are electromagnets that produce the raster (scanning pattern), while the low-strenght permanent magnets allow the alignment to be varied ever so finely. Chances are that this alignment has drifted. Reconnect and turn on the monitor and with something being displayed, turn the disks one-by-one, observing the effect on the screen (a large mirror in front of the monitor would help much). Note that normally the disks are secured at the factory using hot glue. You may want to warm up the glue before starting the re-adjustment to make it easier to turn the disks. I am quite certain that this will solve your problem.

Posted on Jan 11, 2008


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