Question about Mitsubishi Diamond Pro 900U 19" CRT Monitor

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Focus My monitor is crystal clear in the centre from top to bottom but as u look to the left side it becomes blurred. It appears to get uniformly worse from top to bottom as you look from the centre... The right side may be a little out but not easy to see. I was wondering if the monitor is suffering from focus drift and is there a pot inside that can be adjusted to compensate. Degauss does not help, there are no magnets near the monitor, and it does not get worse or better when turned on from cold or if left on for hours...

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Hi,

Most 17 inch monitors upward have two (2) focus adjustments. They are located at the back of the Flyback Transformer (FBT) together with the screen control. They tend to "drift" as you have posted after some time of usage. In the absence of calibrating instruments, you simply have to wing it when adjusting. It might be of help if you use a squarish mirror to view the front while adjusting the controls at the rear. Of course the usual precautions apply when working with live units especially within the high voltage area.

Should you not be comfortable opening the unit, adjusting while "live", you may need to seek the services of a qualified professional.

In some extreme case, no adjustment could and would correct a problem if the CRT has already developed some form of ion burn on its mask and therefore would require replacement. At times, you may need to consider the cost of repairs (parts & service) as well as the down time which may negate justification for repairs and therefore the prospect of a new monitor might be better off.

Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

Posted on Feb 01, 2008

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