52 Focus Adjustment:
Description
This article is from the comp.sys.ibm.pc.hardware.video Frequently Asked Questions, by Michael Scott with numerous contributions by others. (v1.0).
52 Focus Adjustment:
One of the most common complaints is that the monitor is not as crisp as it used to be - or just not as sharp as expected.
Assuming that the focus has just been gradually getting worse over time, tweaking the internal focus control may be all that is needed.
On most monitors, the flyback transformer includes two control - FOCUS and SCREEN. The one you want is, of course, FOCUS.
Safety: as long as you do not go near anything else inside the monitor while it is on AND keep one hand in you pocket, you should be able to do this without a shocking experience.
Plug it in, turn it on and let it warm up for a half hour or so. Set your PC to display in the resolution you use most often. First turn the user brightness and contrast fully counterclockwise. Turn brightness up until the raster lines in a totally black area appear, then back a hair until they disappear. Then, turn the contrast control up until you get a fairly bright picture. Fully clockwise is probably OK. Adjust FOCUS for generally best focus. You will not be able to get it razor sharp all over the screen - start at the center and then try to get the edges and corners as good as you can without messing up the center too much. Double-check that the focus is OK at your normal settings of brightness and contrast.
The SCREEN control adjusts background brightness. If the two controls are not marked, you will not do any damage by turning the wrong one - it will be immediately obvious as the brightness will change rather than focus and you can then return it to its original position (or refer to the section on brightness adjustments to optimize its setting).
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