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PCWorkz

Monitors

The monitor is by far the item in our computer system that gets the most attention and for obvious reasons. We look into it all day and take it for granted all the work our monitors are performing. From their simple beginnings of monochromatic text display screens to the flat panel photo-realistic versions we have today the monitor has evolved to present to us picture quality that is unprecedented in quality, color, and effect. With these advancements comes problems and this page we present to you some of the more common problems that you may run into, and as always if this page does not contain information that you are looking for please feel free to mail us and we will respond to your specific question.

Q&A

My image appears to flip or scroll vertically?
A synchronization problem is in your vertical raster circuit. Begin by checking the video cable to be sure that it is installed and connected securely. Cables that behave intermittently (or that appear frayed or nicked) should be replaced. If the cable is intact, suspect that the problem is in your vertical circuit. If a vertical-sync (or “vertical hold”) adjustment is on the raster board, adjust it in small increments until the image snaps back into sync. If no such adjustment is on your particular monitor, try re-soldering all of the connections in the vertical-processing circuit. If the problem persists, replace the vertical oscillator IC or replace the entire raster board.

My image appears to flip or scroll horizontally?
A synchronization problem is in your horizontal raster circuit. Begin by checking the video cable to be sure that it is installed and connected securely. Cables that behave intermittently (or that appear frayed or nicked) should be replaced. If the cable is intact, suspect a problem in your horizontal circuit. If a horizontal-sync (or “horizontal hold”) adjustment is on the raster board, adjust it in small increments until the image snaps back into sync. If no such adjustment is on your particular monitor, try re-soldering all of the connections in the horizontal-processing circuit. If the problem persists, replace the horizontal oscillator IC or replace the entire raster board.

My display appears wavy?
Waves appear along the edges of the display as the image sways back and forth. This is almost always the result of a power-supply problem—one or more outputs is failing. Use your multimeter and check each supply output. If you find a low or absent output, you can proceed to troubleshoot the supply or you can simply replace the supply outright. If the power supply is integrated onto the main PC board, you will have to replace the entire main PC board.

My display changes color, flickers, or cuts out when the video cable is moved?
Check the video cable’s connection to the video adapter at the PC—a loose connection will almost certainly result in such intermittent problems. If the connection is secure, an intermittent connection is in the video cable. Before replacing the cable, check its connections within the monitor itself. If connections are intact, replace the intermittent video cable outright. Do not bother cutting or splicing the cable—any breaks in the signal shielding will cause crosstalk, which will result in color bleeding.

 

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