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I have had a Hitachi CM721F monitor for about 3 years now, and the focus is getting fuzzy. Is there any way to adjust the focus?? The brightness is fine. Thanks!! Dave Barnes, davidb1569@aol.com

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If you can open your monitor you can adjust the focus in the back of the plyback of your monitor. But be careful to touch other parts of the monitor to avoid damage to the monitor in to your self. Use sharp thing or plastic to adjust the focus in the plyback. When you open the monitor cover you can find the plyback in the back end of the board of monitor usually color black and there are four wire connected to the board in the monitor yoke. Look for the two holes adjustment the upper one is for the bright and the lower one is for the focus. open the monitor and adjust the focus slowly again avoid to touch the other parts of the monitor. goodluck

Posted on Apr 16, 2008

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If you know where the fly back is, ok open the casing and see at the back of the fly back, there are two knobs, one for the focus and the other is for the brightness. Try twist both and see which one is for the focus. Ok, from the focus knob try adjusting until the fuzzy sight disappears. Try this, I usually do it to screens with blurry appearances.

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This is a common television flyback transformer , it has two potentiometers ( POTS ) variable resistors , how ever you wanna say it , the one above has 3 , one of them is the focus

you can use a plastic screwdriver or plastic wand , or small metal screw driver if nothing else

Here's a closeup of one that has only two potentiometers

ed6c36f.jpg
One of them is the focus adjustment

to adjust the focus/sharpness of the image you see on the screen

1. find which one is the focus , you will know because adjusting it out of calibration will cause
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Can you be more specific ?
The first step is to isolate the system at fault:
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Test it on another PC or
Try a different monitor on the same PC
Check monitor adjustments.
Check the video cable, try another one.

2) What kind of a monitor is it?
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3) Video card problem, possible but not as likely

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A fuzzy display is not likely to by caused by programs on your computer. Is this an LCD flat panel monitor or a regular CRT monitor?? If it's a CRT, the problem could be with the high-voltage power supply, which would need to be diagnosed by an experienced computer1.gif or electronics technician.

Check to see if there is a small focus knob on the back. If so try turning it back and forth three or four times to "clean" it....then adjust for correct focus.

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This sounds like a high-voltage power supply problem, which would need to be diagnosed by an experienced computer or electronics technician.

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Remove the rear cover and adjust the focus control on the flyback. Use a non-conductive probe, available as adjustment tools from any radio shack. On the FBT (Flyback Transformer) you have two protruding adjustments - one marked screen, the other focus. The screen adjustment increases the G2 voltage to the crt and brightens the picture by increasing the voltage exponentially. You don't want to adjust the screen voltage. The other is the focus, you can easily turn that clockwise or counter clockwise and watch the screen to set it at your preference.
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