Question about Compaq V90 19" CRT Monitor
I Have Compaq V90 19 inc monitor when i increases it's brightness and contrast its display is coming and going. when i decreases it's to loo then it becomes stable.
There are a couple of possibilities and none of them lend themselves to DIY repair.
It can come from arcing in a component trying to fail; you may be able to hear this (if present) by listening closely near the rear of the housing, preferably in a quiet room and near the cooling slits.
Another potential source is what is called a 'cold solder joint' that may look and even measure OK until a little more current is flowing through it.
Neither one is something most users should try to deal with unless you have some technical background since having a powered, open, circuit board can be very dangerous; there are voltages greater than 20,000 volts and several other innocent looking places with many hundreds of volts with sufficient current available to kill.
The only thing you should try on your own is cleaning the guts free of built-up dust that naturally accrues in any high voltage device. Pull the AC cord, ignore overnight, then remove the few screws you will find, often behind the bezel and perhaps a couple in the rear near power cord and video connections/cable.
I like to do this with the monitor laying face down on a soft surface so with most housing you can simply lift the housing free of the bezel and put it aside. With a vacuum cleaner and a clean paintbrush, clean all the areas you see that have obvious build-up of 'fur.' Try not to disturb any parts in the process though, some are fragile. If the bottom of the circuit board is visible, clean that too and look for any dark brown areas caused by heat. These can become conductive if approaching black in color.
You will see a fairly fat cable leading from a black lump on the circuit board; this is a transformer responsible for producing the 20-25,000 volts. If the unit has been off overnight, you can clean enthusiastically around the rubber cap you see on the side or top of the picture tube; this is a good leakage point for high voltage.
If you do this and it didn't help, you will have to find a surviving CRT monitor tech to take it from there.
Posted on Sep 13, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
You can adjust the
brightness and contrast of your monitor to improve the readability of text and
to make digital pictures appear more like they'll look when printed.
To improve the results
when adjusting the brightness and contrast settings for your display, use
Display Color Calibration. (Display Color Calibration helps you adjust these
color settings and others.) For more information about calibrating your display
color in Windows,
see Calibrate your display.
The way you adjust
brightness and contrast varies and depends on your specific display.
Brightness and contrast buttons on the front of the monitor. Some monitors have brightness and contrast
controls on the front and use the standard symbols shown in the following
On-screen menu. You can change the brightness and contrast settings for some
displays by using an on-screen menu, and then setting the brightness and
contrast in the resulting menu. Many times, you can view the on-screen menu by
pressing a button-possibly labeled Menu-on the front of the monitor.
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