My monitor has a nasty habit of going out any time it feels like it, just like somone has switched a light off. It happens most of the time shortly after I start the computer but it has happened much later in the day. The off/on light remains on so I turn it off and on again and the screen lights up, for maybe 20 or 30 seconds, only to return to black shortly afterwards. It's an LCD and it's about 2YO. Would appreciate any help, Thanks for your time.
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Re: 17" Monitor keeps going black
It's a very common problem.
LCD's use four small Cold Compact Fluorescent bulbs to back light the display. (thats what gives the LCD it's brightness allowing you to see it)
The inverter board runs these lights and when they go bad they will typically show symptoms like you have or the monitor power light comes on and you have either no display or a very dim display.
If you ever have one that has no display but the power light is on you can check by shining a flashlight directly into the LCD from the front (right into the screen) if you can see an image then it's either the inverter board (most likely) or the CCFL bulbs have gone bad.
The inverter board and CCFL's are replaceable.
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Your monitor may have an option to set it as "manual" or "auto". If set in manual, you will have to turn off the monitor power switch each time. If it has the "auto" setting , it should shut off or "go to sleep" when it detects no input signal.
This is a problem with the power supply unit inside the monitor, there is no easy way out here. If you keep on using your monitor like this eventually it won't switch on no matter how long you wait. Keep on using it like this for the time being without switching off anything but ultimately you will have to take it in for repairs or otherwise purchase a new screen..
The clipping sound is the internal safety switch that keep shutting down the monitor. It means there is an internal problem on the main board (overvoltage, bad component , short). Try unplugging power cord and leaving it unplugged two or three hours, this will reset ICs by draining power completely from circuits, it is called hard reset, it rarely works. CRT monitors waste up to 15 times more energy than TFT screen, if your CRT starts giving troubles, then it is a good time for upgrading it to a new TFT. 17'' start at $120
You are right in assuming it to be the monitor.
It is the inverter circuit that powers the backlights inside the LCD.
No backllight, no view. If you shine a bright light into the screen you will see it is still working, just not visible.
The Viewsonic range of monitors have a habit after several years use developing bad capacitors that need to be replaced. It's something that happens to most LCD's and alot of other electronics.. so not a design flaw, just age.
If you have modest electrical knowledge then its an easy job, If not then take it to your local TV repairman and have them do it. It should not cost alot to have it done. The main expense in this case is the labour.
Call a few shops in the area and get rough quotes to have it done. You will be surprised how much the cost can vary for the same simple job.