Question about ViewSonic OptiQuest Monitor

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Screen goes blank after few seconds

Lcd comes on with a hum and goes blank after a few seconds

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  • rdeno121212 May 01, 2008

    My screen goes black after a few seconds and will not come back on unless I turn it off. When I turn it back on it does the same thing. I can not get it to come on at all when I connect it to my laptop like I have been able to do with other monitors. I would appreciate any help with this problem.

  • paulnebusol Apr 30, 2009

    I have the same problem but it is not the board or the power supply as I ruled them out by attaching the monitor to anoth PC and laptop (not at the same time)

    This is definitely a monitor problem

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Yeah, for most of you it's definitely the caps. The three that are 470uF and the one 330uF.

Don’t just replace them with new ones of the same type, they will just blow again. Use ones with a higher voltage rating. you can also use ones with slightly higher uF (they are just output caps for the SMPS). Mine are at like ~530uF and its holding strong.

If your having trouble with brightness there is a jumper that lets you change the amount of power going to the cold cathode bulbs. It is right next to the three bigger caps. it has three settings, 6.5mA, 7mA, and 7.5mA. it should be set to 6.5mA by default. The bigger numbers are brighter, but remember to crank your brightness all the way down before changing this jumper as 6.5mA with maxed out user brightness is the same thing as 7mA all the way down.

These are good monitors as far as stats and usability. They just have defective parts. I was amassed with how "defined" the picture is per-pixel considering it's VGA.

-Oblivion

Posted on May 06, 2009

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Hi guys

if your diplay goes blank afeter few second most of the time th proplem is located in the power supply area.
I had the same issue on my monitor and I have fix it !
what I recommand you to do is :
on the power supply check the 470 mfd capacitors they are probably almost dead also the 330 mfd close to the little coil and the 10 mfd close of the heat sink

the cost of the repair is approx 5$
hint: when you replace the capacito try to buy 105 instead of 85 and if you have enough phisycal space take 50V instead of 25

this way the capacitors will last a little bit longer

Posted on Feb 01, 2009

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My screen goes black after a few seconds and will not come back on unless I turn it off. When I turn it back on it does the same thing. I can not get it to come on at all.

Posted on Nov 14, 2008

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I have had this same issue with a few of the Optiquest Q7 monitors. These seem to be very crappy and I have seen nothing good written about this monitor. I have a few I use that have the flicker on the screen which I have only gotten two of them working.

If the Screen goes comes on and turns off, it means the Power Board on the inside is bad. By opening up the monitor and taking one of the monitors with a bad video card to I get these working agian. They work for while, but expect the same issue to eventually start up again. Also by opening up the monitor be careful to set the LCD screen on something soft, otherwise your fix will end up just becoming another issue with white or black blotches on the screen. The two computer repair companies I have seen for fixing this monitor say that is normal, but they just don't know what they are doing. I am curently using one of the two I have fixed.

Another issue I am having is the Back light is shutting off itself. This I have not found a fix for as I have just opened this one up today. I will be digging deeper into this one as I need to find a way to remove this light and use the other light from the bad LCD screen. It kinda does the same issue, but the light at the bottom does not go on and off stating that the power board is not working properly. U are able to see the screen very faintly from very weird angles.

My last issue is the Video Boards seem to go bad as well. This has a few different problems and think its related to what goes wrong on the video board. I have seen things to just part of the screen not working, lines down the middle of the screen, and flickering issues.

The best fix for any of these issues has been trial and error. The other Q7 monitors that have started to fail I just pull out the guts of the monitor and place them in others till I get one to work. Once you find one that works you can just set up the other boards and LCD screens to find out which pieces are bad and unusable.

Hopefully this helps. thought I would post my issues along with ways I have gotten them fixed. I am still looking for actual blueprint designs of these Optiquest Q7 monitors to keep them in the best shape possible to get as many as I can fixed. I have a few LCD screens that are bad so eventually I will just be tearing into them.

Posted on Jan 07, 2009

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Mybe you but the brightness too low, try to turn the moniter on and press the botton next to the power botton on the right, and incres the brightness, do it fast, it will stay on

Posted on Dec 05, 2008

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