Question about ViewSonic Optiquest Q19wb LCD Monitor

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Viewsonic Optiquest Q19 blanks out - just a year old

My Viewsonic Optiquest Q19 monitor blanks out although the light stays green. If I turn it off and on again, I can see for a few seconds (sometimes for longer) but then it blanks again.

I checked the device manager and it says monitor working fine yet each time I switch it on it shows images for about 20mins thereafter blanks out even thout showing power supply on.

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Yes your back lights are going out. but because they work for a while the backlights are probably good and you need to have the invertor looked ar.

Posted on Oct 11, 2009

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Sounds like the LCD panel inverter is going out, if not gone out completely.

Posted on Jul 24, 2009

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Sounds like the inverter / but you can check the caps on the power supply to see if you are loosing one / could cause the same problem

Posted on Feb 25, 2010

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You have to change your monitor... because it is damaged...

Posted on Jul 18, 2009

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1 Answer

Viewsonic Optiquest Q19wb lcd Monitor goes blank after 2 secs. A couple of posts say replace the 1000uf 16v Cap My problem is i can't find them on the pcb (where are they?)


Look at the board where the AC power connector comes in that is the power supply board, there are more than one versions so it nay not have the same caps value.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed Viewsonic/Optiquest monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague

http://www.badcaps.net

Post pictures or send them to me budmrtn@aol.com

May 15, 2010 | ViewSonic Optiquest Q19wb LCD Monitor

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Screen goes blank after 3/4 seconds Monitor approx.1 year old


I can confirm the number 3 solution. I have fixed a bunch of these now.
Replace capacitor C202, 680uf 25V. It is usually visibly damaged. It should be a low impedance type, often known as "suitable for switch mode power supply".Even yesterday.

Nov 06, 2009 | ViewSonic Optiquest Q19wb LCD Monitor

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Viewsonic Optiquest Q20wb green blink light


It's an issue with the power supply, most likely the Capacitors (one or more) may be shot. Open it up if it is out of warrenty, look at the capacitors (they look like cans), if they are bulging at the top or even sides they are bad. This is a common problem with this monitor. Crappy Caps used in manufacturing. Replace all the caps with same rated caps and you should be good. Do your research on how to desolder the old ones off and proper installation of the new ones.

Aug 18, 2009 | Computers & Internet

2 Answers

My Viewsonic Optiquest Q19 monitor blanks out although the light stays green. If I turn it off and on again, I can see for a few seconds (sometimes for longer) but then it blanks again


Sorry about your problems with the View Sonic 19” Monitor.
1st. thing you have to decide is weather the unit is worth repair and if you have the technical background to complete the repair.!!
If the power Led stay’s on and the video blanks out, it is most likely the backlight tube.
2nd. You can tell for sure, if you use a strong flashlight and see data on the screen.
If you can see data or images, it is the backlight. If the inverter board was bad, it would shut the power circuit down and you would not have continues power from the supply.
3rd. The backlight is not an easy job to undertake. Again, if you have little or NO technical background, you may want to pass on this project.
4th. If you decide to take on this project, you will need to order the backlight and if you are replacing that, you might as well check the Caps. And other components in the power supply and inverter board.
5ft. The backlight tube is cheep and can be purchased locally for under $10.00 USD
I needed to order a 15.1/4” tube for a laptop and decided saving 2 or 3 bucks was worth the investment. However, I ordered from China and had my tubes held up for over 5 working days and could have walked to the manf. And back by the time I had recvd. them.
Decide weather you want to repair it yourself, or have it serviced. A 19” View Sonic can be purchased for under $100.00 New with High Def.
The in shop repair with have to be more than the unit is worth.
Hope this information has been of some help.
If you decide to take on the job, drop me an email and I will go into better detail on what and how to do.
John Ray
john@johnrraycomputer.com

Readers, Please rate our information, it takes time to write this stuff and even if you disagree, that’s better than nothing at all.
Enjoy, and be safe.!.
Try it, it just may work…!!

Jun 29, 2009 | ViewSonic Optiquest Q19wb LCD Monitor

1 Answer

Screen goes black,power light stays green. display only stays on a couple of seconds


This happened to me and I was able to fix it. I cracked it opened and found a bad capacitor, bought a replacement at Radio Shack and I'm back in business. Actually using it right now to post this.
-Jon

May 27, 2009 | ViewSonic Optiquest Q19wb LCD Monitor

1 Answer

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Bad capcitor in the psu would cause this to squel and even pop so have it looked at you be glad you did.

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Not on


try eBay ressurectek for repairing you inverter/power supply board. If you have the one transformer (q9b-2) version, he says he can fix it.
tom

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