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Monitor goes blank randomly

Viewsonic Optiquest Q91b 19'' LCD monitor goes blank. Power light goes off. I unplug 120VAC from monitor. I plug it back in and display is ok again. Sometimes I can get it back by just jiggling the plug at the monitor. I have tried a new 120VAC power cord and get the same negative results. The power cord plug is a female D connector.Will a defective internal power supply act this way or is it truly a connector mating problem?

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It is the capacitor on the power to the monitor. I have replaced about 5 so for. The capacitor is like 69 cents. Open it up and look at the circuit board where the power plugs into and see if any capacitor are bubbled up. If so then its a bad capacitor.

Posted on Jul 10, 2009

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My SunRay 2 keeps freezing
can someone help with one solution

Posted on Apr 07, 2011

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Try a diff monitor..if same thing happens then it is the system/if everything is fine then replace your monitor

Posted on Jan 19, 2009

  • mike anonymous Jun 04, 2009

    issue is with your monitor, if u can wiggle the wire and then sometimes it works and sometimes it does not then it will be a issue with the monitor - try a diff monitor to know for sure

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Viewsonic optiquest flat panel lcd monitor power light flashes on and off with a popping niose


Look for bad caps with bulging/leaking tops as shown here:
http://s807.photobucket.com/albums/yy352/budm/OPTIQUEST/Optiquest%20Q9B/

Very common problem in all LCD monitors as you can see in my albums.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Oct 26, 2011 | ViewSonic Optiquest Q9b 19" Flat Panel LCD...

1 Answer

How do I get the audio speakers to work?


Hello
xedman_0.jpg

-Make sure that you plug in the audio out from you computer to the audio port at the back part of you monitor -the audio controller of this monitor will be the function button in front.
the link below will contain the full manual of the monitor "http://www.viewsonic.com/products/archive/q9b.htm"
cheers.

Feb 24, 2011 | ViewSonic Optiquest Q9b 19" Flat Panel LCD...

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

1 Answer

Optiquest q9b-2 blank white screen (lights up when powered up) no video ??no problem with computer, video fine on another monitor, tried this monitor on several computers same problem, blank white...


Often problems with LCD monitors can be traced to bad capacitors. The following sites will help you identify if your monitor has bad capacitors, and how to replace them.

www.fixyourmonitor.com and http://www.youtube.com/watch?v=9Q6_TgNJvQw

Good Luck!

Feb 06, 2010 | ViewSonic Optiquest Q19wb LCD Monitor

1 Answer

LCD doesn't power up, light just blinks


Look at the power supply first; look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find

Nov 27, 2009 | ViewSonic Optiquest Q9b 19" Flat Panel LCD...

4 Answers

Viewsonic Optiquest Q19 blanks out - just a year old


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

Jul 18, 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

Monitor turns off and is dim


replace pwr inverter board...
replace the video/keyboard as well...

Feb 08, 2009 | ViewSonic Optiquest Q9b 19" Flat Panel LCD...

1 Answer

Blank screen with intermittent operation


you have bad capacitors in the power board inside the monitor replace these and the monitor will work fine

Dec 09, 2008 | ViewSonic Optiquest Q9b 19" Flat Panel LCD...

1 Answer

Monitor Blanking


Buy a new monitor... It will make your eyes stop watering.

Sep 16, 2006 | ViewSonic VP191b 19" LCD Monitor

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