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My optiquest monitor flickers on and off all by itself. Any ideas

The on off switch is useless. I turn it on and it goes off, then comes back on, and off...... After shutting down the whole system and monitor, I can come back in a few minutes and see the monitoe has turned itself back on?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 17 Answers

SOURCE: Gateway Flat Screen FPD1830

My Samsung 215TW started flickering like a strobe light when I would turn it on... then after a while, the speed of the flashing would change, and eventually, it would go out. After turning the unit on/off several times, I could get it to stay on, but after a while, it would start to get odd video noise (strange colors appearing on the screen), and then it finally quit.

Once the monitor went dead, I noticed that I could still see the image on the screen, albeit very dark, so I took my desk lamp, and placed it next to the screen, and I could see that the monitor was still active, meaning that there was an actual image on the screen, it was just that the fluorescent lamp that lights the screen was not staying lit.

I got tired of waiting for Samsung's customer service (thats a story all within itself), so I took the monitor apart in search for the problem (I am an electrical engineer and electronics specialist). I saw that there were two circuit boards, one being the power supply board, and the other being the video signal board. Knowing that there was still a video signal present, I focused on the power supply board, as it contains the transformers to ramp the voltage up to the necessary voltage to light the lamps.

I instantly noticed that several of the radial electrolytic capacitors on the board were bulging and looked like they had swollen and then blown. There are 5 caps on my monitor that needed to be replaced: (1x) 47uF/50V, (2x) 820uF/25V, (2x) 330uF/25V.

The 47uF and 820uF caps are on the power supply side of the lamp power circuit, and the 330uF caps feed the control signal into the IC chips that control the ballast of the lamps themselves, one for the upper lamp, the other for the lower lamp.

Once I replaced these units, my monitor started functioning correctly, and I dont have to give Samsung my absolute most favorite monitor ever for a refurb unit that most likely will have 15 dead pixels on it (mine has ZERO).

Posted on Dec 08, 2008

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bigdogg85
  • 3 Answers

SOURCE: Soyo monitor goes dark every few minutes.

take it a part and look for swelled capacitors take out the bad ones and soder new ones in and then its back on

Posted on Jan 13, 2009

  • 2 Answers

SOURCE: optiquest q9 turns off

read the solution I have wrote on th Q7
display goes blank after few second
the fix is about 5 $ the supply is almost dead

Posted on Feb 01, 2009

  • 57 Answers

SOURCE: Monitor goes black after running for a few

Sounds like the computer is shutting it down and the monitor is fine. Check for viruses then check your settings in device manager for the screen saver and power down (screen off) options.

Posted on Aug 10, 2009

  • 208 Answers

SOURCE: Multisync LCD 1700V turns on then screen goes blank and shuts off

Does the power light stay on? If so, you have an inverter problem. If the power light goes off, you have a power supply problem.

Posted on Sep 02, 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

1 Answer

Turns off and then turns back on again on loop


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 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://www.badcaps.net
http://en.wikipedia.org/wiki/Capacitor_plague

Apr 29, 2010 | ViewSonic OptiQuest Monitor

1 Answer

My Monitor just stopped working. No pop, no fade, just dead. Oh, sorry it is an optiquest Q19wb says manufactured in 10/2006. bought 1.5 years ago at best buy. Worth trying to fix or dump it??


Optiquest is the Viewsonic low end products. You can take it apart and look inside.
Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, falied 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 monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.

Mar 30, 2010 | ViewSonic Optiquest Q19wb LCD Monitor

1 Answer

When I power on my viewsonic monitor it flickers and the screen doesn't come on. It is a 19" Optiquest model number VS11201 that I have had for 2 years.


After 2 years, more likely the caps will be bad by now, worst case will be bad lamps, open it up and look inside for caps with bulging top first, see example of failed monitors due to bad caps/lamps: http://s807.photobucket.com/home/budm/allalbums
Post back what you see so we can guide you further.

Feb 13, 2010 | ViewSonic OptiQuest Monitor

1 Answer

Optiquest q20wb goes to black screen after 2 secondsthen turn it off and back on stays on for about 2 seconds again goes black and if you leave it on the video will come back and then turn off almost right...


First to check will be the power supply, look for bad caps with bulging tops first then report back so we can guide you further, see example of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums

Feb 04, 2010 | Computers & Internet

1 Answer

Monitor flickers then goes to black/blank screen.


have you tested it for gone conponments

Aug 14, 2009 | Computers & Internet

1 Answer

Monitor flashes on then goes black.


I think you have the display shut off. the button on the bottom left will shut screen off. It will come on for a few seconds if you touch the screen, but will shut off again. just push the display button again and it should stay on.

Apr 02, 2009 | ViewSonic OptiQuest Monitor

1 Answer

Optiquest q9 turns off


read the solution I have wrote on th Q7
display goes blank after few second
the fix is about 5 $ the supply is almost dead

Jan 18, 2009 | ViewSonic OptiQuest Monitor

1 Answer

Display Problems - Static-like flickering with color problems and "sparkly" display


It didn't get moved closer to something else that could generate an electro-magnetic field, did it?

Feb 11, 2007 | Optiquest Q 71 17" CRT Monitor

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