Question about ViewSonic Optiquest Q9b 19" Flat Panel LCD Monitor

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Optiquest Q9 After about 14 months, my 19" LCD Optiquest Q9 monitor suddenly got very dark ( the bottom 1/4 was still viewable, though dark) and then went blank. After it cools for a while I can power it back up with the same results. There is a faint click when it goes black. I have replaced it with another 19" LCD ( different MFG.) which is working fine, but hate to throw this one away if it is repairable. The screen itself seems fine with no pixels missing at the time it went dark. There are four cards inside. A power card, a card on the horizontal axis, a card on the vertical axis and the main video card. I am not sure of the correct names for these cards. If I can get a replacemet card, which would it most likely be, or should I just trash bin this?

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  • madbob73 Jul 01, 2008

    Well Viewsonic was no help.

    I did do some reading here on similar problems and took a chance and replaced two capacitors on the inverter board. Now it works!

  • Anonymous Jul 25, 2008

    I had the same problem with my Optiquest Q9 (shortly after power-up the monitor would go dim) and tried to contact madbob73 to find out which capacitors that he replaced. Unfortunately, I did not get a response, but FORTUNATELY, after taking a look at the power supply circuitboard, there are only 5 caps. 3 X 470uF, 1 X 300uF and another very large cap. I had heard that some of the can type caps bulge when they go bad. All 4 of the smaller caps were bulged / rounded at the top. The large one was fine.



    To make a long story short, I was able to quickly get three 470uF caps at Radio Shack ($4), but was not able to purchase the 300uF cap anywhere locally. I decided to replace the 3 caps that I had and try the monitor. The monitor is now working fine! Thanks madbob73! You saved me a couple hundred bucks!

  • Jimmymcjim Dec 07, 2008

    My monitor went all dim and is flickering also. It is not a VX922, but a VS11201 (similar model). I will try checking the capacitors, and will replace any if bulging or leaking.

  • derrrick_mar Feb 08, 2009

    I have the same problem green power lights stays on but a black screen is shown and won't let me do anything. What can i try?

  • shep00 Apr 22, 2009

    All the posts made me feel brave and take my optiquest q7 apart and guess what I found..bloated capacitors! It is now at a bench tech to have the new ones put in. I am not brave enough to do the soldering cause I can't see tiny things like that.
    I will repost when I find out if it worked. What the heck, the monitor is already disfuctional and the MFG was NO help...it was only 3 yrs old. I will ck warrantys before I buy again........

  • Anonymous May 11, 2009

    I'm having the exact same problem. It started a few months ago with my monitor making crackling sounds and soon began to quickly flicker while warming up. I was hoping it would stop... unfortunately it only got worse. and after once night I began to smell I foul burning smell, immediately I shut it down for the night, ever since then the screen hasn't been the same lol. I'll check the capacitors tonight. hopefully this solves everything. I don't want to waste a few hundred dollars for a new one.

  • jonzie77 May 11, 2010

    Can anyone out there tell me what voltage the capacitors in question are? I was hoping to get them at work, preemptively, and install them tonight.

  • BillB Feb 21, 2013

    Is replacing the capacitors something a newbie can do ? Do the capcitors have to be "bled" . Not interested in getting shocked. Thanks

  • BillB Feb 21, 2013

    Is this something a newbie can do ? Do the capacitors need to be bled or anything like that ? I'm not interested in getting shocked. Thanks, wbrunc

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6 Answers

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I had this problem with my Q9 and I was glad to find the FixYa website with help. But I will offer more detailed info for novices to make sure you find the capacitors. First of all, it is not easy trying to find out how to open the monitor up! First, set it down flat on it's face, being careful not to scratch the screen. Pop off the cap that covers the stand mount to the screen. You might also want to remove the base by squeezing the bottom tabs to the middle and pushing them out. Once the base cover is removed, you will see the 6 screws holding the base arm to the screen. Remove those and the arm will come off. Now, on the bottom right, there is a beveled slot where you can fit a flat bladded screw driver to start to snap open the case. Move around the case separating it carefully until it is completely un-snapped. Unplug the speaker cable (mine gave me some trouble but I worked it side to side and it finally let go). You can push the videop cable through the the back case to get the case out of the way. Once you have removed the back half of the case you will not immediately see the offending capacitors. You will need to remove 4 phillips screws holding down a metal shield on the power board. You may also have to remove some metal tape covering 2 of the screws. When the screws and tape are removed, you will need to slide the metal shield to the right to release it from a 3 pin connector that the two boards. Be careful that you don't damage that connector. Lift up on it a little and slide it left until the connector is disconnected. Now you can see the capacitors. I only had to replace the 3 bulging ones and that fixed my problem as well. Thanks all for your helpful comments in saving me money on a new monitor!!

Posted on Oct 26, 2009

  • jackd7780 Jan 18, 2011

    Jayw135's posting (Solution 3) is VERY helpful in taking apart the monitor, identifying the bad capacitors, and fixing the problem!!

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Well... I took your advice and replaced the 3 capacitors that were "bloated" for my Opiquest Q9 monitor I bought off E-Bay and was very dim and making noises out the back... and so with spending about 4bucks at radio shack and then soldering the new capacitors on it now works perfectly!!! Saving me lots of money on buying a brand new one. This does work people!!!!

Posted on Aug 07, 2008

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My monitor, sure enough, had the dreaded 3 bloated capacitors. After soldering the new capacitors in, the monitor worked like new. Thank you Madbob for the suggestion.

Posted on Dec 09, 2008

  • CrouseZoo Oct 11, 2010

    Add me to the list. I had 4 bad capacitors to replace.

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I must agree with everyone, the first thing i always look for when something is wierd with my monitor (besides if it is plugged in) is the capasitors, its so simple just to visually look at them and check if any look different, i would say that it would be because of your capasitors too.

Posted on Jul 16, 2009

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Me too. Monitor was dim & squarkley-sounding during warmup. Then it went dark altogether. Replaced the 3 capacitors and it's working fine! Thanks.

Posted on May 10, 2009

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Same issue on Q9 monitor, powering off over and over again but no visible bloating of can caps. Are there other types of caps on power board?

Posted on Aug 07, 2008

  • billmorrell Jul 28, 2011

    If you are having noise problems / problems with display going out, go ahead and replace the caps even if they appear fine. The caps in my monitor showed no signs of bloating for any of them but I changed them out anyway and now the monitor works fine again.
    BTW, the existing capaitors are 25v 470uf and the ones I had gotten off ebay were 35v 470uf which are larger but it still seems to work fine.

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

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