Question about ViewSonic Optiquest Q9b 19" Flat Panel LCD Monitor

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Replacing the inverter?

I have an Optiquest q9b-2. Brought it home from work and it was working earlier I bring it home and no light comes on to show any power is reaching it, I have verified the power cord is good, hear a buzz coming from the upper right corner (with it upside down and cover removed and bottom towards me)

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The Optiquest Q9b has had a high failure rate due to bad capacitors on the power inverter board. Usually you can tell if the
capacitors are bad by looking at them to see if the top is bulging, if they are leaking, or if the bottom plug is pushed out. If you can use a soldering iron, you can replace the bad capacitors yourself. If you can't use a soldering iron, you can quickly learn enough to do the job by watching a few videos on You Tube. Here are a couple examples of videos on soldering and desoldering. Watch a few videos on both topics and you'll be good to go.

I found this extremely helpful tutorial on how to replace bad capacitors on the Q9b. It tells you how to disassemble the monitor, find the right circuit board to fix, and the tools and supplies you"ll need. However, the tutorial assumes, incorrectly, that there is just one version of the power inverter board. So don't just take for granted that you have to replace the same capacitors shown or that they'll be the same exact type the tutorial specifies.
The best thing to do is to read the numbers off any bad capacitors you find and buy new "radial-lead electrolytic capacitors" at Radio Shack ($1.49 each) with the same micro-Farad rating and the same or higher voltage rating (those are the two numbers you'll find on the capacitors). You can also buy capacitors online; just do a search.

Of course there are other things that can go wrong with a Q9b, but bad capacitors seem to be by far the most common problem.

I hope this helps.

Posted on May 17, 2009

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Do not order parts from viewsonic they are not good at getting out correct parts for their products. i am a tech and socialize with many that also have had dozens of problems.. watch out...

Posted on May 14, 2009

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If your inverter/power supply board has only one transformer, contact the resurrectek guy on eBay. He will repair your board for $24, per his advert. Mine has two transformers, and they are hard to come by. You can also search for the board number, and you will find the manufacturer has an office on Southern CA, with several supposed sites that sell their products.

Posted on Jan 04, 2009

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Look for bad caps with bulging/leaking tops as shown here:

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

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures:

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Capacitors kit: he can make you a set of caps for you.
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Probable source of the problem is the horizontal output (and high voltage) circuit although it can be killing the video earlier than that too. First step would be to dis- and reconnect the video cable to ensure it isn't a simple contact problem.
Second, using the brightness and contrast controls to see if anything is still visible. If you have a single horizontal line across the screen, then the problem is in the vertical deflection circuit instead.
If you have nothing, turn the monitor off, wait a few seconds and then back on. If you get a picture first then only a dot, its back to the horizontal circuit again. Try to note how it dies.
You may be able to somewhat diagnose the problem this way but that is a long way from a repair and with the cost of labor and possible unavailability of some parts, you should get an estimate before repairing it since it is possible that replacing it is cheaper. This is not really a DIY project unless you have technical background and a couple of test instruments.    

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

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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.

Sep 26, 2008 | ViewSonic Optiquest Q9b 19" Flat Panel LCD...

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