Question about ViewSonic Optiquest Q7b Flat panel TFT 17" Monitor

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Optiquest Q7B-3 Model Vs11147

The Lcd come on, stay on for 3-4 sec then gose blank I have same Problem did anyone try this. I was told to replace the flourescent starter.

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  • dansengine Jan 20, 2009

    I have the same problem except my goes blank after 1 hour after turning the monitor off and on it works for about 2-3 minutes and does the same thing.

  • j_scottn Mar 25, 2009

    I have the same Monitor and it does not power up at all. Should I try replacing the power supply?

  • Cedric Hamilton May 11, 2010

    In response to Solution 1. I replaced the capacitors on the Power supply. I actually replaced four of them with a slightly bigger capacitor and it still did the same thing. I believe one of the transformers or Transistors or something else is also messed up. I think it would be worth replacing the board.

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Actually that model has an integrated inverter with the power supply. Should be part # xlm1700390004 they cost around 25 bux and are fairly easy to replace.

If you are handy with soldering you could check the three 470 uf caps on the board they are tank caps and when they go they do what you are describing. Open the monitor and look at the three black capacitors if the top is bulged they are bad. If you have a capacitance meter check the capacitance it will most likly be well below 470 uf the caps are cheap like 39 cents if you do go this route use 30v not 25v caps to be on the safe side.

Word of warning switching power supplies can kill you quickly never work on it live and let it discharge at least an hour before working on it.

Posted on Jan 06, 2009

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Hi...there,
Well... not exactly, what you need is a new backlight inverter. The one you got it busted...

Posted on Dec 12, 2008

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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

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

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dantheman009,

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Good luck!
lotto-50

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