Question about ViewSonic VX800 18" Flat Panel LCD Monitor

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I turn my monitor on and I see the display breifly

I turn my monitor on and I see the display briefly and then it goes black. is this a backlight or inverter issue?

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Hi. it sounds like the power supply has gone bad... try to purchase a new power supply cord..

thank u
rate me

Posted on Jul 19, 2009

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That's right, the problem is related to inverter, but source of it - backlight lamps (if you see an image for fractions of seconds) or MOSFETs (if you see an image for few or more seconds). Image shows up, that means inverter starts, but then goes off because inverter controller turns into protection caused by something. Checking lamps is not that hard. Disconnect all cables coming from the screen and remove chassis with PCBs, so you will keep the display itself only. Next, at the edge where high-voltage wires are coming from, there you will see tiny philips screws, take them off. Then gently and very straight pull lamps assembly off the display, one and then another. If lamp is bad you shall observe contrast black ring or black dots near to the electrodes. Bad lamps must be replaced, you can buy them on ebay, for instance, just search CCFL 19". Or, if you don't care about total brightness, you can substitute faulty lamp with 27 pF 3kV capacitor, soldered across appropriate HV-connector on the inverter board - this will work also.

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There were two bad capacitors, the first and probably the main culprit was a 1000uF 25volt cap that had expanded and vented. I also found a 680uF 25volt cap that started to expand, and when tested it was low, about 550uF.

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Check for any capacitors that are expanded at the top. Look for a dome shape or feel with your finger, it should be completely flat. Or look for the rubber bottom pushing out where it goes into the board. This is the third monitor I have repaired in the last six months, and each one needed one or two capacitors to fix a dark back-light problem.

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Monitor displays breifly then goes to blank screen


If tried the monitor on two other computers with the same result -- definitly your monitor is faulty. Take it to the repair shop. To make double sure, run your computer with another monitor. If everything is fine now; you can blame the monitor.

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Monitor displays breifly then goes to blank screen


The power -inverter board probably needs an overhaul.
I redo many of these.
If the screen was pinkish or flickering before it finally got to this point, it is possible that a bulb has gone bad.
Fran

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Monitor displays breifly then goes to blank screen


There is just no way you will be happy to hear it needs service or replacement under warranty.

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Monitor displays breifly then goes to blank screen


F1 = Fuse 1
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Monitor displays breifly then goes to blank screen


I am not familiar with your particular model, but I do know what the problem is.
The inverter that runs the lights behind the screen is faulty and needs to be repaired. The lights shine from the top and bottom and reflect outwards through the panel so you can see what is on the screen. If you start the computer up, then shine a bright light into the panel you will see an image on the screen, but very feintly.
This can be cheap, it can also be expensive depending on where you go to get it repaired. Call aorund to a few TV shops in your area to get a rough idea on prices.

Hope that helps =)

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