Question about ViewSonic VX900 19" LCD Monitor

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Viewsonic VX900 blank screen

My Viewsonic VX900 gave up the ghost the other day. The screen went completely blank. After reading this site for a while, I tried a few things and found that there is an image that I can see if I turn the room lights off and shine a flashlight on the screen. This leads me to suspect either a bad inverter or a bad CCFL/backlight. So the next thing I did was partially disassemble the beast. I found that there are 2 CCFLs mounted in a single reflector. The bulbs look okay to me (not that I would know what they'd look like if there weren't okay). The inverter also looks okay (same disclaimer).

Individual CCFL bulbs cost maybe $15 and I'd need 2, but to be honest, disassembling them from the reflector looks tricky and I don't really want to be messing with mercury vapor either. The assembly (2 bulbs in reflector) costs $70. New inverter also costs $70.

My question is, is there any way to try and figure out whether it's the backlight or the inverter? I don't have any sophisticated testing equipment like an oscilloscope but I do have a volt/ohmmeter. I'd like to only spend $70 once, not twice on a new inverter AND a new backlight if only one is broken.

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  • washboat Mar 04, 2008

    yes I have the same problem and another. fortunately, I used my ohm/volt meter. I found out that one fuse on the inverter was busted and the resistor connected to the 12v end supply to the main board with no continuity. My problem now is to find a schematic, the correct part # and a supply store.

    Can any one help me? thanks.

  • techmiller Mar 22, 2009

    i have a viewsonic vx900 and the screen is blank, with a signal going to the screen and push the power button the image will apear
    for a few seconds then disappear, it will do this over and over. is there a capacitor issue in keeping the bulbs energized. or are the bulbs gone.

  • Anonymous May 01, 2009

    Same problem, Fuse 1 is cooked. Anyone know what size to replace it with. I want to go to a local supply store and pick up a new one to attempt a solder job on it.

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Here is a pic of the fuses on the inverter board for a Viewsonic vx900, you can visually inspect them as well if you do not have a volt meter. While visual inspection is not 100% reliable, usually when these are popped you will see the red line across them is black or broken.
Viewsonic VX900 blank screen - 82dd678.jpg

Posted on Jan 03, 2009

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There are 2 fuses on the inverter board. your meter will be able to check which is the bad one, My guess is that is the one that does not have the capacitor next to it. the fuses are small suface mount style.

Posted on Feb 10, 2008

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Hey fuzzytek, can u take a picture of which fuses ur talking about? also is it always the fuses when the infamous vx900 turns on then off? could it be the capacitor?

Posted on Feb 15, 2008

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