Question about ViewSonic VX900 19" LCD Monitor

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Monitor isn't working

My viewsonic lcd flat screen monitor was really really dim, so i took it apart and i found that one of the fuses on the backlight inverter is blown. Would that make my whole monitor really dim? if i just replace the fuse would that fix it or should i replace the lamps themselves. I'm hesitant to do that cuz i don't want to get nasty chemicals all over the place

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Just replacing the fuse should help. There are two of them on the inverter board. depending on which one is blown will give you 2 different issues. One will cause the screen to flash content perfectly for two seconds and then drop out. the other will be really dark if can see any picture at all,

Posted on Feb 10, 2008

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I have VE710b monitor,i turn on monitor display dim.after 10 minute it coming good bright ness.


It seems to be the problem with the lamps inside the LCD screen. You have to replace one or both of them. You have to observe in what part of the screen is brighter, and how it changes in time.

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You may have backlight inverter failure, check the fuse as shown in my pictures, you can also have bad backlight assemblies also, but check the fuse on the inverter bd first, verify that you do have 12v at the fuse.
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX900/

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The flashing green power button is a well known electronic problem with this (and other) Viewsonic LCD monitors. There is YouTube video (do a search) showing how to disassemble the VX924 (very similar to the VX922) and find out whether the problem is related to blown capacitors. When I took my VX922 apart I discovered 6 bad capacitors out of a total of 7 on the power supply circuit board.

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1 Answer

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This is typical of a back-light problem, especially when you view the LCD screen at a sharp angle and you see a dim Windows image. This fault is caused by either a faulty inverter board or a faulty CCFL lamp.
The inverter supplies high voltage to the CCFL lamp. the CCFL lamp is a mini fluro lamp which fails with age and use.
This LCD screen can be repaired, the cost of an inverter board and CCFL lamp is a lot cheaper than a new LCD screen, but this is an opportunity/excuse to buy a larger size LCD screen as these monitors have dropped in price.
For service, parts and DIY info check out LCD Parts WEB site, please click on this link to their site :-
www.lcdparts.net

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Check the fuse on the inverter board and also verify it does have have 12vdc feeding the fuse. Worst case will be the lamps, power supply caps look OK?

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1 Answer

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You are not alone. I have a Viewsonic monitor that does exactly the same thing. Wasn't sure if it was the monitor or a "bug".

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replace pwr inverter board...
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See the existing topic 'monitor_barely_readable_dark_but_display'.

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