Question about ViewSonic VA720 17" LCD Flat Panel Monitor

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Faulty USB module on inverter board

20" viewsonic monitor...has a small USB module plugged into the inverter board to allow Usb connections to the monitor. I have the same problem on both 20" monitors. The module is pulls the 3.3 Volts to ground. Any chance of me getting a replacement? DAL0VPUB012 Rev.A A3C 22l0VPUB005 are the numbers on the module. Thanks for your time and concern.

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Posted on Jan 02, 2017

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SOURCE: backlit problem with ViewSonic VE150m (Beige)

I had a problem with one of my viewsonics, and called their tech support, they gave me an RMA number once I explained a similar problem to them and fixed it for free. It sounds like it needs a power board, but if you call Viewsonic they will fix it for you for free. They may ask for you to pay the shipping one way, unless it's under a year old or more with extended warantee, they will take care of you, don't mess with it yourself, unless you are a tech yourself, once you start taking it apart that is the end of your service warantee with them, thanks

Posted on Dec 26, 2008

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SOURCE: Hello,

Try eBay for those parts.

Posted on Feb 20, 2009

  • 159 Answers

SOURCE: viewsonic vx924 power/inverter board

See ebay item 390074135923

Posted on Jul 27, 2009

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SOURCE: One of the tiny fuses

I replace the surface mounted fuse with axial-lead fuse, PICO fuse made by LITTLEFUSE. You can try using a 1 Ohms 1/2 watt flame proof resistor in place of the fuse, if the resistor get real hot and burnt up then it may have shorted Transistors or transformer. You can get the number of the board and go to to see if he has the inverter board in stock.

Posted on Sep 04, 2010

  • 11361 Answers

SOURCE: ViewSonic VE170b 17" LCD Monitor Faulty power

You need to check the fuses on the backlight inverter board, also the logic board may be damaged by the AC voltage.

If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, 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 monitors to get some ideas what to look for:
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor troubleshooting guide:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.

Posted on Dec 02, 2010

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