Question about ViewSonic Pro VP2130b 21.3" LCD Monitor

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Had a look at a ViewSonic VP2130 with a friend of mine who used to fix TVs. He found a bad cap and has replaced it, however the LCD will still not function. We've looked at all the caps in the power supply and checked all the diodes. He has found the 12v and a 20v rails, and tells me that as far as he can tell the power supply is working. Unfortunately the screen still does not power on, the led on the front does nothing, and the screen remains dead. What else can I do, or what else can I have my electronics savvy friend look at before I condemn the screen to the spare part pile?

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  • paul_a_grove Feb 08, 2010

    Thanks for the responce carrrules, I've asked my mate about the J2 noise reduction, and he is not sure what part(s) you mean. Any chance you can elberate? I can probably take a picture of the power supply if you like?

  • paul_a_grove Feb 08, 2010

    Thanks for the responce carrrules, I've asked my mate about the J2 noise reduction, and he is not sure what part(s) you mean. Any chance you can elberate? I can probably take a picture of the power supply if you like?

  • paul_a_grove Feb 09, 2010

    Had another look at it today still not fixed but made some progress maybe, this time looked at the controller board as well as the power supply, tested most/all the caps, one was slightly popped and was working at only half capacity, and another 1000uf cap was rated at 1400+ !! anyway replaced both of those and put everything back together and now it works - but only sometimes. while it was working we did a power cycle and then it stopped working. took it apart, put it back together and it worked again, until the next power cycle.

    I looked for the J2 noise reduction and couldn't really find it, I found several Jumpers labled J3 onwards. possibly found a J2 under some white glue stuff. but even if i find it, what am I supposed to do to it, its only a strip of metal wire, theres nothing to replace... please help its so close to working!


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Its the J2 noise reduction. my **** did the same thing i changed it and now my **** works if u still have problem just post it here and ill go from there

Posted on Feb 08, 2010

  • carrrules
    carrrules Feb 09, 2010

    to put it simple it should be right before the power supply where you plug the cord into or the male end and from the J2 it leads to power supply . they will still push power to the power supply even if they r bad. but they dont filter out enough static therfore it trips a saftey switch in the power supply and keeps it from powering up the screen as a saftey feature


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Capacitors kit: he can make you a set of caps for you.
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Here was the problem. My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired of course) and found four bulged capacitors on the PSB. Many major electronics companies Philips/Magnavox, Sony, Panasonic, and others were sold capacitors that failed in 2-5 years instead of 10-20. The capacitors fail prematurely due to a lack of preservatives. Unfortunately, they were installed in all sorts of devices and cause a wide range of failure problems.

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Remember, TVs CONTAIN HIGH VOLTAGE AND CAN KILL YOU! Do this at your own risk.

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To disassemble your monitor follow these steps.
1. Remove the stand, usually 2 to 4 screws
2. Now there will be screws in each corner on the back of the monitor.
3. Take a small flat blade screw driver and seperate the two halves of the case. The front and back are held together by plastic latches spaced several inches apart around all four sides.
4. After the back case is off the boards you will be looking for are under the metal shield, remove the screws that hold it on.
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6. Be sure to replace any capacitors that have raised and blown tops.

I hope this helps, If so please rate my solution.
If you need more info let me know.

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