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?

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? 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?

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! 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!