Question about ViewSonic N4785p 47 in. LCD TV

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My Viewsonic 4785P is out of warranty. Problem is showing in different ways: image stays but sound goes then comes back, or not; everything shuts down and then comes back, or not; other times there is a very strident sound as if the set will explode. A tv tech suggested on the phone that the mother board could be either about to die or corrupted by my cable device and advised to shut down everything for 24 hours. Went very nicely then ... for 3 days and the same thing starts same way again What to do ? many thanks

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A problem like this can be caused by RF interference. Shut it all down again and move the converter, any cordless or cell phones, wireless PC's, routers, etc. so nothing is within 3 feet of your set. A poor ground on your converter can also cause RF interference. Make sure you have a grounded plug going to it, and it is connected to a grounded wall outlet....likewise for your set....and by no means have it near a microwave oven!

Posted on Apr 10, 2011

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Posted on Jan 02, 2017

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Hi.
Are you able to see a slight image on it at dusk and maybe with the help of a flashlight. since your blue light stays on the video board, may be okay.
It sounds like you have bad capacitors on your powerboard or possibly a burned out transistor on the inverter.

Only way to really tell is to open it up.
If you unplug the screen to video board ribbon, you may notice a different effect in the screen lighting.
There is a chance one of your bulbs is creating a problem
Should the screen happen to light up all white, then your power board and inverter are okay and the problem may be in the video board.
If it looks pinkish or dark or flickers then the bulbs or a bulb may be the issue.
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ebaysbammbammfran

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