Question about Sony KP-65WV700 65" Rear Projection HDTV

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Red my tv turns red after about 30 minutes My Sony T.V. kp-65wv700 after a 5min the screen turns red. If i shut the tv off and on the screen is good for a 3min. When the screen has a dark background (black/blue) the red is deeper and the picture fades.I beleive the tubes (red/blue) are bruned out or worn. Sometimes when changing channels the previous image stays on the screen for short time.

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Het Big AOT-

Sounds like the screen drivers for the blue and green projection CRTs sre possibly going south, or it could possibly be the CRTs(picture tubes) themselves going bad, although it would be highly unlikely for two tubes to go south at the same time. My money would be on the control circuits (screen drivers).

The easiest way to troubleshoot this problem would be to obtain a can of circuit cooler from an electronics supply house and determine the area on the motherboard where the screen drivers reside; then turn on the set and let it heat up until the problem occurs, and then carefully spray (one at a time) the components in the screen drivers area. When you hit the faulty component (probably a chip), the problem should clear --- until that part heats up to failure point again.

Determine the part #, obtain a replacement part, replace it and hopefuly the problem will be solved.

The last time I encountered a similar problem in the real world, it turned out to be a cracked circuit board, and all of the intermittently broken circuit lands had to be bridged by resoldering over the cracked area... a tedious and time consuming process.

If the set is still covered under warranty, let Sony fix it... any attempts by you could void the warranty!

Hope this helps and good luck! Keep us posted as to your results...

-WB

Posted on Jun 14, 2008

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