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Projection TV Problem

I have a 50-inch rear projection TV. When it is turned on, it works good for 10 or 15 minutes (sometimes for 25 minutes), then forms images with separated color. Any suggestions will be greatly appreciated.

(Many posts suggest convergence-circuit problem. If so, why does it work fine for several minutes when turned on, and then only go bad?)

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Thanks, Slinteriors. In replacing the ICs, I am concerned about the residual high-voltages. Are there any locations I should avoid coming into contact with? Are these easily identified?

Also, can I find step-by-step instructions on the IC replacement process? Thanks again.

Posted on Apr 03, 2008

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The convergence ICs are nearing the end of their operating lifespan. You will need to replace both ICs . Let me know if you need more information.

Posted on Mar 30, 2008

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HELP! 50 inch projection RCA HDTV. Turn it on sometimes minutes later, sometimes hours later the picture will go black with sound on once or twice and then it will power itself off entirely. None o


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In the convergence circuit, where the amps themselves are soldered to the foil side of the board, may be ring cracked. What you're doing by forcing it to start is causing an arc to form between the crack until the heat has built-up sufficiently to expand that joint and make contact. Eventually you will burn out the amps, overheat the return resistors and/or open some of the pico fuses in that circuit and send the repair bill that much higher... Better to pull that board, get out a good soldering tool and some solder and a good pair of reading glasses and locate / resolder those joints that are ring cracked...
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

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Sounds as though you have a filter capacitor bad in the power supply. I strongly suggest you have it checked and repaired soon, before it burns up a transistor or regulator. The cost may be a bit high now, but will escalate to possibly a complete power supply board. If you can repair your own set, check the main power supply filter capacitors. Good luck. I hope this has helped.
Ed
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Which sounds like a loose connection in the video or chroma section. you can carefully tap around affected area with a rubber screwdriver handle(not metal part) and see if it does come and go and look in that area for loose connections that needs soldering back. Hope this helps

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