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Picture goes out of focus

My SONY KP_57XBR1OU rear projection TV goes out of focus.I hit on top of TV twice and the picture becomes clear until next time.How do I fix this.

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This is a classic example of a bad connection that sufficiently changes a circuit characteristic to cause a problem. If you can solder, you can fix this yourself. Look for any connections on the board that appear grainy or have rings and resolder them. That should resolve the problem. Note: there are potentially dangerous high voltages present inside the set even when unplugged. So be careful.

Dan

Posted on Feb 25, 2009

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