Question about Sony KP-46WT510 46" Rear Projection HDTV

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Sony warms up - picture slowly becomes dark

Have had a Sony KP46WT510 for about 4 years. Now after it has been running for several minutes, the picture will progressively darken. Bright scenes and white background images continue to be well illuminated, but darker or muted images become almost black with very little brightness or contrast. When it is turned back on following a cool down period a normal picture is displayed and the cycle repeats. I've performed the standard resets, refocus and confirmed the picture and brightness settings. Any ideas? thanks! Scott

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Re: Sony warms up - picture slowly becomes dark

You are losing screen voltage or whats called the boast voltage most likely. This is probably being caused by a bad capacitor in the sweep power supply. You will need to get a service manual as well as use an ESR type capacitor meter to find the bad capacitor(s). Good Luck

Posted on Jun 05, 2007

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