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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jatadek Dec 31, 2007

Having the same problem. Had it serviced a year ago, and problem is returning again.
Anonymous Jan 21, 2009

having the same problem. on my kp46wt510.. help please..picture getting darker and darker....
help-09 Jan 21, 2009

same problem..

same problem..

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3,130 Answers

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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