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.
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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
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Contact any service technician. Its CRT base connector socket, or, LOT is faulty. This is not a user repairable fault. Replacement to any one among component stated above, or both, might need replacement. Gopakumar Gopalan Google
When the picture is dark, show a torch light on the screen from a safe distance. If you can see the picture, the backlight is the problem. Anyhow, it is better to show it to a qualified service technician.
I had a similar problem with my Phillips 42 in. LCD HD TV.
Here's the problem. The Power Supply Board. I opened my TV
up(warranty was up of course) and found several bad capacitors.
Phillips and several other companies were sold capacitors that although
were highly rated failed within 5 years, some sooner, because of a lack of
preservatives. All sorts of electronic equipment is now being effected
due to these defective capacitors.
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.
Yes this thing start happening to my tv too about 4weeks ago and this goes away in about 15 minutes. TV is only 18 month old and I donot have extende warranty. Please post the solution if someone has got it repaired. Thanks
Sounds like your TV is not getting the right voltage. U need to get a power supply filter and then
all should be good. Not promising that it defo will, but everyone iknow who has this problem on a
widerange of makes and models have tryed this method and it has worked.
Let me know how you get on.