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from looking at a picture (i found) of the power board there could be a fault with the capacitors the three next to the heat shield. it is on the power out part. this area would be prom to get hot and weaken the capacitors. check them for rounding tops. replace for like to like.
I had a similar problem with my 42 in Philips LCD HDTV.
Here was the problem. My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired ofcourse) and found four bulged capacitors. Many electronics companies were sold capacitors that failed in 2-5 yearsinstead of 10-20. The capacitors failprematurely due to a lack of preservatives. Unfortunately, they were installed in allsorts of devices and cause a wide range of failure problems.
Here are some options for you.
1. Have it fixed by a professional $$$$$$$???????
2. Open your TV and find PSB. Checkfor faulty caps. If you find some (bulgedor leaking) bad caps replace the entire board. The entire board costs around $250 right nowbecause they are in high demand right now. They can be found at tv-part.com but supplies are limited.
3. Remove and then replace individual faulty caps. This takes some soldering skill.
Caps are inexpensive and if you can take care of it yourselfit will save you hundreds.
I have a tip/tutorialon this site that may also help. Itgives step by step instructions for replacing caps on PSB #715t2432-2. If this is your board you are in luck. It's called: Fixing the Philips Turns/shutsoff on its own problem. I'mworking on uploading pictures to help guide people though the process aswell. Let me know if I can do anythingto help.
Hope this helps and Good luck.
you are gonna have to take this apart,lay flat on table to remove the cover.first look at the power supply board,you are looking for swollen caps(round canaster-one side is marked - in black meaning negative.this tv came with 2 versions of power supply.part numbers 272217100569 phillips or DPS-279CP A delta.if you do not see any bad caps look for a bad fuse,replace if bad.if it blows the fuse again inverter boards,part numbers 6636L-0022A and6636-0021A.all of these parts are available at shopjimmy.com,just type in model number,scroll down to find any of these parts.