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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 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.
I picked up a wonderful three tier glass table stand for this exact T.V. at Wal-mart for $189.99, This is fairly inexpensive compared to some of the options out there, but its well worth the money. The thing that is great about this is that there is no holes to drill, no making sure its level. You just put the setup together yourself, attach the bracket to the back of your t.v. then hang it up on the stand and your good to got. It's very durable and you can swivel left to right. If your looking to spend less, there are a million different places on the web offering wall mounts for $29.99 on up.
It sounds like you have a power supply problem! You will
probably find some bad caps (capacitors) on the board. They will look
bulged on the top an may be a little leaky (brownish stain). In addition check the ribbon that feeds the lcd controller.
It's either the Y-main or logic board but you would need to do some extensive testing to know for certain which one... It's not the screen..
I would strongly recommend you take it into a shop and have a Tech test it and give you an estimate..
If you're NOT still under warrantee you should at least open the TV and check the board where the components are mounted and resoled any that look bad. If you are using a surge protector, try connecting the set directly to the wall outlet.
In your case it could caused by a blown fuse, a leaky diodes or a bad solder joint at the horizontal drive transformer.
All can be replaced at a local electronic or hardware store and they're easy to replace
If this does not correct the problem, you may need to have your TV serviced.