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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.
Same problem, this is my solution. The system will start everytime if starting from power off one starts from sleep. Thus the trick is to use sleep mode to shut it down. I do not use the sleep function on the remote (it would be worth a try, let me know if you do that), but rather I have chose VGA as the entry signal ad have hooked the TV to my PC, and then I put the PC in sleep mode. The TV will do the same. When it is in sleep mode through the PC, the system cvomes back to life if the remote from the cable is used to change channels.
For a used part, or a complete used set like yours, try eBay. One thing to consider, is if someone is selling a used set there is a chance that its faults, or potential faults may be the same as the one that you have.
I have had the Dell W2600 for about 4 years. My remote for the Dell stopped working after 16 months. Since I was using cable I used the cable box remote. However, about 6 months ago a dark shadow appeared on some parts of the screen but the tv was still viewable. Shortly after, my power light would suddenly go out and then come back on after a minute or so. The problem got progressively worse until tonight it was off for most of the show I was watching and would come back on briefly. I popped the rear cover off and removed the metal shield and found most of the wires on one of the wire harness coming from the power supply board burned so badly the insulation was gone and the plastic connector assembly on the board melted. Because of the nature of modular board construction the power supply board and wire harness would need to be replaced and that doesn't necessarily mean the cause was fixed! To me this is a safety hazard. The TV is definitely out of warranty but I wouldn't expect this type of hazard problem. FYI, the parts I can read are made in China....what's new!