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Hi, check for any speaker switches around rear of set that may have been accidentally switched. Could potentially have a "hotel lock mode"
which some philips sets automatically entered after a set time (namely months) which limited volume settings. Your friendly local service technician may be able to help you out with that one
check your power switch it appears that your contacts in side your switch are fused with arcs, and are not making good contacts.
change that switch with a new one. a switch has four contacts switches in it, use a volt meter to check the 115 or 240 AC through the switch.
before changing that switch you have to check for dry joints on your power suppy section of your tv.
We purchased a phillips plasma 50" in july 06 and it cut on and off 5 or more times a day I called phillips customer service they told us it was due to the cable company they came out and changed the tv jack gave us a new box and tested the lines said everything was ok. The problem still kept happening got back to phillips and they sent us a flash drive to update the info in the tv. still kept happening told us it was due to tv being sensitive to power flutuations. well we are now 5mths out of warrenty and the power board blows up! phillips will not do anything to help the person I spoke with admitted we were given bad advice the bill was estimated at over $500 so if I were you if its still under warrenty make them send someone out to look at it, Reading up on phillips tv complaints this seems to be a common thing By the way phillips customer service sucks dont rely on them to help you much. good luck