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To do a factory reset, you have to enter its service mode option. For more information go to http://electronicshelponline.blogspot.com/ Service mode entry, adjust & exit procedure to many popular brand TVs, including many models of Panasonic brand are given. Pull up older posts.
check for swolon capacitor in power supply or try to go in service mode and reset tv by pressing vol_ on tv and press recall button continious from remote tv will go to service mode then press vol_ on tv and ok from remote hold ok untill tv reset then unplug and turn on again.
Basically when it turn itself OFF automatically all the time, the TV goes into "Protection Mode". This happens when there is a damaged circuit board inside the need to be replace and turn itself OFF to protect the other ones from being damaged.
A TV service tech will have to look at it to find out which boards need to be replace. There are about 7 different boards in your TV that would cause this problem.
One of the circuit boards, possibly including the power supply has a critical failure. The power supply is in the protect mode. This type of set is serviced by board swapping, and then doing the necessary adjustments to match the new boards as required.
It would be best to call the factory authorized service for a quotation.
If the set is out of warranty you may find it fairly expensvie to service.
Enter Service Mode InstructionsWith TV on, press and hold the volume down button on the front of the TV, and press info three times on the remote.
Select Category Instructions1 and 2
Change Data Instructionsvolume up and down
Exit Service Mode Instructionspower down
Menu Categorywb adj
Menu Itemsrgb cut rgb drive all cut all drive -->do not use these unless you need to match ywo displays side by side.