I have this tv model p42h401, it would not power on one day no lights,sound, nothing. I ordered a power supply board and replaced it, and still has the same problem (still no lights, no sound totaly dead). I I have pushed the main power button along with the power button on the front of the TV.
IF you got a good board and a lot of replacement boards aren't good the only other thing that would make the set dead is if you have a bad main board, if your able to pull the back off and test the either 3.5 or 5 volt standby voltage if its ok then look at the PSON voltage, it should be at a half volt and go to about 3.5 when the power button is pushed..if you don't have standby you have a bad power board yet, if you have standby but no PSON the main board is bad, if you have PSON its back to the PS as being bad...Good luck!!
SOURCE: I have a hitachi plasma tv p42h401 it have no
NO POWER LIGHT, NOTHING. IS THERE A RESET FOR THIS HITACHI?
SOURCE: I have a Hitachi P50H401 plasma TV ,when you hit
unplug the unit for a while like one hour or so.
SOURCE: Model: Hitachi P50a402 plasma TV blinking
Did your already check your H- out section. This happen when your TV at protection mode. Its mean it detect defective parts inside the unit. Isolate the H- out power and open the TV Then check voltage if there's power reading meaning that the H- out section have problem.
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