Re: Samsung 50" Plasma, No Picture or sound

i have the same problem with mine to same model ps50b450 turns on and melody sound 5 blinks on standby light stays ok on then nothing done the y main test and x main still the same changed main board changed power board but i did notice no flashing led light on the logic board i have posted help but not had a reply so i saw yours in a search on the net and hope to get help like you did