first off if this tv uses the 17pw16 power supply, then it could well be the power supply that is faulty. there are 2 power supplies in 1. 1 being for standby and the other being for the mainboard, audio , idtv pcb and the inverter. it would also be worth while checking the inverter pcb for burnt components etc. as we have found that sometimes the power supply has failed due to the inverter failing....