This is a problem you won't be able to fix. LG knows about it. Give them a call. They sent a tech out who fixed my TV. They have to replace the whole mainboard. The tech said what happened was that they received the wrong capacitors from Mitsubishi, and they are shorting down, and once they are shorted, the TV has no filtering, and eventually dies... They have since changed the design of the mainboard, and is supposed to have a little better performance as well.