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the same thing happened to our 42 HP86 red smow at the top than one day now pcture just sound... we took ours to a television repair shop and said we needed a power source wich would cost about $200 and another $200 for the labour so we were looking at a total of $486 plus taxes..... we still dont know what to do when we bought the tv it was $2000 back in 2004.
needs a Y-Sustain board, about a 300 dollar part, unless you have a warinty, also try turning the tv on, after you get a green light, unplug the tv, after 15 seconds plug it back in, sometimes will make tv come back on
Hi, If you have confirmed that your power cable is connected properly from your TV to the wall outlet (bypass surge protector strip if you are using one), then no picture and no sound is typical of SMPS (Power Supply) board gone bad. It can cost upwards of $200 plus labor. The good thing is, LG generally offers two (2) years parts and labor warranty for their big screen TVs. LG Repair turn around time is usually fast. Goodluck!
Un plug the power to the Plasma Screen and also to the Media Receiver for ten minutes. Disconnect the off the air antennas both A and B. After ten minutes plug in the plasma screen then the media receiver and turn on wi the remote control. You should now be back in operation. I was.
Also It may not be a bad digital tuner. The TV Guide feature is active even when the zip code is set to all 0s so if you have an over the air antenna attached the TV will look for the TV Guide info and if it can not find it because of a weak signal or the chanel it is tuned to does not carry that information the TV thinks that tuner does not work which triggers the 12 flashes. Also on power up the gray box with the waring message "Plasma Display Starting Up, Please Wait" appears and the screen is blank.