When it's off is there a standby light? If not replace the power board. if there is there's a capacitor on the power board.
SOURCE: LG 60 IN FULL HD PLASMA
Try unplugging it from a surge protector if you have one and plug it directly into the wall see if thats a fix.
SOURCE: can't wire up to LG plasma HELP
Ah, I assume you have put rca's from the TV audio out to the Audio in of the Theatre System! Then put the Audio System to Aux 1 / 2 and you should have sound through your Theatre System!
SOURCE: l have a lg plasma 60 inch tv but the sreen its creaked
There is no other way than replacing the screen.
Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
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