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there are 2 fuses -24v and 24 v normally would go out because covergence ics failled . That would be a shutting down problem cased by missing those voltages.so you would need to replace those 5A (small green fuses) , you would need some kind of soldering and unsolderin skill) and the ics are stk392 570.two also. open the set from the fron ,taking speaker grill off and then the wood board behing (4-6 screws) you the the board in the center big metal heatsink. you would need to work from the back to repace those puppies.hdtvman
Good Day, Nyung;
First try ro reset TV, unplug TV from the wall for 3 - 4 minutes then plug back into wall ac outlet; 2. This model is equipped with a keyboard lock feature. To unlock the keyboard press and hold the "menu" button on the front panel for 10 seconds.
I hope this was helpful, big IRISH.