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Is it just a fuse?

I have a LG LCD tv. When I turn it on the pic does not come on at all or sound. I have to leave it on for about 1/2 hr. turn it off and turn it back on within seconds then it works. why??? Is it just a fuse? Once it's on the pic is great.
suzy, October 2010
link Click here to see other fixes for LG.