Screen turns green or grey and then shuts down.

After about 10 seconds of being on the TV turns green or grey with some faint diagonal lines. When it is green it gets brighter and brighter then shuts down. I must unplug it to get the picture back, then it does this all over again. Seemed to have happened once and awhile then now its so bad can't use the TV. Could this be a capacitor of some sort, I cannot find any exact answers for this problem any help would be appreciated, seems others have experienced the same problem.

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