Maybe so. Convergence is generally controlled by two large ic's " chips" from the symptoms you describe the convergence ic or stk's as they are commonly called are possible blown. When these short generally that will lead to a shutdown. There could be additional problems as always. Cost are difficult to deternine depending on where you get your repair. If the chips are the problem they generally average about 25 to 50 apeice for the chips. Our shop generally charged about 150 to 200 for such a repair. My advice is it is cost affective to repair this set. .Note: when these ic's blown they can damage other components that might add to cost of repair.
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