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Replace C2455, a 47uf, 25V cap in the horizontal drive circuit. If you keep trying to power up the set with this bad cap still in there, you will eventually short the HOT. I had one of these sets come my way that had been in another shop for months. They told the owner that it needed a voltage regulator and that the part was NLA. The owner finally picked up his set and brought it to me for repair. After replacing the cap, the set worked fine.
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