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When you take the back off, there should be a circuit diagram. After seeing if there is a fuse and whether it is blown, look at all the boards and take some notes on the part numbers. The go to an old TV repair place and they can probably tell you if one of the boards is the likely culprit. The boards can be replaced. However, you may find that they are no longer available. And if available, it may be cost prohibitive.
Good luck
Yes, my dad did repair them when they had tubes in them.
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steve
old rocket inguneer
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