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One source of information says that a board over on the right side of the TV might be bad, but that's a loose approximation.
The thing to do with one of these cases is, to not just buy boards, fit them in, and hope they work. You can go through a lot of boards that way, and burn through some money also.
I suggest that what you need for this case, is a good service manual originally put together by Panasonic, for your TV or its model line. The price may be Free, or about 10-20 $. But they are worth it, for various resources of information vital to repairing it efficiently.
If you would be interested in this, let me know, and I will do a search for a source of such a service manual.