When you have with the rs232 terminal output screen with only a code 73460012, than you may have voltage issue, thinking of a inactive 1.5v on the motherboard.
I think, check the voltages , one of them may have a issue and it may be inactive due a issue with the front panel, maybe the flat cable has some bad connection , or a issue with the front panel self.

Ps. Also replied on your post on jb8a8f8.
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Johnny B.

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