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Most of the failed microprocessors that I've run into were due to lightning damage. Some would cause weird symptoms just like you describe; but, most would short and load the B+ to the chip down. Just today, I was working on some POS Philco mid '90's color set made by some unknown company. The 5V to the micro was very low. I unsoldered the B+ input to the micro and the 5 volts came back up. I yanked the chassis for spare parts and pitched the rest.
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