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Found a schematic online. This TV is COMPLEX compared to the sort of things I usually work on. Studied the schematic long enough to have an idea what the different parts of the TV do, and ended up being able to reproduce the problem by moving a card back and forth slightly. Used some contact cleaner to clean where the card connects to the main board, re-seated it, and the TV appears to be working fine. If the problem re-appears, I'll pull the board the card plugs into, and re-solder. Maybe it's not old enough to be special to anyone, but after my brief experience working on it, I sure have a better appreciation for the effort that went into engineering this TV.
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