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It's working a little better, but I think I have a general idea for what the problem is -- when it's first switched on, the high-frequency whine appears, but quickly drops in pitch. Sometimes, it stays for long enough that a picture (specifically, static) will appear, but it then will switch to that weird scanning pattern with the drop in pitch. The frequency will also sometimes jump and twitch around, along with the picture snapping from wider to narrower, sometimes with a bright vertical line in the middle. Thus, I think the problem is related to the scanning circuitry. I'll look into that part of the board more closely if I can find a schematic.
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