Try measuring the voltage across the cap to see if you are getting the -21V bias. You should see this voltage at one of the connector pins as well. If you don't see it, that's your problem, and C22 is a likely culprit.

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Thanks tomlee59! Sorry for the late response.

Measuring the voltage across C22, I don't get -21V, In fact I seem to get almost nothing (-0.23V). I also don't see -21V on any of the LCD connector pins. I've already replaced C22, that's one of the first I replaced. Any hints on what's feeding C22? There are two opposing 220uF capacitors, C23 has about 12V and the one next to it is about 5V, those have been replaced as well. There are three 100uF ones near those that I haven't replaced yet. I'll check those out, I guess.