I took a ton of time taking the screen off since this was the first time I've opened up my iMac - the connections are fragile, but once you know where they are and how they connect, it's quite simple. I found that my inverter board and power supply had been corroded by moisture - a couple years right next to an AC unit were suspect, I guess. My screen is at full brightness and I've had no issue so far! Thanks, ifixit!
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