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Thank you for all the advice. I did some poking around inside the monitor, but I can't seem to find the culprit.
I tried pushing down on the Flyback and the S-correction inductor with a plastic spudger, but nothing changed. The SMPS transformer is a bit out reach and I don't have anything long enough to comfortably poke it while the thing is on, but I've checked it while the power was off and it feels really solid.
One thing I forgot to mention is that it whines only when the input is a 15KHz one. I've tried with a Dreamcast outputting 480p and I don't hear anything (although it might be that it's just "singing" at a higher frequency and I can't hear it)
At the end of the day it's not a massive deal. It's annoying but it only lasts for 15-20 seconds if the monitor hasn't been on for a bit.
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