On Dec 7, 10:46*am, Ancient_Hacker wrote:

They have custom brightness signals and lamp-out feedback signals that
have to be just right.
And the repair manuals are mostly useless as they don't give any
useful details.

Yep, and that's because the inverters are considered safety-critical
because of the high voltages. No Apple tech will try to 'repair' one,
just replace. Replacements aren't terribly expensive,
but only a certified program-subscribing Apple affiliate can
buy them from the Apple warehouse.

Either find an Apple-sanctioned repair shop, or ask Apple about
mail-in repair. If there's any chance the displays are under
warranty, asking Apple is a good idea, anyhow (they track
warranties by serial number, regardless of owner).