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I've done many replacements and all successful until now. iFixit have asked me to tweak the vcom setting +80 and -150 to see what happens. They seem willing to replace.
I just want to know what is going on really, for troubleshooting and certainty.
I pulled my big boy pants on and did 3 Kindle screen replacements today, a 7th gen, 8th gen and 11th gen. The 7 & 8 went perfectly. The 11 was a screen from a unit with a motherboard fault. That one also has done pretty much the same thing. Fine on refresh, fine on the lock screen, but when idle it gradually darkens. It feels like a massive coincidence that 3 panels from 3 completely different sources go this way in 2 days. They're all USB type C powered, newer devices but the actual panels are different, of course. 2 variants of Carta 1200, 1 Carta 1300.
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