Sorry this is long. Trying this forum as a last ditch effort... Bought a 65" A90J in April 2022. Everything was great until this past August when one day the picture began to deteriorate about a half hour after turning it on. It very gradually got darker, lost contrast and color and generally got worse and worse. I had done the most recent update about a week earlier and suspected it may have something to do with that. Swapped out all the cables, switched power source, reset everything including a full factory reset (which doesn't reset the firmware). Eco everything off and auto dimming off. It was always great when first turned on but slowly over time degraded. After a few days of this it went away. Picture was great for a couple of weeks and I thought maybe it was something in the update that corrected itself even though another update hadn't come through (wishful thinking). Then it came back... few days bad, a week good... this happened a few times through August.
Called Sony and they went through everything and suggested I contact the local authorized service center. To jump ahead, it's out of warrantee (no I didn't buy the extended warrantee and have kicked myself enough already so save it), they're an hour away and I had to take it in which was an issue for me. So I contacted Best Buy and they sent their guy out. He did a hard reset and that seemed to fix the problem but a week later, it's back. Agreed to swap out the mainboard which he did a week or so later (in the meantime it cycled through good/bad). New mainboard seemed to fix the issue but nope. 4 or 5 days later it came back.
He said he'd try a new mainboard but in the meantime talked to his boss and Sony and the verdict was the panel was bad and there's nothing they can do. It again went through the cycle of 3 or 4 days good, problem comes back, etc. And that's where I am right now.
Any thoughts? I know panels can go bad but it seems odd that it goes through these cycles of good/bad. It's always fine when turned on and sometimes stays that way for days and then bad for a few day. No error codes just this cycle of good/bad.
If it's the panel and I'm screwed it stinks but so be it but I thought I'd give this forum a shot just in case. Thanks in advance.