Got a nice replacement panel yesterday -- after an excrutiating 2+ hour process where the local repair tech spent most of it on the phone with Samsung engineers, live streaming my issue over his phone. Admittedly my yellow blotch was only visible on light backdrops, and didn't translate to phone capturing, but still I felt the TV was in warranty and it was worth rolling the dice to see what they would do.
I guess I should count myself lucky the tech was as old as my parents, because he kept hanging up on the Samsung guys over the phone -- the last time on purpose because it was clear they weren't going to accept the repair (even tho the new panel was on the repair truck and had been "approved" and ordered!). Eventually, the tech's boss was able to use the report the 2nd repair tech (who came here back in March) generated, and his boss called another Samsung guy in NJ who gave the thumbs up.
I would never buy another TV from these guys -- I mean, why is a cell phone the prevailing method of collecting evidence about a fault? I definitely had a burned out LED of some kind, and told them "it's only on WHITE COLORED BACKGROUNDS", yet the Samsung guy in NJ kept wanting the tech to roll through slides of green, purple, blue, etc. test patterns....where you'd never see it!
In fact at some point, the Samsung guy on the other end of the phone repeatedly said "there's nothing wrong with this TV, I cant see any problem at all!"
That said, and despite all this aggrevation, I still like this TV, and now that Game Mode patch has been implemented and I have a new panel, I'm good. Especially since OLED seems to have mounting issues of its own, this is a really good set for the present time...provided you have one that works, as we know!
Either way I will be sticking around longer
I did want to thank some of the fellow AVS'ers who helped me walk through the process. Had they not installed the new panel, I was prepared to continuously complain via phone and email -- which as the tech told me yesterday, was going to be the only way going forward to get anything done. Pathetic.