Just thought I'd post my repair success on this one since it was the newest OLED I've repaired to date. Symptom was TV acted like it was turning on but screen remained black and no audio. It was a bit sluggish to react to remote commands but hard to notice. Optical port on the main board lit up so that initially threw me off but the board was not putting out voltage to turn on the T-con so I proceeded with a main replacement. That resolved the issue. TV is less than 3 years old so pretty sad given the initial cost.
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