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Totally black screen with sound.

I have a QN82Q6FNAFXZA I purchased back in 2018 which has been wall-mounted. Last night while watching it the picture went black, but the sound continued. Since then I get the following streak of light when powering on, then the screen stays black.


When pressing the menu button I do not get the menu at all, but I can hear it scrolling.


Troubleshooting steps so far:

Unplug and re-plug: Same issue

Unplug overnight to let capacitor drain: Same issue

Checked external source: Same issue


I suspect a bad board, so would like to know if anyone has any ideas of which one specifically.