Of course, the QN90D is a much better TV than the TCL Q6. TCL offers 8-series TVs with similar picture quality to the QN90D for $4,000, which is still a lot of money, but much less than the $10,000 or ...
For more advanced troubleshooting, you can access the service menu on your Samsung TV: Turn off the TV and then press Mute, 1, 1, 8, and Power on the remote to access the service menu. Here, you can ...