The TV stops responding to the remote control or physical buttons due to a software mismatch.
As mentioned in troubleshooting videos, the P75-368V6.5 might need backlight voltage checks. p75-368v6.5 software
On the secondary tablet, Elias watched Train 77 plunge into a dark tunnel branch that hadn't seen service in forty years—a tunnel that led to a sealed dead-end. The TV stops responding to the remote control