I'm curious if there's a practical way to replace the offending electronics. I.e., retain the device's panel, panel driver, chasis, speakers/amplifier, IR rece

I'm curious if there's a practical way to replace the offending electronics. I.e., retain the device's panel, panel driver, chasis, speakers/amplifier, IR receiver, and perhaps power supply. But replace the computing hardware with something more open? I guess I have no idea how much custom firmware is needed to really get the most out of such devices. Especially for e.g. getting good color, and avoiding burn-in, on the display.