The V8-T851MGL has a known bug with Dolby Digital Plus over ARC. Go to Settings > Display & Sound > Audio > Digital Output and change it from "Auto" to "PCM" or "Pass-through" depending on your soundbar. If using external speakers, turning off "System Sounds" in the menu also helps.
If your TV is functioning but you want the latest fixes, use the built-in Over-the-Air (OTA) update tool: v8-t851mgl
After using TCL units running the V8-T851MGL for several years, here is an honest performance assessment. The V8-T851MGL has a known bug with Dolby
Users can check for and install this firmware update directly through their television’s interface: Open the or Setup menu using the TV remote. Navigate to the System Menu . Select System Update . Display & Sound >
Usability
Verdict