TCL Service Menu Code:
Menu+Contrast+9735 or 1950
With the TV on, Select Home
Select Setting and OK
Select System and OK
Select About and OK, System info for TV will be displayed
Use the remote and press the following sequence: Up, Right, Down, Right, Up
Press the Fast Forward button 3 times
Press the Rewind button 2 times
Use the remote and press the back arrow (it’s located on the top left just below the power button), this should bring you into the factory menu.