You must be applying more than 3V to one of the inputs (assuming a 5V Vcc). Please see the LM339 family appnote, section 2: Application Design Guidelines for LM339, LM393, TL331 Family Comparators ...
The TCL C955 is being released as one of the successors to the popular C845, which competes with Samsung and Sony’s Mini LED models in terms of technology at a significantly lower price. It is, so to ...