1, take apart your remote control, Look inside the circuit board, there is a black eight-pin or 18-pin black integrated block with 2262 2260 5026-1 5026-2 5026-3 5026-4 FP527 SMC918 PT2240 EV1527HT12D HT12E and other chips on it. 2, look inside the circuit board there is a silver square or round thing, what is written on it, such as :R315A, R330, R350, R390, R420, R433 and other words