Sorry if someone have ask the same problem before,because I can’t find any thread about the same question yet.
I’ve mod many pads since now,but three of the pad have the same problem.
The RB,BACK,B is not working at all, all pcb is tested working before I disassemble it. And the PCB is old version, I’ve solder two resistors on the RT,RB points.
So any one have the same problem before,if so please advise how to fix it.