China mobile keypad problem solution
China mobile Keypad problem have 3 type all key wor all key not work sometime work and some tiome not work if all key not work clean mobile board with ctc if still problem not solved now try format/flash your phone still problem not solved check ground wire connection with multimeter if break apply jumper for ground wire.Also you can check all key anyone is short 2 line if shord clean it with brush using pcb cleaner.if some key work and some key not work check keypad lines and also check keypad ground wire.if keypad sometime and sometime not work check keypad connection and re-soldering or keep there line join with extra wire.if all keys not work first check keypad ground and check all keypad lines if still problem not solved try these 2 solution 1st reheat ic if still problem not solve apply jumper as given below in image...
china mobile keypad jumper
china mobile keypad not working
china mobile keypad solution
china mobile keypad repair