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wash pcb with petrol and check again if doesnt work properly resold keypad ic with resolder paste because i hope pcb has some water or any liquid form under the keypad ic and remove keymat and clean keymat area on pcb if doesnt work yet resold upp carefully Note; cover up sim card connector and glued ic`s when you resold cpu
That button is part of the keymat assembly, so the only real option is to change the whole thing - it's easy to do, though - just remove the battery, memory card and SIM card, take out the 4 torx screws, remove the rear panel, unplug the display flex cable, then remove the main PCB and the keymat.
Dear check whether can you hear the keypad tones also you can not.then flexi cable is the faulty one .if u can purchase it i follow threw these steps to open the handset. Using screw driver unscrew 2 screws which is in the back side of front panel. after that remove the front panel remove lcd and menu keypad carefully move the flip to the top position inside u can find 4 screws and unscrew all those after that remove number keymat carefully. then u can find 2 screws and unscrew those. seperate the upper and lower pwbs carefully and take care while removing the flexi for its repective position fater placing new one follow the reci of above steps Better try it in a repair centre
remove back cover and battery
you can remove ur front panel by using ur nail it self
u can find white keymat that willbe fixed with flexi , remove it
then remove lcd carefully
unscrew the the four screws in the back panel
then seperate D cover from front panel you can find flex conn
give some little care while removing flexi cable for its position .
plz follow the reci for assembly