Micromax A27 - Keypad Malfunctions

15
3.8 Keypad fault
Check : DOME is pasted and
keymat is assembled correctly
Keypad doesn’t work
correctly
OK
Paste the DOME or
assemble keymat again
Yes
Is there any dirty on keypad
surface?
No
Yes
Clean keypad surface and
test
No
Replace new mainboard
No
Is sidekey soldered well?
No short circuit
Yes Solder or replace sidekey