There are many kinds of keypad problem, Although we know that never happen damage on keypad. This is kinds of keypad problem with the solutions:
- When one of keypad pressed but Doesn't functioned, for example 3, Investigate and test voltage in button 3, if voltage is 0 V, It mean that there is no volt. Problem like this can caused by bad connection on the stripe, Try to cleaning the brass keypad in PCB using eraser that usually we use. If not success so we do jumper process by: if number 3 didn't functioned so jumper it with with number 2 (horizontal) and Number 6 (vertical), Jumper 'outside circle' between number 3 with number 2 (horizontal), Then jumper 'circle in' between number 3 with number 6 (vertical).
- All keypad doesn't functioned , So investigate and Test that Power's IC was good, heating it if IC Power was good, or Change IC Power with new. if IC Power was broken. Re-flashing it.
- when One of the keypad pressed, Our for example presses number 5 but output number 1. We investigate and test the voltage in button 5, So the result is 2.0 V. Problem like this can caused of unfavourable connection, try to jukper like manner above.
- When one of the button is pressed, so handphone was died, If we investigate or test so the result that taked outside is 2,8 V.
- The solution are investigate and testing the IC Power, Warming IC Power, if there was broken, Change it with new IC Power, Furthermore re-flash the software.
