keypad problems and solutions

Keypad: Type of component that helps to operate a mobile phone. Some mobile phones are
screen touch and are operated by PDA.
 
Faults:

1. No Key Working or only Some Key Working.
2. Keys need more pressure to work. Or when pressed a key works continuously.
3. One key is pressed and some other key works OR when one key is pressed, some other key
works simultaneously.


Solution:

1. Check Facial of the Keypad.
2. Clean Keypad Tikli and Keypad Points.
3. Keep Multimeter in Buzzer Mode and Check Row and Column of the Keypad. If there is Beep
Sound then Pad is OK.
4. Keypad IC / Interface IC: Heat or Change.
5. CPU: Heat, Reball or Change.


Note:

1. In a Mobile Phone, when we press a Key and it works very slow then Reload Software to Solve
the Problem.
2. In all Nokia Mobile Phones, if only some key works or non of the keys are working then change
the Keypad IC to solve the Problem.
3. If Keypad problem is not solved by Hardware, then Reload Software in the Mobile Phone to
Solve the Problem.