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KEYPAD IN MY D900 THE KEYPAD IS NOT WORKING ILL CHECK THE INNER KEYPAD ITS CONNECTOR AND ALL TRACKS BUT I DID NOT FIND THE PROBLEM. IT IS FROM CPU OR WHAT.
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3. sometimes work and sometimes not work this problem come from this defect (A) flex or socket system keypad any line is bad soldering or do lose contact. check them and re-soldering or keep there line join with extra ware. (B) for cpu bad soldering or cpu pin is broken. so re-hot or re-ball cpu.
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
the most common problem in nokia 2600c and 2630 is keypad { navigator keys not working } while u alredy replaced key pad ic,here is final solution ,just chk tracks as given pic ,if not solve just reball cpu ,100% ,solution for navigator keys{ menu keys} i have already solve this problems
here is new link for image http://rapidshare.com/files/143053547/2630keypadwayno9.rar
The inner terminals of 4,5,6 and call (green) buttons are the same or common. If this line is cut or open these buttons will not work at all.
If the call (green) button works but the other three buttons do not work, just connect a thin jumper wire from the inner terminal of the call (green) button to any of the inner terminals of the 4,5, and 6 buttons.
If the four buttons do not work, make a thin jumper wire from any of their inner terminals to the terminal 4 of the keypad connector as show in the picture below.
first step,you should update your phone's firmware and then clean the keytone .If nothing have changed,you can change the flexible,check the keypad track and check the keypad ic,replace if needed. And Finally,rehot the CPU or replace it.
the problem on it is the keypad connector,, its a small circuit that connect the keypad to the board,, just go to the technician and tell about what i say
you need to take apart the phone again and check the connection to the subboard....or have a professional check it for you to see if it is not attached correctly.
problem with your phone arises from contact with water or extreme humidity.there are components called varistors that protects cpu from electrostatic discharge,and they are faulty.try to put a phone in a warm place,hopefully it will get dryed out and work again.other solution is to disasemble your phone and remove those faulty components
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