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Hi, Sorry to say this please replace keypad crstal IC,and jumper it will work 100% ....reheat the upper components and the the whole pcb,with care,the keypad ic is same as 6600, 6630, n70, 6680, 6280 LCD IC.
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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.