The CMOS battery is under the CPU fan and heatsink. You must remove the vented plastic cover on the bottom of the laptop. Then remove the CPU fan and heatsink assembly by loosening the four retainer screws and carefully unplugging the fan electrical connector. Then CMOS battery is under a cutout in the copper foil RF shield.
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Remove the keypad and check for fault in the pads. clean them well and checck the leads to the pads.
If there is not result or you see visible damage then it is possibble that a good service will result only by changing the keyboard.
Doing a sofft job will bring the fault back once again.
The CMOS battery is located on the motherboard, just under the bottom left side of the keyboard, by the letter 'V". It looks like a clock battery, marked 3V (volts). The battery comes out of its "cage/connector" by gently lifting it with a small flat screwdriver. Replacement CMOS batteries are inexpensive and readily available at any computer shop. Hope that helps