How to fix keys on laptop keypad not working even keypad already replaced.

If you replaced the keyboard and the same exact keys are still not working then you most likely have a system board issue.
But check basic things and make sure before turning to any chip level operation that did you insert the cable properly and is your zip connector or header of keypad is good or broken from anywhere?
Some of my known people who connected with the laptop computer hardware

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Power up a laptop motherboard without power button or power strip.

Yes we can power up a laptop without connecting it's power button board or power strip..!! same as a desktop mother board.
It's safe as well as desktop motherboard just you need to know how power system of motherboard is functioning or how it's work as we press power button.Switching the power 'on & off' is done by circuits on the motherboard.The circuits are triggered to change state by a

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