Keyboard Issue With Some Old Laptop Computers

Hi, I have serviced TVs, Stereos, VCRs, etc. for many years. I have worked on my own computers, but I have never been able to fix a keyboard on any of my old laptops.

The problem is a few keys do not respond (press them and nothing happens, but sometimes it does). Note: Nothing was spilled on the keyboard(s).

Note: An external keyboard always works.

What is the common cause for this type of keyboard problem?

Thank You in Advance, John

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Usually condensation dissolving the printed track. No real cure other than replacement.

Best Regards:
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Interboard header coming undone from flexing of case and then innards, not necessarily at the keyboard header

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