Hi
Several keys of the keyboard are not working well. Some need to be clicked severall times with more pressure to work.
Can it be completely changed?
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That is likely dirty or worn carbon contacts. They might be cleanable, but that doesn't work for long.
Best just to replace it.
Just make sure you get an exact replacement. Search for this HP ProBook 450 G5 keyboard
The service manual is here.
A disassembly is here
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Well i will suggest you to use a external keyboard until you fix your laptop keyboard ans some time outdated driver can also cause this kind of issue as well so look for that as well.
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Yes, the keyboard can be completely replaced. If only a few keys are faulty, try cleaning under them using compressed air or a soft brush first. If the issue persists, replacing the keyboard is the best long-term solution.
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