How it works
Laptop keyboards differ in how they attach to the chassis. Some are replaceable assemblies; others form part of the upper case or require substantial dismantling. The replacement must match model, regional key layout, connector and relevant features such as backlighting. A physically similar keyboard can have a different cable or mounting arrangement. Replacing individual keycaps is a separate repair and depends on the underlying mechanism.
A non-working key can result from debris, a damaged switch, a loose ribbon connection or software settings. Testing an external keyboard and checking the chosen input language helps distinguish some causes, but does not prove the internal keyboard is healthy. After a liquid spill, replacing the keyboard alone may leave corrosion elsewhere. Repeatedly powering on a wet machine to test keys can make the wider problem worse.
Practical checks
Record which keys fail, whether the issue occurs before the operating system loads and whether a spill or impact preceded it. Consult the exact service manual before ordering parts. Back up data and follow the required power and battery isolation procedure for dismantling. After replacement, verify every key, layout, backlighting and neighbouring controls. Confirm cables are seated correctly and the upper case closes normally rather than relying only on the keyboard producing a few letters.