A dead key, a letter that repeats on its own, a whole keyboard that stops reacting? Between a setting, a speck of dust and a genuine fault, the cause isn’t always the one you’d expect. Here’s how to diagnose it, and when to replace the keyboard.
A keyboard acting up isn’t always a hardware fault: a setting (language, Slow Keys), a speck of dust under a key, or a stuck macOS service can be enough. Check these free leads first. If a key stays dead, repeats or sticks regardless — often after a spill or from wear — the keyboard gets replaced. On MacBooks, it’s often part of the top case. A simple test quickly isolates the cause.
From setting to part: rule out the software and the dust before concluding it needs a replacement.
Characters that don’t match? The layout (AZERTY/QWERTY) may have changed. Keys that “don’t register”? The accessibility options (Slow Keys, Sticky Keys) may be active. Plugging in an external keyboard that works isolates the problem.
Test: a USB/Bluetooth keyboard that works points to the internal keyboard or a setting.A single key that sticks or no longer responds often comes from a bit of debris trapped underneath. A blast of dry air, with the Mac tilted, can free it. Don’t go at it with a screwdriver: you’ll quickly damage the mechanism.
If, despite settings and cleaning, a key stays dead, repeats on its own or stays pressed down, the mechanism is to blame. Depending on the model, you replace the key, the keyboard, or the top case that houses it.
MacBook 2016-2018? see our dedicated “butterfly keyboard” guide.When several keys fail at the same time, especially after a spill, that’s the signature of a liquid. The keyboard often needs replacing, and you have to check inside (the corrosion can spread further).
They save you buying a part for a simple setting:
Depending on the model and the extent of the problem:
Replacing a MacBook keyboard takes method:
“A key acting up means you have to replace the whole Mac.”
No: a key, a keyboard or, at worst, the top case can be replaced — without changing the machine. And very often it isn’t even hardware: a language setting, an accessibility option or a crumb is enough to create the illusion of a fault. Test the free options first.
Test an external keyboard, check language and accessibility, blow out the key: free. If a key stays dead, repeats or sticks — especially after a spill — the keyboard (or the top case) gets replaced, with a 2-year warranty.
Blow dry air under the key (Mac tilted) to dislodge a crumb, and check that no accessibility option is active. If the key stays dead, the mechanism is to blame and gets replaced.
A key that repeats often comes from debris or a worn or damaged mechanism (sometimes after a spill). Once cleaning brings no result, the key or the keyboard has to be replaced.
Not necessarily: it’s often the layout that changed (AZERTY/QWERTY) or an active accessibility option. Check the keyboard settings before considering a repair.
Yes, most of the time: the keyboard is replaced and the inside checked to rule out corrosion. Bring the Mac in quickly, without switching it back on or charging it if the spill is recent.
At Place du Mac, compatible keyboards range from about €11 to €140 depending on the model, tested and covered by a 2-year warranty. On some models, the keyboard is part of the top case.
Possibly: those models have a “butterfly” keyboard sensitive to dust, with its own solution. See our dedicated butterfly keyboard guide for this specific case.
Place du Mac guide — keyboards and top cases tested, 2-year warranty, repair workshop at 51 rue du Faubourg Poissonnière, Paris 9th. Apple, Mac and MacBook are trademarks of Apple Inc. ; Place du Mac is an independent repairer, not affiliated with Apple Inc.
