What is the model and age of your laptop?
I had some trackpad issues a month or so ago with my own Macbook, and it turned out that the battery was in need of replacement, swelling and pressing the trackpad. Also, have you tried clearing the NVRAM? Press the built-in keyboard keys P R option command while rebooting to clear the NVRAM. Also it might be worthwhile to clear the system caches … hold down the shift key while rebooting to do that. Then try re-pairing the bluetooth device and see if it is any more successful.
Troubleshooting is a process of elimination and often requires patience.
As a starting point, I'd try to reset both the macOS Bluetooth Device List and Bluetooth Controller.
IMPORTANT: This will reset all connected Bluetooth devices, including any wireless keyboard or mouse, so they will need to be reconnected.
Before commencing, you will need to have the Bluetooth icon showing in the menu bar. If it is not there, open System Preferences > Bluetooth and enable the option Show Bluetooth in Menu Bar.
Resetting the macOS Bluetooth Device List and Bluetooth Controller
Follow these steps:
- Hold down both the Shift and Option keys and at the same time and click on the Bluetooth icon in the menu bar. Once the menu is showing, release the keys.
- From the Bluetooth menu, choose Debug > Remove All Devices
- Hold down both the Shift and Option keys again and at the same time click on the Bluetooth icon in the menu bar.
- From the Bluetooth menu, choose Debug > Reset the Bluetooth Module
- Restart your Mac
- Setup your keyboard again
After doing the above, test your keyboard for a while to determine if it's now working better.
If it's not, there are other things we can try/test for on the MBP side of things. However, before doing that, the next step should be confirming the keyboard itself is okay. If possible, test the keyboard with another computer and confirm it's working okay with that. If it isn't, then replace your keyboard batteries of make sure they're fully charged and test again.
Let me know how you go up to this point and if necessary we'll proceed further.
Best Answer
Plug in any USB keyboard to the USB port.
Both work with any PC keyboard or Mac keyboard or whatever usb keyboard you might have around.
Hopefully the liquid damage didn’t break the USB controller or the system board. Your keyboard might be fine and the problem is no keyboard would work. If you reset your SMC once and external keyboard do not work, send your Mac in for data transfer or repair.
Here is a masterpiece on keyboards written by one of our resident experts.