Keyboard types two letters instead of one letter
When you press on a keyboard key, it types two letters instead of one letter. For example, when you pressed on the letter “A” it types “AS”. It happens only with some keys. All remaining keys work properly. You reinstalled the operating system but it didn’t fix the problem.
1. Bad connection between the keyboard cable and motherboard.
2. Failed keyboard.
3. Failed keyboard controller on the motherboard.
Possible troubleshooting steps and repair solution:
When your keyboard starts typing two letters instead of one most likely you have a failed keyboard. Before you replace the keyboard with a new one, try reconnecting the
keyboard cable. It’s possible that contacts inside the connector got oxidized and the cable doesn’t make good connecting with the motherboard.
If reconnecting the cable doesn’t help, replace the keyboard with a new one.
If you still experiencing the same problem even after replacing the keyboard, most likely you have a problem with the keyboard controller on the motherboard. If that’s the case, you’ll have to replace the whole motherboard.