Yesterday I replaced a keyboard in a laptop computer that had a case of the Zs. For some reason it shipped from the factory with two letter Zs. Then to add additional confusion the second Z, which was where the S should have been, was from a different font and in a different location on the key. A picture is below so you can see for yourself.
After receiving the replacement keyboard from the manufacturer it was simple to replace. Just remove the battery, the main bottom cover, and then a single screw holding in the keyboard. Install the new keyboard and then reverse the process.
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