Casio Electronic Keyboard CTK-481 Disassembly Cleaning and Assembly 

This video shows how to disassemble, clean, and assemble the Casio CTK-481 Electronic Keyboard. This step also applies and is similar to other casino keyboard units.
Tools and parts required:
-Philips screwdriver
-Brush for cleaning
-Pressurized air
Link for the Key not working repair process: • Scrap-n-Repair: Casio ...
Link for the Fading or dark display repair: • Casio Keyboard Fading ...
Disclaimer: Perform this repair at your own risk touching any internal parts can cause an electric shock