How to replace IO board of AC controller

1. Follow the video to disassemble the controller.
   How to disassemble the controller?

2. Remove 19 screws, and unplug 8 cables. Please mark the wire sequence properly. If the cable is plugged incorrectly, the IO board may be burned out.

3. Remove 6 cables.

4. Remove 2 cables.

5. Replace a new IO board.