Step 1: Remove the screw shown in the picture.

Step 2: Remove the two screws shown on the back cover.

Step 3: Pry open the three clips shown in the image, then remove the cover.

Step 4: Hold the two white raised parts shown in the picture and pull outward to remove the two wire bundles.

Step 5: Remove the two screws shown, take out the old PCBA, and replace it with the new one.

Then, reassemble everything by reversing the steps above.

Note: When installing the new PCBA, if the two wires shown are hard to plug in, you can gently pull them out a bit to make it easier.

After connecting, open the bottom cover of the device and pull the wires as shown to tighten the wire bundle.