Take apart the phone and remove the display assembly. We can see that the dot projector has been water damaged and the crystal on the dot projector is broken.

Pull the battery adhesive strips out. Take out the front camera assembly.

Connect the dot projector flex cable with the repair programmer. Click ‘Check’. Results: Fusing.

Judging by this, the dot projector flex cable has been damaged. We need to burn data of the original dot projector flex cable onto a new dot projector flex cable and then replace the broken crystal with a good one.