I recommend putting the PCB on a surface that's antistatic. Or use some clips.

In the 3rd image I have added a red rectangle around the fuse. It is right below the USB C port, to the left, on all models.

Use a multimeter to check for continuity. If the multimeter in diode mode makes noise when touching the 2 ends of the fuse, then the fuse is fine. Othewise, it is burnt and it needs fixing.

The fuse usually burns out due to weird behaviours with chargers that also do 6V for output. Some chargers have 5V, 6V, 9V and 12V outputs. It will not fail immediately, but overtime.