[Repair] What is the cause of the failure of the new multi-charger? [gma465]

Note: If you modify the video, you will not be able to receive the manufacturer's warranty.
If you purchased and used a new multicharger called GMA465
started to make noise
It seems that a warranty exchange can be done, but it seems that similar failures will occur even if the same thing comes again
I will try to find out the cause and fix it.
0:00 Broken brand new charger
0:56 What is the cause of the abnormal noise? (Disassembly)
2:52 Verification of abnormal noise
3:51 Newly purchased DC fan
5:25 Making wiring into pin connectors
6:34 noise comparison
9:09 Air volume comparison
10:08 Comparison result
10:30 Replace DC fan
12:02 After exchange