Today, I got 2pcs power supply adapter from 2 different supplier
Out of curiosity, I unassemble them. Found they power supply module is quite different.
The one is bad , PCB is old , a lot of glue on the board, and there are lots of dust on the PCB, if the glue loose and two parts touch each other, it will cause fire
Below is the good one, PCB is new and clear, there is no glue
