How to disassemble the circuit board of Newman's old machine

1. First, put Newman's old machine flat on the desktop, slide the back cover of the mobile phone by hand, and open the back cover to see the battery.

2. Secondly, take out the battery of the mobile phone and unscrew the screw with the corresponding screwdriver to see the circuit board.

3. Finally, protect the main chip of the circuit board with a shielding cover, which can be heated with an air gun and then melted with tin, so that the circuit board can be disassembled.