Replace the power supply instructions-3914P5
First, to disassemble the sign, see here.
Then, replace the power supply, please note:
1.There is two power supply in the sign, Each power supply is connected to three LED modules.
2.input terminal and output terminal is located on both sides of the power module, Don’t be reversed.
3.On output terminal, the red wire is +5v, the black wire is GND, Don’t be reversed.