Step 1 : The box back cover doesn’t not has screw, just use any sharp thing, knife, in the edge of the box and pull the sharp thing , knife, a cover will be popped up and take out The circuit Board carefully.
Step 2 : Cut the power cable and peel the wire and 2 wire should be appear black and red as shown in picture
Step 3: Black wire will be connected to the first point on the right side and Red wire will be the first point on left side of the board. If in case doesn’t work the change the step to the opposite.If board lights on its mean wire should be solder with the board.
Step 4 : For the safety of wire melt the glue stick on wire with board to safe from moving
Yeah it,s Working