How long has the LED flashlight battery been repaired?
When disassembling the lamp holder, you can insert the screwdriver or iron nail with a round head into the two holes on the aluminum ring at the bottom of the lamp holder. 3., then turn it gently. Note that the aluminum ring can be rotated easily if it is well maintained and has not been deformed by extrusion.
First, disassemble parts: the tail switch is difficult to disassemble, and basically eliminates the possibility of the problem; the lamp cap is completely disassembled (including bulb, circuit board, aluminum ring), battery pack.
Check the bottom circuit board of the LED lamp, clean dirty spots between all solder joints on the circuit board and check for short circuit. As shown, each of the two adjacent solder joints corresponds to the positive and negative poles of the LED light, and if the short circuit occurs, the entire LED light group will not be lit.
