Troubleshooting of LED flashlight
The high-voltage step-down capacitor is damaged or the rectifier diode is damaged by overvoltage and can not be charged. At this point, the ordinary pointer type universal meter can be used to detect and solve the problem
Lead acid battery damage, can not charge and discharge, showing plug in order to use
LED dead light is not bright, replace LED can be, but note that + polarity can not be reversed
