Disassemble original power chip (usually 8pin) and switch check 300V capacitor check if there is short circuit ad board or high pressure board on the load port connect related circuit of module then install on original place of heatsink connect to power to check if there is output or need to check the pin; Yellow: DRAIN: power control port; black / pink cable: GND 300V connect to negative port of capacitor; Red cable: VCC module power supply port connect to positive port of rectified capacitor voltage is 12~18V; White cable: FB connect 4pin coupler; Green cable: start pin connect to positive of 300V capacitor