Power supply module ca-888 e-bike charger repair

CA-888 super LCD power supply pin jht -888 (e-bike charger repair ) #jht-888 Yellow Drain black gnd -340v to capacitor Red VCC 12v to 18v White F.B optocoupler greenb blue +340v to capacitor 1. Remove the original power supply chip on the board (usually 8 feet), and the switch (mos tube) 2. Check the 300v capacitor, as well as the capacitance of the load side of the package there is no drum, a problem on the first replacement 3. Check the load side there is no short circuit, ad board, high voltage board 4. Connect the module to the corresponding line, and carefully check that there is no wrong, if wrong can cause the module burst 5. Installed in the original location of the radiator, pay attention to insulation, not short-circuit 6. Power, measuring voltage is not the output, there is no output, then check the cause