After boot without any reflection, power indicator light, we measured the power supply 110V voltage is 0V, we disconnect the power line, access dummy load, power, light bulbs 110V normal luminescence measurements, the power is normal, measuring line pipe collector resistance to ground zero, indicating that the line output stage has serious short circuit to ground, we can check the line output components, check the line pipe properly, Zener diode normally, the last were measured each flyback capacitor, has been found to have a crack, measuring has been short-circuited, everything is normal after the replacement.
Fault Summary: When 110V is not normal, normal access dummy load 110V, measuring ground resistance line pipe collector has short-circuit fault is more, we should check the line pipe, zener diodes, and each flyback capacitor, S correction capacitors and so on.