Host switching power supply no output voltage, how to repair?

Failure if the power supply, the first test rectifier output,

If there is no three hundred (volts) check the insurance, the insurance has been broken don't be too busy to change

Rectifier bridge stack has a short-circuit, filtering capacitors or breakdown;

Degaussing circuit must be examined, the switching tubes or breakdown.

As long as you are careful to set the troubleshooting, the technology is not ordinary.

If three hundred (volts) have output, the first test protection control break

Protection circuit is not in action, the start-up circuit to check the first;

Feedback circuit also need to be checked, pulse width modulation look carefully.

Output voltage is high and low, the fault is set in the regulator area.

Trimming resistors should be replaced first, and error amplification must be checked.

The voltage regulator system will be carefully investigated, and the problem will be solved.

Note: The demagnetization circuit is a special circuit set up for the phenomenon tube in TV. It is not needed here, but the principle of the switching power supply circuit is the same.