The failure of the black screen after the win7 system computer is turned on

1. Unpack the chassis and find that the power supply fan does not turn. The touch casing is hot. If it is suspected to be caused by a power failure, remove the power supply from the chassis for further inspection.

win7 Power off the black screen after the system computer is turned on

2. After removing the power supply, unscrew the four corner screws of the power supply surface, remove the outer casing, and unplug the fan cable from the power supply board;

3. Remove the sheath of the power output cable from the housing and remove the output cable from the housing.

4. Measure the fan with a multimeter, check that the fan is normal, and then check the fan power supply of the power supply board. Voltage, no output voltage after measurement;

5. Unscrew the four corner screws of the power supply board and remove the main board from the outer casing for further inspection.

6. Since the fan has no power supply voltage, it is determined that As the fan stops, the power supply temperature rises, the computer protects the black screen caused by the voltage protection, and the wind is found around the fan power supply unit, and one of the resistors is found to be soldered.

7. Fill the component with a soldering iron. Power-on test after welding, power fan recovery Rotation, the power supply board and fans installed in order, the power back onto the host computer, the computer boot after six hours of continuous operation and then black screen does not appear, since power-off due to a power failure caused by black failure excluded.