Many people find that the power supply, CPU, and other fans are no longer working when preparing to use a computer, and the computer is completely unresponsive. At this point, there may be a problem with the power supply or motherboard, so let's simply test the quality of the power supply ourselves. How to detect desktop power supply? Let's take a look at the desktop power detection method.

Desktop computer power supply

Accurate detection method/steps for whether the power supply of the computer host is damaged:

1. Press the power button and check if the power fan is rotating. If it cannot rotate, it can be removed for troubleshooting.

2. To accurately determine whether it is a power failure, after removing the power supply, you can use any conductor to connect the green wire to the black wire, and check if it rotates after connecting. Alternatively, use a multimeter to test the voltage between the green and black lines (at this point, the voltage should be around 5V). If the voltage value is too low or not present, the power supply fault can be directly determined.

3. If the above method is tried (the power fan can rotate and the voltage value is around 5V), then the power supply is normal, but to accurately determine whether it is really bad, first learn to read the nameplate on the power supply. We don't need to understand all the content on the nameplate, just understand the voltage of various colored wires. We can simply measure red+5V yellow+12V orange+3.3V white -5V blue -12V purple+5V according to the markings on the nameplate. Check if all the values marked above are correct.

4. Measure the red+5V, the difference between the measured value and the nameplate value is not significant, and the red line can be ruled out!

5. Measure yellow+12V, the difference between the measured value and the nameplate value is not significant, and the yellow line can be ruled out!

6. Measure orange+3.3V, the difference between the measured value and the nameplate value is not significant, the orange line can be ruled out!

7. Measure white -5V, the difference between the measured value and the nameplate value is not significant, and the white line can be ruled out!

8. Measure blue -12V, the difference between the measured value and the nameplate value is not significant, the blue line can be ruled out!

Purple+5V.

9. Measure purple+5V, the difference between the measured value and the nameplate value is not significant, so the purple line can be ruled out!

10. Until the measurement of various color lines is completed, if the measured value does not differ significantly from the nameplate value (within the range of plus or minus 1V). It can indicate that there is no fault with this power supply, otherwise it can be accurately determined as a power supply fault.

Attention: When using a multimeter for measurement, be sure to set it to the DC voltage range.

Damage to the power supply of the computer host can also cause problems such as screen flickering or system instability. If the computer encounters these problems during operation, it is necessary to conduct a comprehensive inspection of the power supply.