Abstract: when many people were preparing to use the computer, they found that power and fans such as cpu could not work and that the computer had no reaction at all. And then there's probably a problem with power or the main panel, so let's just run the good and bad tests. How do you detect the desktop power? Let's see how desktop power is tested。
How the desktop power detects the computer power detection method
Accurate detection methods/steps for computer mainframe power:
1. Press the switch button to see if the power fans turn. If you can't turn, you can take it down and run a check。
2. In order to determine precisely whether the power failure occurred, the green line may be connected to the black line by any conductor after the power has been removed and the connection may be made to see if it is rotated. Or test the voltage between the green line and the black line (at which point the voltage should be around 5v). If the voltage is too low or not available, power failure can be judged directly。
3. If the above method is tested (the power fan turns and the voltage value is around 5v), then the power is normal, but in order to determine whether it's true or not, first learn to read the label on the power source, which we do not need to understand in its entirety, simply to see what the voltage of the lines of all colours is. We can simply measure red +5v yellow +12v orange +3. 3v white -5v blue -12v purple +5v according to the sign. See if they all measure the correct values。
4. Conducting measurements of red + 5v. The measurements and signs are not very different, and can exclude red lines!
5. Measure yellow +12v. The measurement value is not much different from the mark value, and the yellow line is excluded!
6. Measure orange +3. 3v. The measurement value does not differ significantly from the mark value, excluding orange lines!
Seven, white-5v, not much difference between the measurements and the signage, except for the white line!
8. Measure blue-12v. The measurement value is not very different from the mark value, which excludes the blue line!
Purple+5v。
9. Measure purple +5v. The measurement value is not much different from the mark value, excluding purple lines!
10. Until all colour lines are measured, if the measurement is not significantly different from the mark value (in the range of positive and negative 1v). It can be said that the power was not malfunctioning, otherwise it could be judged to be failure。
Caution: to move to the direct current voltage slot when using a universal meter。
Computers the damage to the mainframe power source can also cause problems in the computer screen, such as dyslexia or system instability, which, in the case of computers operating, would make it necessary to conduct a full test of the power source。
