How to tell if the power supply is good or bad? How to test the quality of the computer power supply

How to simply judge the quality of a power supply.

Preparation tools: computer, power cord, wire. 1. Insert the computer power supply into the corresponding position of the power supply.

2. Connect the power supply and find the jack corresponding to the black and green wires of the jack cable on the power supply.

3. Connect the wires to the two jacks.

4. If the power fan turns up immediately, it proves that the fan is good, if it does not respond, it proves that it is broken.

Maintain your computer:1. Wipe the monitor clean with a lens test strip.

2. Use a balloon to clean up the dust between the keys of the keyboard.

3. The main engine power supply fan should be cleaned regularly with a cotton swab.

4. Use a balloon to remove the dust from the floppy drive.

5. If you want to disassemble the board, pay attention to whether the position is accurate, whether the slot is firmly inserted, whether the wiring is correct, etc.

To determine whether the power supply is working, you can check three places:

1. Whether the cooling fan on the back of the power supply does not rotate. Note: If the power supply is broken, its cooling fan will not rotate, but it may be that the fan itself is broken, so you should also check other places to determine whether the power supply is broken.

2. Whether the power indicator on the panel of the computer host is not lit. Note: The LED indicator on the computer host indicates the remote working status of the power supply, hard disk, and floppy disk, if these LED indicators are not lit, it is likely that the power supply is not powered.

3. Whether you can't hear the sound of the floppy drive, hard disk or optical drive working when you start up. Description: The computer checks these hardware devices when they are booted, and if they are not audible, the power supply is not supplied to them at all.

The power supply is good or bad, we can only use the instrument to measure, for example, like a multimeter, it is most accurate to measure with a multimeter.

Categories: Computer, Networking, >> Hardware.

Problem description: There is no shortage of power supply, but how to detect the quality of power supply?

Analysis: The simple solution is as follows:

Turn off the external power supply, remove the computer power supply, find a curved sail thick pin (fine copper wire, iron wire is OK), short circuit the power supply to the green and black (any black can be) plug in the plug connected to the motherboard, do not connect the wrong one, otherwise you will bear the consequences.

Find an outlet with a switch, connect the computer power supply with a power cord, and the total power supply at home is not tripped, and it is recommended to disconnect some household appliances first. Use the switch of the socket to turn on the power supply of the state town, if the power supply fan rotates, it means that the power supply is basically normal; If there is an abnormal noise, the power supply of the computer may be damaged, please disconnect the power immediately.

If the power supply is basically normal, when the power is on, adjust the multimeter to the DC 20V level and measure it according to the nominal voltage of the motherboard power socket on your motherboard manual. It is best to use a digital meter to observe the voltage size and fluctuation to judge the quality of the computer power supply.

In addition, you must pay attention to personal safety when operating.