How to Test a Motherboard With a Multimeter - Guide 2022

How to Test a Motherboard With a Multimeter

Here in this article, we will tell you how to test a motherboard with a multimeter. The motherboard is the essential component of a computer. They assemble all of the features of the computer to form a whole computer.

It serves as the conduit via which all of the computer's components interact. Your rig will not function correctly without a motherboard, and many people are interested in learning how to test the motherboard with a multimeter.

If your computer’s mainboard stops operating or does not function as it did in the past, you might experience various issues. Many issues might be caused by a malfunctioning or dead motherboard in your computer's hardware and software.

 A malfunctioning motherboard displays many systems, suggesting that it is likely to fail shortly. In case you're interested in the specifics of a failing motherboard or its symptoms, check out "Signs of a Failing Motherboard."

You must now determine whether or not your motherboard is malfunctioning. A multimeter may be used to do this at home.

Use a multimeter to check for minor faults with your motherboard's logic circuitry. If you have a multimeter, you will readily discover any electrical problems with your gaming motherboard.

DC Voltages are Being Tested:

A multimeter is required to examine the DC voltages. The multimeter may be either digital or analog. The stages for this operation are outlined here so that you may do it with ease.


First, we'll have a look at what to do. Check to verify that the 20-pin ATX connection is inserted and that the computer is connected to an electrical outlet.

Set the voltage of the multimeter to 20V DC. Probe the rear of the connection with the black multimeter probe, ensuring that the black investigation encounters pins 15, 16, or 17 of the connector (GND pins).

Step 2:

To find the readings specified in the parenthesis, use the red probe to probe the pins listed in the following table: Pin 9 (purple, VSB) should be at 5 volts (anything less indicates a problem with the PSU); and Pin 14 (green, PS On) should be between 3 and 5 volts (anything higher suggests a problem with the PSU). 

The PS On value should be reduced to zero by pressing the PC’s power button. Other readings suggest that the switch is malfunctioning.

Step 3:

Use the red probe to check Pin 8 (grey, Power OK), which should have a voltage greater than 2.5 V. This indicates that it is safe for the computer to boot. When you press the reset button, the Power OK reading should decrease to zero and rise back up.

Inspecting The Power Supply And The Motherboard For Short And Open Circuits

Step 1:

Unplug the computer from the mains power and wait several minutes for any remaining charge to drain the battery. Ensure that the multimeter is set to the lowest Ohm level possible (about 200) and that the probes' leads are touched together to zero the meter.

To check the zero readings, touch the two leads together to the bare metal of the computer's chassis. The readings should be identical.

Step 2:

The ATX connection should be carefully removed from the motherboard. Keep the black probe in contact with the metal of the chassis, and use the red lead to check the A/C ground pin on the power supply and the black wire pins on the D/C connection; all of these should show zero.

Step 3:

While keeping the black lead connected to the chassis, you may verify the values of the colored wire pins on the D/C connection with the red probe. All colored wires should have a resistance rating of 50 or higher on the meter.

Step 4:

Remove the CPU from its socket on the motherboard. When referring to the PINs on the board's connection, the ATX 20-pin chart should be used. The black lead should remain connected to the chassis, while the red information should be used to test the GND pins on the motherboard connection.

All three of the following pins should return zero: 3, 5, 7, 13, 15, 16, and 17. The presence of any other reading suggests the possibility of a defective connection.


Q1: What is the best way to determine whether or not my motherboard is defective?

If your laptop's battery is entirely dead, you should try plugging it in with your AC adapter and turning it on again. If that works, you may be confident that the motherboard is in good working order. However, if your computer is still having problems booting up or shutting down unexpectedly. You may get a beep signal. When the BIOS attempts to POST (Power On Self Test).

Q2: Is it possible to do a motherboard test?

The most straightforward approach to test a power supply is to connect it to a working system and turn it on. If the power supply fails to function, it is the power supply that has failed, not the motherboard. For those who are using a laptop, you may just connect to your AC adapter and turn it on. If this works, the motherboard is in good working order.

Q3:Do motherboards have built-in speakers?

Almost all motherboards have a small speaker, usually used to provide an audible beep when problems occur in the system. There will be audio connectivity included with your board, including sockets for microphones and speakers.

Q4: What is the best way to check a motherboard for short circuits?

To diagnose a short on a board, I've found that it's best to pass a tiny amount of current through the shorted traces and then monitor the voltage drop as the probe is moved along the lines using a sensitive voltage meter. The voltage decrease will become less noticeable as you get closer to the short side.

Q5: Is it possible to test a motherboard without RAM?

Turning it on will simply result in an error beep signal, which indicates an issue with the memory being absent. Additional information may be obtained if your motherboard is equipped with diagnostic LEDs or a port 80 LED indication. However, the monitor will not display anything.

Also Read: Can You Use Gift Card On Doordash?

Final Verdict:

We taught you how to use the multimeter to examine the motherboard's functionality. How will you know when to do this kind of inspection on the motherboard?

A malfunctioning motherboard exhibits symptoms the same way a sick person does. The signs imply that the motherboard or some other piece of hardware is malfunctioning. In this case, the multimeter will be used to determine if the motherboard is faulty or not.

If you have a defective motherboard on your hands, you must replace it since fixing it is not an option at this time. A malfunctioning motherboard has the potential to destroy the computer completely. As a result, it is preferable to have a single component replaced rather than the complete computer.

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