Home Tutorials How to Test a PC Motherboard With a Multimeter?

How to Test a PC Motherboard With a Multimeter?

Last Updated on July 22, 2020 by admin

The motherboard of a PC provides the platform for the majority of the machine’s segments, allowing the use of complex hardware without requiring befuddling wiring schematics.

Testing or researching a PC motherboard should be possible at home, as a basic multimeter can be utilized to test different circuits and choose general electronic issues.

How to Test a Motherboard With a Multimeter?

How about we delve deeper into this and figure out how to use a multimeter while testing your motherboard.

For short circuits

We are going to talk about testing for short circuits first because it is a typical issue and may happen when there’s a flood of power.


  • Switch the PC off and unplug it.
  • Wait for several minutes so it chills totally and has no charge.
  • Draw out your multimeter and adjust it to the lowest setting. This is usually 200 Ohm. To carry the meter to zero, you have to touch both the leads together. When you do that, test it with the skeleton to guarantee that it is as yet zero.
  • Open your PC to discover the motherboard. Remove the ATX connector from it.
  • The red lead goes to the PSU’s AC ground pin while the black lead stays on the chassis. The black wire pins should be on the DC connector. Indeed, even at this point, all the readings ought to be zero.
  • Presently, guaranteeing that the black lead stays in its place, use the red lead to check all the hued wires. 50 or more is normal. Anything under 50 involves concern.
  • You can also check further to discover faults. Remove the motherboard totally from your system. Allude to the ATX 20-pin chart to discover the PINs on your motherboard. Use the red lead to test each of the GND pins. 3, 5, 7, 13, 15, 16, and 17 must be zero. If you see any other reading, there’s an issue.

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Testing the DC Voltages


Step 1

En sure the 20-pin ATX connector is in and the PC is trapped to AC power. Set the multimeter to 20V DC. Using the black multimeter test, test the backside of the connector, and set the black test in contact with pin 15, 16, or 17 (GND pins).

Step 2

Use the red test to test the accompanying pins (looking for the readings indicated in the parentheses): Pin 9 (Purple, VSB) ought to be at 5 V (any other reading indicates an issue with the PSU); and Pin 14 (Green, PS On) ought to be somewhere in the range of 3 and 5 volts. Press the PC power switch, and the PS_On value should drop to 0. Different readings indicate a faulty switch.

Step 3

Use the red test to check Pin 8 (gray, Power_OK), which ought to be above 2.5 V; this signals that it is okay for the PC to start. Pressing reset should make the Power_OK reading drop to 0 and then climb back up.

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Testing the PSU and Motherboard for Short/Open Circuits

Testing the PSU and Motherboard

Step 1

Unplug the PC from AC power and allow several minutes for any excess charge to drain. Set the multimeter to the most minimal Ohm setting (around 200) and contact the leads of the tests together to zero the meter. Touch the two leads to the bare metal of the PC’s chassis; the zero reading ought to be the same.

Step 2

Carefully remove the ATX connector from the motherboard. Keep the black test on the metal of the chassis and use the red lead to check the PSU’s A/C ground pin and the black wire pins on the D/C connector; these should all read zero.

Step 3

Keep the black lead on the chassis and use the red test to check the values of the shaded wire pins on the D/C connector. All shaded wires should give a reading of 50 or greater.

Step 4

Remove the CPU from the motherboard socket. Use the ATX 20-pin chart to allude to nail numbers to the board’s connector.

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How do you diagnose a bad motherboard?

Normal symptoms of motherboard issues are similar to CPU problems.

The system does not display anything; a mistake code appears; one or more blares happen, the system bolts, the system reboots, a Windows BSOD (blue screen of death) appears; or one or more of the ports, expansion openings, or memory modules fails.

Read more: How to update your PC’s BIOS?

How do I know whether my motherboard has no CPU?

You could think to press F2 or F12 some BIOS screen could appear, yet not without them.

Lack of RAM blares yet no screen. Lack of processor, nothing to process, blank screen. You possibly check if the power runs into your motherboard associating it to the alternate box from your pc tower.

What causes the motherboard to fail?

Motherboards can turn sour for many reasons, although there are a couple of normal guilty parties.

Among the most widely recognized causes of motherboard failure is excess electrical stuns, physical damage, or excess heat. A portion of these dangers are inescapable and may vary in probability relying upon your PC model.

Can you fix a dead motherboard?

Motherboards are way too complex for a human to fix. It would be possible, however, it would take forever.

Most motherboards these days are at least 8 layers of silicon with gold/metal traces follows inside them. Regardless of whether 1 trace is damaged, it might slaughter a motherboard.

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Can a power supply damage a motherboard?

Bad Power Supply Damage Motherboard

You should purchase the correct power supply for your PC. The PSU cannot give the necessary power required by the parts of the PC, motherboard and different segments fail to perform and in this way damage the motherboard.

However, generally, power floods do the main damage to the motherboard.

How can I test my power supply without a motherboard?

Although PSUs are intended to just work while associated with a motherboard, you can bypass this by utilizing a small length of wire.

Normally known as the paper cut test, this shortcut offers you the ability to check that the PSU is getting power without utilizing the motherboard.


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