How to Test Laptop Motherboard With Multimeter Step by Step Guide?

Here in this guide, I will explain anything about How to Test Laptop Motherboard With Multimeter. The motherboard is all boards’ mother! It is akin to the brain because it monitors all the functions of a CPU.

It is built so that it needs no wires for the circuitry to make sense. However, it a necessary to test or troubleshoot the motherboard from time to time. It is where a multimeter is useful. 

It helps you to test nearly all circuits, especially if something is amiss. Troubleshooting is a crucial element in owning a system or any electronic device; a multimeter is a fantastic tool.

Warning: Electricity work and electrical components may be potentially dangerous. For electrical measurements, extreme safety precautions must be taken. Read and understand the directions and warnings described in the owner’s manual before using a digital multimeter.

How to Test Laptop Motherboard With Multimeter?

Let’s look at this more closely and learn how to use a multimeter when testing your motherboard.

How to Test Laptop Motherboard With Multimeter

DC Voltages Testing

Step 1 

Set the 20V DC multimeter. Taste the back of the connector with the black multimeter sample and put the black sample in contact with pin 15, 16, or 17. (GND pins).

Stage 2 

Pin 9 (Purple, VSB) should be 5 V and pin 14 (Green, PS On) between 3 and 5V (any other reading indicates a fault in the PSU). 

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Press the power switch of the PC, and the value of PS On should fall to 0. Other tasks suggest that the switch is defective.

Step 3 

Use the red sensor to verify Pin 8 (grey, power) above 2.5 V; this indicates that it is all right to start a computer. The Power OK read should drop to 0 and then increase back up.

PSU and Motherboard Testing for Short/Open Circuits

Step 1

Unplug the AC power computer and allow any excess charge to drain for several minutes. 

Set the meter to the lowest ohm configuration (about 200) and touch the samples’ leads to zero per meter together. 

Touch both leads to the computer chassis bare metal; the zero reading should be the same.

Step 2 

Remove the ATX connector from the motherboard carefully. Keep the black sensor on the chassis metal and use the red conductor to inspect the PSU A/C ground pin and the black wire pins on the D/C connector; all should register zero.

Step 3

Keep the black lead and use the red sample to inspect the chassis of the D/C connector for the colored wire pin values. All colored wires should be 50 or higher.

Step 4

Remove the CPU from the socket of the motherboard. Use the ATX 20-pin chart to indicate the PINs on the connector of the board. 

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Maintain the black lead on the chassis and use the red lead on the motherboard to test the GND pins: pins 3, 5, 7, 13, 15, 16, and 17 should return a zero reading. Any other reading suggests that a connector may be defective.

How to test a computer CPU & Motherboard for failures?

The main activity is a visual inspection of the motherboard. Swelling or blown condensers are a typical source of motherboard problems or disappointment.

Check the top end of every condenser to see if it swells or spills, which is a sign that the condenser has blown.

You track swelling or blown condensers. It probably causes PC motherboard problems. A hard disc might give you hints of faults, such as blue screens or missing files. However, a motherboard will stop working unexpectedly.

  • For the CPU, a visual check is expected to remove the CPU from your PC.
  • When the CPU is removed.
  • Check for bowed pins as a background embedded in the motherboard.
  • You track a bowed pin, perhaps creating CPU and PC problems.

Can I Test a Motherboard Without a Processor?

As a result, we’d give an evasive response to this query. If your motherboard has particular functionality, you can test it without a CPU. POST (Power-on Self Test) is one of those features, and it uses LED lights to diagnose your motherboard. This capability is only available on motherboards of high quality, not on more than a decade old.

When you first turn on your PC, you’ll see that the cooling fans are spinning. It signifies that everything has been running smoothly to this point. Even if your PC continues to function after you install the CPU, you have no idea.

If your motherboard has built-in speakers, you’ll hear a beeping sound, which indicates that your motherboard is having trouble detecting your CPU. Your motherboard should now be fully functional, and you may proceed to install your processor.

But in the absence of critical components like RAM or CPU, certain motherboards will not beep. Don’t panic, however, as inbuilt speakers aren’t found on every motherboard.

How can I detect whether my CPU has been damaged?

  1. Add your PC to a plug and activate it.
  2. Search on your screen for BIOS maker names like Award, AMI, or Phoenix.
  3. When the PC fires up and then tune in.
  4. The file number and setting of beeps that occur when your PC passes an individual power test is also referred to as a POST test.
  5. The quantity and group of beeps showing CPU damage depend on your BIOS manufacturer. So go to the paperwork accompanying a PC or contacting a PC mechanical store to determine whether the POST is damaging to the CPU.
  6. Investigate the CPU fan to make sure it runs and replace the fan if necessary.

FAQs ― How to Test Laptops Motherboard With Multimeter

  1. How can I test my motherboard power?

    1) Connect the power supply to the wall.
    2) Find the large 24-hour pin connector connecting to the motherboard.
    3) Put the GREEN wire into the neighboring BLACK wire.
    4) The fan of the power supply should start. If it isn't, it's dead.
    5) If the fan starts up, it could be the dead motherboard.

  2. What causes a motherboard to fail?

    Excessive electrical shocks, physical damage, or extreme heat are among the most typical reasons for motherboard failures. Some of these hazards are unavoidable and can vary depending on the model of your computer.

  3. Is laptop motherboard repairable?

    It can be due to a defective motherboard if your laptop doesn't power on at all. But a motherboard may be repaired in many cases. In other circumstances, you can replace the motherboard without changing the other components, saving a lot of money.

  4. How do you diagnose a dead motherboard?

    The motherboard is the computer hence an entirely dead system is the traditional indication of a broken motherboard. If the motherboard is dead, fans, drives, and other peripherals can spin up, but more often than nothing occurs when the power comes on. No lights, no beeps, no fans, nothing.

  5. Can a bad CPU Kill a motherboard?

    A defective CPU could damage a motherboard. The answer is yes. It could blow several things if it were short to the ground.

  6. How long does a motherboard last?

    A standard PC motherboard can usually last between several months and decades. It will most commonly work for 10 – 20 years. Tip: To retain your motherboard longer, do not take action to kill your hardware.


It may appear overwhelming, but testing a multimeter motherboard is not all that bad. There are only a few steps to know How to Test Laptop Motherboard With Multimeter, and here we are! You will know whether there are any mistakes or whether your motherboard is immaculate.

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