How to Check AC Adapter with Multimeter

If the laptop won’t power on when you using the AC adapter alone, maybe you have a faulty charger, you have to check it.

How to test AC adapter with multimeter:

To test the AC adapter, first you have to unplug the AC adapter cable from the Laptop.Measure the output voltage at the plug of the AC adapter cable. See the following figure:

test-ac-adapter

Note:

Output voltage for the AC Adapter in picture may differ from the one you are used. If the voltage is not correct, replace the AC adapter.

If the voltage is acceptable, check the power jack and the laptop motherboard. in most case the power jack fail or electronic component directly after power jack fail.

6 thoughts on “How to Check AC Adapter with Multimeter”

yoblo March 17, 2017 at 5:18 pm

nice info

Joko June 27, 2017 at 2:14 pm

I am using lenovo x230, my power adapter show 1 volt, what normal is it ?

helppard Post authorJune 28, 2017 at 8:39 am

its not normal

George November 27, 2017 at 6:55 pm

The voltage output is unique to each model of laptop, but is usually 9, 12, or 16 V DC. If you look for a plastic stamp or sticker on your converter, it is required to have the output voltage stamped on that. Hope this helps.