How To Check If Laptop Charger Is Working Without Multimeter. Now get your probes. You want to know in advance if a part is bad without replacing the part and there is no way to know that for sure.
Check on the bottom of your charger to make sure it uses standard polarity. Set your multimeter to measure direct current voltage on the 20-volt scale or anything close to it. This test makes sure your charger is supplying the correct DC direct current voltage to the laptop.
Plug the power cord back in.
Make sure you are not the checking the center pin 2 which is actually a pin that tells the laptop what is the power rating of the adapter. Across the test connections I put an approx 15 02 75 Ohms wire resistor scrapped from a heater element. The outer shell of the connector is ground but its not usually possible to get both multimeter probes into the port without touching each other. In order to Test a Capacitor using Analog Multimeter we are going to use its Ohmmeter functionality.
