How to test Capacitors

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 There are three main ways to test capacitors.
1- Visual inspection:
This is the first thing must be done when you repair any laptop motherboard, we should check the electronic components to make sure that there are no traces of burning or roasting on any electronic component, first scan around the motherboard looking for capacitors which has its top will either swell or burst open.
                                the upper surface of the electrolytic capacitor is inflated

                                                 

 

In this case, you do not need to check the capacitors, just direct replace it and retest the motherboard.

2- Using Digital Capacitance Meter
  

 3- Using ESR Meter

This is the latest technology in testing capacitors. It is used to check on electrolytic capacitors and the advantage is that you can perform capacitor testing while the capacitor is still in circuit, it can test aluminum electrolytic capacitors, film capacitors, ceramic, high voltage capacitors, etc. It also has the function to check inductors and coils too.

4- Using Digital Multimeter
Using the Continuity test or the Buzzer mode

 

 

Testing SMD Ceramic Capacitor

1) Sound of a buzzer with 0 value so capacitor is damage (short circuit    

 

1) Put the two ends of the measurement
on the ceramic capacitor.
2) Shows value without sound of a buzzer
so ceramic capacitor is Good.


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