How to Easily Detect a Failed Capacitor

Heat on top of cap producing sound if it work fine then its faulty

Please could somebody advise me I have a board with a 47uf 16v capacitor but it’s showing 197uf, I can’t find any video to explain a higher reading, is it a good one holding lots of charge or bad one? Please someone help as I have a problem with the board and this is the only thing I can find wrong

NoT currently right i built a buck converter and i use a 3300uf blue coler amplifier capacitor the current storge was very large and i get 21 amp easy from it but i use another 3300 capacitor nichicon caps it test good on my caps tester and i get zero amp storage from it so u dont know that there or 3 type of ekectrical caps filter caps that hold high current and smb caps that dont how enery just act as low pass filter for clearing frequency repple and high frequency caps for enery delay

Thank you very much!

Hello what's a 3n3 capacitor?

What about ceramic capacitors? I’m currently struggling to find the cause of low grid current in a vacuum oscillator induction furnace and it’s driving me nuts. All of the caps measure fine disconnected, chokes are fine, resistors fine, no shorts I can find. Only thing I can think of is capacitor failure under load (which I thought was extremely rare) or a bad signal transformer on the RF Furnace board.

my capacitors is 2200uf but it shows 4000+ uf.

At :40,..what the heck does "like this" mean?

Another way to check if the electrolytic cap is defective is by checking the pins under it. If it looks like rubber part at the base has cracked on it, it is already dried. If there some kind of white excess of internal chemical paste that leaked out from the pin terminal, again, it is also dried.

Most people only check ESR today, which can fool them with shorted caps. Leakage causes more problems than anything else but is seldom considered. I have rescued many items others had given up on because of this.

always show in comparison :)

Even easier, if it is a through hole type on a PCB it’s old and probably bad. Just replace it.

Sometimes it show a good value but high ESR

Electrolytics are the worst components ever! We really should invent an alternative to high capacity capacitors.

Nice video .Coud you make a video about"How understand "Capacitor's leaguge problem"?