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Old 09-04-2021, 06:41 PM   #1
bohaboha
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Default Help with smd capacitor test

i try to test an smd capacitor out of circuit but get no reading how to do?
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Old 09-04-2021, 06:43 PM   #2
petehall347
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Default Re: Help with smd capacitor test

i guess you found a bad one .. maybe try test a new one .
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Old 09-04-2021, 07:05 PM   #3
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Default Re: Help with smd capacitor test

i did it with 11 other but it is same is all of them bad?
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Old 09-04-2021, 08:53 PM   #4
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Default Re: Help with smd capacitor test

Quote:
Originally Posted by bohaboha View Post
i did it with 11 other but it is same is all of them bad?
maybe its your meter? try another meter?
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Old 09-05-2021, 07:14 AM   #5
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Default Re: Help with smd capacitor test

tested with what?
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Old 09-05-2021, 07:22 AM   #6
bohaboha
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Default Re: Help with smd capacitor test

Hi stj with multimeter in diode and ohms
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Old 09-05-2021, 08:27 AM   #7
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Default Re: Help with smd capacitor test

You really can not test capacitors correctly this way you at a minimum have capacitor checker at minimum but really need a ESR capacitor tester to do this correctly
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These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

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Old 09-05-2021, 08:39 AM   #8
bohaboha
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Default Re: Help with smd capacitor test

you mean that it is not possible with multimeter or digital tweeser am talking about microscopic smd capacitors the ones on the tv screen boards
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Old 09-05-2021, 09:01 AM   #9
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Default Re: Help with smd capacitor test

No capacitor can not be tested correctly just using diode test or ohmmeter

With just a ohm meter or diode test will only tell you if is shorted but nothing else really

Now if you have a capacitor tester that shows you UF value that is better than nothing however it does not tell you if the capacitor is good or not for this you need a ESR capacitor tester for this

This is the ESR capacitor tester that I use

https://www.ebay.com/itm/18423015559...QaAnBZEALw_wcB

Last edited by sam_sam_sam; 09-05-2021 at 09:09 AM..
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Old 09-05-2021, 09:33 AM   #10
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Default Re: Help with smd capacitor test

Thank you for the answer your tools is for proffs
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Old 09-05-2021, 09:39 AM   #11
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Default Re: Help with smd capacitor test

Quote:
Originally Posted by bohaboha View Post
Thank you for the answer your tools is for proffs
There other versions of this ESR that cost less however the quality with some of them is questionable
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Old 09-05-2021, 09:41 AM   #12
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Default Re: Help with smd capacitor test

our tools cost about the same as a couple of beers in sweden after taxes!
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Old 09-05-2021, 10:53 AM   #13
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Default Re: Help with smd capacitor test

You don't need to use that, the cheap "transistor tester" that has been discussed here and elsewhere works just fine and can be had for the same price as the cheapest beer you can find in Systembolaget.
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Old 09-05-2021, 12:22 PM   #14
bohaboha
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Default Re: Help with smd capacitor test

oh stj,sam_sam_sam and Per Hanson thank you i have that cheap an will test and se.
tack Per Hanson glömde bort den den ligger nånstans jag skall söka
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Old 09-05-2021, 12:26 PM   #15
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Default Re: Help with smd capacitor test

beer must have increased in price over the last few years - or the taxes increased!!
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Old 09-05-2021, 12:35 PM   #16
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Default Re: Help with smd capacitor test

Oops, the quick glance on eBay fooled me: the prices where for empty cases etc.
So make it 10 beers then
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Old 09-05-2021, 12:40 PM   #17
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Default Re: Help with smd capacitor test

beer are not that expensive as it was even taxes Per Hansson can tell
no not 10 beers Per just around 4 or 5
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Old 09-05-2021, 01:52 PM   #18
bohaboha
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Default Re: Help with smd capacitor test

ok i di some test and i get :28pF from both end of the capacitor and it does not show any esr so i can not know if it is good or not. the result is the same on all 12 capacitors
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