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Old 11-17-2019, 01:35 PM   #1
JonathanAnon
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Default SMD caps - any way of telling which is ground?

Hi guys,

This is pretty basic, but I've no schema for a particular board and I need to know which side of an SMD capacitor is ground. There are no ICs near by and there is a short to ground in some section of the board (so both sides of the caps are 0 ohms to ground).

Any ideas?
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Old 11-17-2019, 02:11 PM   #2
digitalpc
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Default Re: SMD caps - any way of telling which is ground?

i use power supply setup the voltage about 3volt 0.8amper in both side and see which side
drop more voltage is your ground, example one side of smd is 0.2v 0.8amper(this is your gorund) another side is 1.8v 0.8amper(this is your plus)

hope u understand what i mean

Last edited by digitalpc; 11-17-2019 at 02:13 PM..
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Old 11-17-2019, 02:46 PM   #3
JonathanAnon
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Default Re: SMD caps - any way of telling which is ground?

Quote:
Originally Posted by digitalpc View Post
i use power supply setup the voltage about 3volt 0.8amper in both side and see which side. drop more voltage is your ground, example one side of smd is 0.2v 0.8amper(this is your gorund) another side is 1.8v 0.8amper(this is your plus)

hope u understand what i mean
yeah I was going to just do that. I guess the level of voltage drop is dependent on the type of short also. if it's a complete short then I guess there will be no significant in the difference of the voltage drops on both sides of the cap.

I think I may just inject both sides at this stage and see what happens.
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Old 11-17-2019, 03:39 PM   #4
stj
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Default Re: SMD caps - any way of telling which is ground?

what type of cap, electrolytic, tantalum?
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Old 11-19-2019, 01:09 PM   #5
JonathanAnon
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Default Re: SMD caps - any way of telling which is ground?

SMDs, thought I was sorted when I had another board that was similar, but as it turns out it is different.

I'm just injecting 4 amps in to both sides and nothing is warming up. I scaled it up from 1 amp in 0.5 amp steps.
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Old 11-26-2019, 10:30 AM   #6
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Default Re: SMD caps - any way of telling which is ground?

Might get more reply if you upload good clear pictures of what you are dealing with.
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