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Electronics question

 
AlphaWolf
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User ID: 79736464
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12/09/2020 08:37 AM
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Electronics question
Does anyone know how to find out what a certain capacitor does on a motherboard?

Its a gigabyte x79 ud3 rev 1.1

The reason I ask is because I was removing an old cpu sink and one of the screws stripped so bad I had to use vice grip to get it out so I could put the new water cooler in.
Anyways, the vice bent over one of the caps near the cpu socket in the process and I thought I could gently bend it up up but it broke off..

Surprisingly the computer is rock stable and there appears to be full function of the computer and weird enough, one of the games I have been playing seems to run way smoother for some reason..

Anyways, I am simply curious what the cap I broke off did..
The location was north of the cpu there was a bank of 10 caps with the 10th one being away from the other 9 by half an inch. Thats the one that broke..

Last Edited by AlphaWolf on 12/09/2020 08:38 AM
deafcat
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12/09/2020 08:51 AM

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Re: Electronics question
the larger group of 9 is probably part of the northbridge voltage capacitation - which maintains the voltage to the ram and cpu for read/write

considering it posts and runs ok, that single offset one is probably for an option circuit in the bios, say for unlocking the voltage at the northbridge for overclocking the fsb or something similar
~343~
powerequalsisquaredr

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12/09/2020 09:03 AM

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Re: Electronics question
Any markings? Even a 3 digit one?

Usually very small caps have a tiny 3 digit # on them that denotes μF

If I had to guess this is a cap that regulates voltage swing. If you have a high quality power supply this would be a cumulative cap to cut high values.
powerequalsisquaredr
AlphaWolf  (OP)

User ID: 79736464
Canada
12/09/2020 09:08 AM
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Re: Electronics question
Any markings? Even a 3 digit one?

Usually very small caps have a tiny 3 digit # on them that denotes μF

If I had to guess this is a cap that regulates voltage swing. If you have a high quality power supply this would be a cumulative cap to cut high values.
 Quoting: powerequalsisquaredr

pic
[link to ibb.co (secure)]
powerequalsisquaredr

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12/09/2020 09:12 AM

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Re: Electronics question
https://imgur.com/a/9IczhVL

powerequalsisquaredr
DuckNCover

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12/09/2020 09:13 AM

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Re: Electronics question
Any markings? Even a 3 digit one?

Usually very small caps have a tiny 3 digit # on them that denotes μF

If I had to guess this is a cap that regulates voltage swing. If you have a high quality power supply this would be a cumulative cap to cut high values.
 Quoting: powerequalsisquaredr


So in effect a Voltage Ripple Filter???
Anonymous Coward
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12/09/2020 09:16 AM
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Re: Electronics question
Resolder it back. Capacitors are important. They can provide timing, voltage pull-up source for a line, power filtering etc. A cheap soldering iron is $10 plus $ for solder.
powerequalsisquaredr

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12/09/2020 09:17 AM

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Re: Electronics question
Any markings? Even a 3 digit one?

Usually very small caps have a tiny 3 digit # on them that denotes μF

If I had to guess this is a cap that regulates voltage swing. If you have a high quality power supply this would be a cumulative cap to cut high values.
 Quoting: powerequalsisquaredr


So in effect a Voltage Ripple Filter???
 Quoting: DuckNCover


I think it is a bit of a mystery and I like the overclock scenerio here most. Remember these components have a 20% over tolerance so the other inline caps will make up the differential by this lost unit. I would get a thermal gun and check the inline components after processing heavy graphics or a zero point calc.
powerequalsisquaredr
Anonymous Coward
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12/09/2020 09:19 AM
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Re: Electronics question
Take it to a repair place that does motherboard repair. Unless you have the knowledge and equipment to de-solder a solder in a new cap. And I don' t think you do...

Is it an electrolytic capacitor? Those havea gel layer inside, are "polarized" and can only go in one way(or else they'll "burst" their packaging). "ceramics" are fine either direction.
BBQ BOY™

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12/09/2020 09:21 AM

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Re: Electronics question
[link to www.personal-view.com (secure)]
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Have the Courage to be disliked.

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powerequalsisquaredr

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12/09/2020 09:21 AM

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Re: Electronics question
I def wouldnt go a try and replace it. If you are running, it isnt an active process and if it controlling a time function/overclock you will see heat in the surrounding caps.
powerequalsisquaredr
AlphaWolf  (OP)

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12/09/2020 09:22 AM
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Re: Electronics question
Resolder it back. Capacitors are important. They can provide timing, voltage pull-up source for a line, power filtering etc. A cheap soldering iron is $10 plus $ for solder.
 Quoting: Anonymous Coward 79629378


Getting a new ryzen 5000 system end of the month so it just needs to last till then. The board is 8 years old so its probably going to be scrap anyways.With my luck, Id probably short the whole board out trying to solder it back in.

Appreciate the replies guys, thanks.

Last Edited by AlphaWolf on 12/09/2020 09:24 AM
powerequalsisquaredr

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12/09/2020 09:25 AM

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Re: Electronics question
Resolder it back. Capacitors are important. They can provide timing, voltage pull-up source for a line, power filtering etc. A cheap soldering iron is $10 plus $ for solder.
 Quoting: Anonymous Coward 79629378


Getting a new ryzen 5000 system end of the month so it just needs to last till then. The board is 8 years old so its probably going to be scrap anyways.With my luck, Id probably short the whole board out trying to solder it back in.
 Quoting: AlphaWolf


Ryzen 5000 is the way to go. No overclock, maybe widen your memory swap files also in the mean time. I like your chances for 30 days. KNOCK WOOD!
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tkwasny

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12/09/2020 09:30 AM
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Re: Electronics question
Most caps are noise shunts to ground. Digital transitions generate voltage overshoot (noise) that "rings out". In CMOS, that noise can be enough voltage to cause the stage to turn on when it shouldn't or turn off when it shouldn't.





GLP