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Replacement of capacitors?


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#1 computerfunguy

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Posted 03 September 2012 - 08:08 PM

I am working on a computer that i think needs new capacitors. Can they be replaced and if so what do they run? Thanks!

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#2 Romeo29

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Posted 03 September 2012 - 08:12 PM

Yes capacitors can be replaced. I don't understand the 2nd part of your question "what do they run?". Capacitors are used for various things in motherboards.
Just replace the capacitors with same voltage and capacity rating.

#3 rotor123

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Posted 03 September 2012 - 09:27 PM

I should mention that it isn't quite that simple, They have to be the same voltage, Microfarads (uf), Temperature rating, ESR rating and Ripple rating and Physical size. Then there are garbage brands and High Quality brands.

They can be used to filter the DC voltages. Usually there are some 16Volt ones that filter the voltage into the Voltage regulator Modules that control the CPU voltage. Then there are the 6.3Volt (4Volt too) ones (Often 8 or 9) that filter the output of the VRMs. Same Idea with the ones that filter the reduced voltages that feed the memory chips and so on.

Bad ones can make the computer Blue screen a lot or only start up sometimes. They are also in the Power supply and video card.

Roger

Edited by rotor123, 03 September 2012 - 09:28 PM.

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#4 computerfunguy

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Posted 03 September 2012 - 10:23 PM

i meant how much do they go for?

#5 rotor123

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Posted 03 September 2012 - 10:39 PM

How much is a new car? Same thing with capacitors, there is a wide range of prices.

First step is figuring what you have that is bad and then looking for a good brand that meets all 6 of the specs I listed.

ESR and Ripple are important and can only be looked up from what you have. Places that don't sell computer grade capacitors would include Radio Shack in the USA. They only sell General Purpose capacitors which are useless in computers.

Go to Badcaps.net forums and look around the recapping your motherboard forum as a start.

Roger

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#6 Romeo29

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Posted 04 September 2012 - 11:18 AM

Well rotor123 has given great information.

When I replaced capacitors in my motherboard, I just ordered Nichicon capacitors with same voltage and microfarad rating. I selected highest temperature range rating and they worked fine. Though only 2 capacitors were bulging, I replaced all the 16V and 6.3V capacitors.

I got 40 caps for around USD20.

Edited by Romeo29, 04 September 2012 - 11:27 AM.


#7 rotor123

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Posted 04 September 2012 - 11:50 AM

Changing all of a certain value and brand once one has gone bad is great advice, Since if they are all for example fuYeh 2200uf at 6.3 volt, once one goes bad the others are not far behind. What Romeo29 did changing all those was avoid future problems in the near future as others went bad.

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