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Old 02-24-2004, 12:47 PM   #1 (permalink)
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Capacitor size

I have a gigabyte GA 7VTXE motherboard with some bad capacitors. how close to the original size do they have to be? is there any leeway?

It was a freebee junk board and I have some others for donor parts.

The bad caps are 4 x 3300uf 6.3v
and 2 x 1200uf 6.3v

there fairly easy to get to on the board so I figure its a good way to work on my soldering skills. If I can do it out of old parts even better.

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Old 02-24-2004, 12:51 PM   #2 (permalink)
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Is there any real problem with getting the same as the originals? I don't profess to know much about them, but I would think you would want identical hardware to what used to be on there. I know you can change things for stuff like voltage hacks, but better safe than sorry, no?
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Old 02-24-2004, 12:59 PM   #3 (permalink)
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just being cheap and seeking knowledge. its not like they will cost a fortune either though.
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Old 02-24-2004, 01:03 PM   #4 (permalink)
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Have you tried checking around Google for a modification guide for the motherboard?
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Old 02-24-2004, 01:24 PM   #5 (permalink)
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i would think that the farad rating would have to be pretty close. the voltage rating could probably be a little higher then the ones you're replacing.
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Old 02-24-2004, 01:25 PM   #6 (permalink)
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the voltage..in this case..isnt going to matter because I think 6.3 is the lowest thing available anyway....so you can get 6.3 or 10 or 15 or whatever...although ther eis no advantage do doing so.

as far as the capacitance...just dont go any lesser than the original.

You could always go more and be fine....as a matter of fact a larger capacitance would only give more stable voltage...more "headroom" etc

so if you find a 1500uf or 2200uf for cheaper than the 1200 then go for it.

But of course a higher capacitance is usually higher cost.



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The main time you want to be EXACT on a capacitor rating is when it is in some sort of timing type circuit...like a radio tuning thing etc....but for power supplies (and "smoothing" of motherboard voltages...they are more or less "brute force" deals that just smooth the 'ripples' off of the voltages....they store voltage so they 'cushion' the voltage....like a big water tower....the bigger the better....that way if 100 people turn on their yard sprinklers at one time the water pressure wont "sag"...same thing as electricity.

High dollar stereo power amps use HUGE capacitors....they hold so much power that they test them by unplugging the stereo and seeing how long it keeps playing, lol.
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Old 02-24-2004, 01:37 PM   #7 (permalink)
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that what I wanted to hear. so if I use 4700uf 6v instead of the 3300uf s I just have a bigger buffer. and I did see some 1500s.

this could work out well.
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Old 02-24-2004, 01:41 PM   #8 (permalink)
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exactly....I am sure the engineers work out a minimum size needed for the board and then they buy dictated on what they can get the cheapest....but nothing stops anyone from upping things a bit..especially overclockers...

I am surprised myself that all the tadoo about overclocking and I havent seen people offering to increase capacitance as a service etc.

No different than higher compression, bore job, hotter coil, or headers on a car....or even just a higher wattage battery for that matter.

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Old 02-24-2004, 03:43 PM   #9 (permalink)
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sweet
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Old 02-24-2004, 03:44 PM   #10 (permalink)
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i was tought that you can go higher in voltage not uf but i work on large motors and pumps not electronics so there might be different rules... uf is the "punch" that the cap gives but as far as voltage what goes in come out. take what i said with a grain of salt because like i said i work on large equiptment
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