Replaceing Electrolytic capacitors

[[email protected]]

I am trying to replace some leaky capacitors from an Abit motherboard. Can I
substitute the electrolytics with some other kind of similar values? Thanks for
your help.

regards
hg.

 

[Baron]

I am trying to replace some leaky capacitors from an Abit motherboard.
Can I substitute the electrolytics with some other kind of similar
values? Thanks for your help.

regards
hg.

Farnell supply exact replacements. In any case you want low ESR ones
with 105C temp. Just watch out for the pin spacings.

 

[Eeyore]

I am trying to replace some leaky capacitors from an Abit motherboard. Can I
substitute the electrolytics with some other kind of similar values? Thanks for
your help.

It's important that you use 'low ESR' types designed for switching regulator use
(the ripple curremt will be specified at 100kHz). You may also find it tricky to
obtain some of the small can diameters, do check the physical size carefully.

You can find a lot of info about the 'bad caps' issue at badcaps.net

Graham

 

[Eeyore]

Farnell supply exact replacements. In any case you want low ESR ones
with 105C temp. Just watch out for the pin spacings.

They don't actually need to 105C types.

Graham

 

[Baron]

They don't actually need to be 105C types.

Graham

No I agree they don't. However from a commercial point of view
replacements should match the originals.

Your later comment on can sizes is very relevant though.

 

[Jamie]

I am trying to replace some leaky capacitors from an Abit motherboard. Can I
substitute the electrolytics with some other kind of similar values? Thanks for
your help.

regards
hg.

Yes, You can replace them with other brands as long as you use low ESR
types. Also, using the 105C types will last longer in a higher
temperature environment which in many cases is the cause of short lived
caps.
You most likely won't need low ESR cap's every where in the MB how
ever, they tend to be of a much better quality which over time pays
off with the price difference.

I think at some point, high ESR caps may just lose the market since
every one these days is looking towards low ESR in most applications
needed or not.

I remember once replacing some caps in a small PS unit that would not
fire up with low ESR types because the design assumed a small ripple at
initial start. it detected what it thought was a short and refuse to
start reliably. The fix was to place a 0.1 ohm r in series with one of
the caps that was in the sensing circuit.

 

[[email protected]]

Farnell supply exact replacements. In any case you want low ESR ones
with 105C temp. Just watch out for the pin spacings.

Thank you Baron. I took aquick look at the site and I seem to have missed some
of the criteia. I will check them out tomarrow at leisure. But I am miffed that
they dont list CANADA as on of the countries to choose

regards
harsha godavari

 

[[email protected]]

It's important that you use 'low ESR' types designed for switching regulator use
(the ripple curremt will be specified at 100kHz). You may also find it tricky to
obtain some of the small can diameters, do check the physical size carefully.

You can find a lot of info about the 'bad caps' issue at badcaps.net

Graham

Graham:
Thanks for reminding me about the size of the cans. Yes, I did check
the badcaps.net and when I tried to find some replacements, the local dealers asked
what is tantamount to buying a new board.I only wanted to do this as n experience. So
looked for vendors with a reasonable price. As it happens i have no experience in
things electronic... I am an old biologist..

regards
harsha godavari

 

[[email protected]]

Yes, You can replace them with other brands as long as you use low ESR
types. Also, using the 105C types will last longer in a higher
temperature environment which in many cases is the cause of short lived
caps.
You most likely won't need low ESR cap's every where in the MB how
ever, they tend to be of a much better quality which over time pays
off with the price difference.

I think at some point, high ESR caps may just lose the market since
every one these days is looking towards low ESR in most applications
needed or not.

I remember once replacing some caps in a small PS unit that would not
fire up with low ESR types because the design assumed a small ripple at
initial start. it detected what it thought was a short and refuse to
start reliably. The fix was to place a 0.1 ohm r in series with one of
the caps that was in the sensing circuit.

Jamie(and who is never wrong):
Thanks for the info re high/low ESR
caps. The caps on my motherboard were "Capcon" made in Taiwan.

What I would like to know is can I replace electrolytic capacitors with solid state
(like tanatalum) capacitors that do not either dry up or leak.Is it a reasonabl
alternative costwise? Mind you this MoBo is outdated and I want to repair it to prove
to myself that I can do it

regards
harsha godavari

 

[Roger Hamlett]

Jamie(and who is never wrong):
Thanks for the info re high/low ESR
caps. The caps on my motherboard were "Capcon" made in Taiwan.

What I would like to know is can I replace electrolytic capacitors with solid state
(like tanatalum) capacitors that do not either dry up or leak.Is it a reasonabl
alternative costwise? Mind you this MoBo is outdated and I want to repair it to prove
to myself that I can do it

Tantalum capacitors, are _not_ inherently 'better' than good
electrolytic capacitors. In some workplaces, they are actually banned
on safety grounds!. Substituting tantalum, in a circuit as tightly
designed as a typical switcher used on a motherboard, could easily
lead to failure, as the behaviour is so different, with the different
frequqency responseand inductance in particular leading to problems.
Look at good low ESR electrolytics. One classic type, is the Sanyo
OSCON range, but I don't know if they offer these in the size you
want.

Best Wishes

 

[Michael A. Terrell]

Graham:
Thanks for reminding me about the size of the cans. Yes, I did check
the badcaps.net and when I tried to find some replacements, the local dealers asked
what is tantamount to buying a new board.I only wanted to do this as n experience. So
looked for vendors with a reasonable price. As it happens i have no experience in
things electronic... I am an old biologist..

Someone sells small quantities of 105 degree low ESR electrolytics on
Ebay.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Eeyore]

Someone sells small quantities of 105 degree low ESR electrolytics on
Ebay.

Yup. Ebay is remarkably useful. I find you can often get otherwise tricky to obtain parts
on there.

Graham

 

[Eeyore]

What I would like to know is can I replace electrolytic capacitors with solid state
(like tanatalum) capacitors that do not either dry up or leak.Is it a reasonabl
alternative costwise? Mind you this MoBo is outdated and I want to repair it to prove
to myself that I can do it

There are some 'solid' or organic/polymer electrolyte caps out there now that are
suitable. I think Gigabyte for example has moved to using them. Having been burnt over
the bad caps issue, it decided to change over to them wholesale.

Graham

 

[Eeyore]

What I would like to know is can I replace electrolytic capacitors with solid state
(like tanatalum) capacitors that do not either dry up or leak.Is it a reasonabl
alternative costwise? Mind you this MoBo is outdated and I want to repair it to prove
to myself that I can do it

http://www.gigabyte.com.tw/FileList/NewTech/2006_motherboard_newtech/article_02_all_solid.htm

 

[[email protected]]

check the badcaps.net and when I tried to find some replacements, the local

Someone sells small quantities of 105 degree low ESR electrolytics on
Ebay.

-Michael A. Terrell

Yes.Someonr else mentioned it.Its chinese company and I ordered a package from them. It
took 11 days to get to Vancouver B.C from China and for the last six days, the package is
sitting there. I presume that Canadian Customs are taking a good look(?) .

regards
harsha godavari

 

[[email protected]]

There are some 'solid' or organic/polymer electrolyte caps out there now that are
suitable. I think Gigabyte for example has moved to using them. Having been burnt over
the bad caps issue, it decided to change over to them wholesale.

Graham

Yes thats the kind to look for ,next time if I get the itch once again

regards
hg.

 

[Michael A. Terrell]

Yes.Someone else mentioned it. Its chinese company and I ordered a package from them. It
took 11 days to get to Vancouver B.C from China and for the last six days, the package is
sitting there. I presume that Canadian Customs are taking a good look(?) .

No, you'll have to reorder. The guys in customs needed the caps for
THEIR computer! ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida