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Help - Changing Capacitor on a card

dekez

dekez

dekez

Soldato
Joined
14 Apr 2009
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One of the capacitors has gone on my 8800GS, the card still works fine but the capacitor case has come off and has exposed the brown paper stuff below.

I went to get a replacement - the capacitor is a 220uF 16V low ESR.

The shop only had a 220uF 22V capacitor, but said this should be fine. I've been unable to find the exact capacitor online anywhere.

Question is - will it be ok to replace with the 22V one?

As far as my understanding goes the voltage rating is the max volts they can take before they fail, so it should be fine. And low ESR I don't really understand tbh.

What do you reckon? Thanks
 
yer that will work fine, the voltage is the max working voltage for the cap, just make sure it will fit and also make sure its the right way round..
 
Here's the offending capacitor, its fairly inthe open and at the edge of the card which should make it a bit easier.

My soldering iron is pretty old (been a few years since I've used it as well) I'll see what it's like when I dig it out but may need a new tip for it.

capbp.jpg
 
http://uk.farnell.com/panasonic/eeefpc221xap/capacitor-d8-case-220uf-16v-105/dp/1539479

* CAPACITOR, D8 CASE, 220UF, 16V, 105°C
* Capacitor Dielectric Type:Aluminium Electrolytic
* Capacitance:220µF
* Capacitance Tolerance:± 20%
* Voltage Rating:16V
* Effective Series Resistance:0.16ohm
* Series:FP
* Height:7.7mm
* Outside Diameter:6.3mm
* Capacitor Case Style:SMD
* Mounting Type:SMD
* Lead Spacing:1.8mm
* Operating Temperature Range:-55°C to +105°C
* AC Ripple Current:600mA
* Application:Low ESR
* Body Diameter:6.3mm
* Case Style:SMD
* External Length / Height:7.7mm
* Leakage Current:35.2µA
* Terminal Type:Surface Mount (SMD, SMT)
* Termination Type:SMD
 
You may actually need a low ESR capacitor. The higher resistance of the capacitor will make it heat up, and since the previous one has failed, i doubt that the extra heat will do any good. Just to play it safe, low esr caps cost slightly more, so i doubt they would have used one for no reason. The extra resistance could also affect the functioning of the circuit, depends on what that particular cap does.
 
It's done - girlfriend is away so dining room table = workshop :D

img0718eo.jpg


Success! Well the card is still working at any rate, here is the brand new cap:

img0714sb.jpg


And my soldering skills:

img0715ri.jpg


*cough* well, yes, less said about that the better! :p It has been years since I've soldered, my soldering iron was in a right state, and my solder sucky thing wasn't working so I had to heat up the solder in the holes and push it through, rather that removing the existing solder first then neatly reapplying new.

Anyway enough of the excuses, thanks for you help and suggestions guys. Time will tell if I should have used low ESR if it fails again, or if my shoddy soldering comes apart, but the card only cost £30 so no major loss if it does go.

Now to the task that I removed the card for in the first place, re-seating the heat sink, the card was running at over 100c doing folding at home 24/7, and peaking at 130c :eek: when it was a hot day (probably what caused the cap to fail).

Cheers :)
 
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