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Replacing Blown Caps, Can't Melt Solder...


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#1 stevenh78

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Posted 11 December 2008 - 08:23 PM

After doing the heatgun method, I blew a few of the big caps. I got replacements but can't seem to desolder them, the solder isn't melting. I've used every equipment at my disposal but still doesn't seem to work... I've used:

Metcal SP200
Hakko 936
Hakko 851
Weller 45W solder station

Is there anything you guys can suggest that can desolder these caps??

Thanks


#2 Arakon

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Posted 11 December 2008 - 08:32 PM

you'll need more power. the gnd pin on the caps is usually a very large ground plane, which transfers most heat away from the solder. you can try holding the iron down longer, but be careful that it doesn't damage the board.

#3 Mholt215

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Posted 11 December 2008 - 08:36 PM

Put some flux all over the solder before you try to desolder them, helps out SOOO much.. it breaks the surface tension of the solder.

#4 stevenh78

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Posted 11 December 2008 - 08:53 PM

Pretty much given up on the thing, used a lot of flux but still can't desolder, the Hakko and Metcal irons are over 60W so should have plenty of power, don't know why it won't desolder...
Will probably just sell it on ebay for spares...


#5 darthdrummer

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Posted 12 December 2008 - 03:51 AM

Flux may help, but what you really need is a hotter iron. Even with that it will take some time to heat the plane around the cap. I would suggest getting some extra solder on the tip then trying, This will help transfer as much heat as possible.

#6 wantin2mod

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Posted 12 December 2008 - 06:45 AM

Also, make sure the tip of your solder iron is CLEAN! A dirty tip won't conduct heat very well at all.

Clean + freshly tinned + flux should see you through.




Regards,
wantin2mod




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