Tips on desoldering corroded IC-chips

larsovef · 11 May 2023, 18:51

I have an A500 that has had the a501-in-storage-battery-leak.
It has made the removal of the ram chips VERY hard. On the topside of the board, the dull solder is quite stubborn. Reflowing, fluxing, heating, hitting from both sides with two irons. Still won’t come loose. It’s almost as if the legs are cold welded on to the pads.

ICs are the worst since there are so many points that need to be cleared at once.

Any tips on how to remove chips and components with this issue?

Thanks!

pandy71 · 11 May 2023, 21:06

Usually fresh solder works OK (use traditional LC63 or any pre-ROHS solder alloy), you may also give a chance to low temp solders such as Chip Quick and similar...

Nobby_UK · 11 May 2023, 23:21

And if all that fails --- take a pair of side cutters to the legs

larsovef · 12 May 2023, 00:03

Quote:

Originally Posted by Nobby_UK

And if all that fails --- take a pair of side cutters to the legs

Yea, that is my next step(maybe). I’ve added fresh solder, soaked in vinegar all of the “classic” procedures. Higher heat on iron , air station while trying to lift the chip. There just seems to always be a tiny bit of solder stuck on each leg that won’t melt. As it’s become a part of the legs and pads. I’ll give it another shot tomorrow. Wiggling the legs don’t work as they are stuck and I don’t want to risk braking traces etc.
I’ve pretty much watched all of gadgetUKs/Chris’s videos.

giantclam · 12 May 2023, 01:30

Yep, cut them off, as per what I describe here ->> https://eab.abime.net/showpost.php?p...5&postcount=43

tommywiz · 25 May 2023, 07:24

Interesting. I have a 2000 that has chips like that. I did clean with vinegar but havent tried to desolder yet.

11 May 2023, 18:51	#1
larsovef Registered User Join Date: Oct 2021 Location: Trondheim Posts: 47	Tips on desoldering corroded IC-chips I have an A500 that has had the a501-in-storage-battery-leak. It has made the removal of the ram chips VERY hard. On the topside of the board, the dull solder is quite stubborn. Reflowing, fluxing, heating, hitting from both sides with two irons. Still won’t come loose. It’s almost as if the legs are cold welded on to the pads. ICs are the worst since there are so many points that need to be cleared at once. Any tips on how to remove chips and components with this issue? Thanks!

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11 May 2023, 21:06	#2
pandy71 Registered User Join Date: Jun 2010 Location: PL? Posts: 2,766	Usually fresh solder works OK (use traditional LC63 or any pre-ROHS solder alloy), you may also give a chance to low temp solders such as Chip Quick and similar...

11 May 2023, 23:21	#3
Nobby_UK Registered User Join Date: Jul 2013 Location: Liverpool Posts: 2,598	And if all that fails --- take a pair of side cutters to the legs

12 May 2023, 01:30	#5
giantclam Registered User Join Date: Jan 2015 Location: australia Posts: 486	Yep, cut them off, as per what I describe here ->> https://eab.abime.net/showpost.php?p...5&postcount=43

25 May 2023, 07:24	#6
tommywiz Registered User Join Date: Mar 2021 Location: Pampa/USA Posts: 52	Interesting. I have a 2000 that has chips like that. I did clean with vinegar but havent tried to desolder yet.

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