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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: TheBilgeRat on May 05, 2013, 04:43:48 AM
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Some lessons learned:
I lifted three pads some while doing this. I found no rhyme or reason to their lifting. On some I put the heat to them like nobodys business and nothing. Sometimes you are just going to lift a pad. Nothing that wasn't able to be bridged or fixed, so thank goodness for that.
cutting the SMD caps off the board with snips first makes the desoldering much easier.
three of the 5 caps on my processor board (3640?) were backwards! I'm glad I got them square before running her more. Several had leaked badly as well as a few on the motherboard proper.
Moral of the story - check your caps! They can be just as nasty as the batteries.
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Did you use a hot air rework station or just a solder iron?
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The leaked electrolyte damages the pads, and makes the solder more difficult to melt. All the heat and mechanical stress is just asking for trouble.
Next time try using a low-melting point solder like ChipQuik. I can almost guarantee you'll never lift another pad.
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My own A4000 I used a soldering iron to recap. Many of the pads lifted no matter how careful I was. Most of my 4000's caps are now non-SMT parts.
The A4000 I just recapped for a customer, I used my £40 Aoyue 8208 SMT rework station. Everything went perfectly, all caps replaced in just an hour or two.
I used just heat to remove caps and then put ChipQuik on the pads, placed the new cap, and melted the ChipQuik with the heat to fix the cap.
Worked beautifully.
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Yeah - just a good iron, some solder wick and patience.
I started cutting the caps after the third lift - no problems after that.
If I do any more like this, I'll definitely want a soldering station with hot air rework and chip quick. That will have to wait until I have more disposable income for that sort of thing. :)