The Icon Bar: General: Fix CMOS power broken track
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Fix CMOS power broken track |
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MarkieMark (12:55 14/2/2014)
Zarchos (20:22 14/2/2014)
apdl (08:53 15/2/2014)
Zarchos (09:51 15/2/2014)
MarkieMark (09:58 25/2/2014)
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Mark Usher |
Message #123027, posted by MarkieMark at 12:55, 14/2/2014 |
Member
Posts: 9
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Hi all
Powered up last week to find the CMOS battery had leaked. I removed and immediately started the cleanup with a vinegar solution etc. Closer inspection revealed part of a nearby track eaten away on one side of the 470k resistor.
https://dl.dropboxusercontent.com/u/10388542/IMG_0035.JPG
My question is how to fix? I don't have any SMD tools or skills. Can I lightly solder a wire from the 470k to Pin 8 on the 8583T CMOS clock?
________
-Mark |
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Xavier Louis Tardy |
Message #123029, posted by Zarchos at 20:22, 14/2/2014, in reply to message #123027 |
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Posts: 47
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Well if you're sure it's the normal connection path I can tell you I resurrected my A5000 (battery leakage issue) simply by soldering a thin wire directly to the CMOS chip.
It's ugly, 'in the air' but as I had used some flux to neatly clean both soldering areas, I'm confident it's definitely fixed. |
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David Holden |
Message #123030, posted by apdl at 08:53, 15/2/2014, in reply to message #123027 |
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Posts: 138
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My question is how to fix? I don't have any SMD tools or skills. Can I lightly solder a wire from the 470k to Pin 8 on the 8583T CMOS clock? Yes, but you'll probably find it easier to connect to the +Ve side of C70.
Alternatively, since soldering to metal that's already been corroded can be difficult, solder a 47R 1/8th watt resistor from the 'upstream' side of the resistor to C70. (Note it's 47R, not 470K as you said). |
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Xavier Louis Tardy |
Message #123031, posted by Zarchos at 09:51, 15/2/2014, in reply to message #123030 |
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Posts: 47
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And always use flux on old circuits, whether there's corrosion or not.
It's no luxury.
Flux will always give better soldering, reduce risks of dry joints.
The time spent with the soldering iron head when in contact with the chips will also be reduced to get a clean joint, so it means less danger of burning the chip.
[Edited by Zarchos at 11:42, 15/2/2014] |
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Mark Usher |
Message #123059, posted by MarkieMark at 09:58, 25/2/2014, in reply to message #123031 |
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Posts: 9
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Just a note to say thank you to Xavier and David (also for supplying the replacement batteries).
Bought some new solder (with flux!) and soldered a wire from the 47 resistor to pin 8 on the CMOS chip and all is well again. Now just looking for someone with an SMD setup to replace the floppy controller chip on another board!
[Edited by MarkieMark at 09:59, 25/2/2014] |
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The Icon Bar: General: Fix CMOS power broken track |
