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Missing PCB pad.
Missing PCB pad.
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Old 19th May 2020, 08:27 PM   #1
templetec is offline templetec  Canada
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Join Date: Dec 2011
Default Missing PCB pad.

Just replacing some damaged caps in an Audiolab 8200CDQ. This is the second time this has been done as I have power supply issues where I live. The first recap was done by an IAG certified tech. When I unsoldered the caps I noticed to of the pads on the underside of the board are missing. They are intact on the surface. Can I still solder to these? Just use more solder so it runs through the bottom to the surface pads? What’re your thoughts?
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Last edited by templetec; 20th May 2020 at 03:32 AM. Reason: Typo
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Old 20th May 2020, 09:10 AM   #2
russc is offline russc  England
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Don't know. Try this -
https://www.instructables.com/id/Rep...Vias-on-a-PCB/
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Old 20th May 2020, 09:17 AM   #3
russc is offline russc  England
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Eyelets from RS Components or Ebay.
You'd have to improvise the setting tool as they are expensive.
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Old 21st May 2020, 09:08 PM   #4
templetec is offline templetec  Canada
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I got it. Still had good contacts on the top of the board; continuity was good. I just started the cap up about 1/2” off the board, lots of flux in the hole then put a nice spot of solder and quickly slid the cap down and flush. From the underside I could see a nice clean plug of solder through the eyelet. I then soldered the underside just to be sure. All back together... works and sounds great.
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Old 22nd May 2020, 11:48 AM   #5
russc is offline russc  England
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Good stuff - hope they last.
I suppose eyelets would have been useful should you ever need to replace the caps again to avoid further PCB damage.
Also, as these seem to be a regular replacement item for you, had you left the cap say 5mm up, you could cut the legs for easy removal.
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Old 22nd May 2020, 01:08 PM   #6
templetec is offline templetec  Canada
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Join Date: Dec 2011
Default If I replace them again

Quote:
Originally Posted by russc View Post
Good stuff - hope they last.
I suppose eyelets would have been useful should you ever need to replace the caps again to avoid further PCB damage.
Also, as these seem to be a regular replacement item for you, had you left the cap say 5mm up, you could cut the legs for easy removal.
If I need to do the caps again Iíll just use the excess leads on the caps to jump the traces. I did a continuity test to see which way the circuit ran so going old school with wires would have been my next move if I couldnít make a clean connection. Hopefully I wonít ever have to do this again! I have an APC audio UPS now. Thanks for your comment. 🙂
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