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Old 21st November 2006, 02:10 AM   #1
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Question How to restore burnt/lifted traces?

I know that's bad, bad, bad... Especially when you have all driver's section as SMD's. Traces are burnt together with FET's and gate resistors. No pads to solder resistors anymore
What is my options on fixing this? It's tempting to restore traces with thin wires and then epoxy/glue whole darn thing on surface There must be a better way to do it
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Old 21st November 2006, 03:03 AM   #2
TO-3 is offline TO-3  Peru
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Default Re: How to restore burnt/lifted traces?

Quote:
Originally posted by valterdaw
I know that's bad, bad, bad... Especially when you have all driver's section as SMD's. Traces are burnt together with FET's and gate resistors. No pads to solder resistors anymore
What is my options on fixing this? It's tempting to restore traces with thin wires and then epoxy/glue whole darn thing on surface There must be a better way to do it
That's the way to do it.
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Old 21st November 2006, 03:41 AM   #3
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Default Re: How to restore burnt/lifted traces?

Quote:
Originally posted by valterdaw
I know that's bad, bad, bad... Especially when you have all driver's section as SMD's. Traces are burnt together with FET's and gate resistors. No pads to solder resistors anymore
What is my options on fixing this? It's tempting to restore traces with thin wires and then epoxy/glue whole darn thing on surface There must be a better way to do it


TO-3 is correct, and you can use 1/8 watt resistors for the SMD replacements and use the excess leads as trace replacement. Just a thought. If the board is burnt , then the material has become conductive carbon based material , so you might have to look at removing all the excess burnt PCB material and performing a serious hard wire using the devices lead frame lenghts to replace blasted copper traces. If the thru whole is carboned up, I usually use a exacto knife or dremel tool to drill and scrap away the carbonized material back to undamaged PCB material. Then feed the leads thru and around any contact with the board, so as not to create any short circuit connections.
Its tough work, at best, and sometimes not worth the efforts (Based on the amps real world value).
Good Luck on the salvage operation
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Old 21st November 2006, 06:15 AM   #4
dangus is offline dangus  Canada
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If you want to get fancy, you can lift good traces off some scrap board and use those instead of wire. (over)heat the trace with a soldering iron and it'll get easier to peel off the board)
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Old 21st November 2006, 12:54 PM   #5
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Thanks everyone! Last question: what glue/adhesive will work best for this "operation"?
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Old 21st November 2006, 02:10 PM   #6
TO-3 is offline TO-3  Peru
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Quote:
Originally posted by valterdaw
Thanks everyone! Last question: what glue/adhesive will work best for this "operation"?
You can use super glue. It will keep the wires from vibrating loose.
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Old 21st November 2006, 10:03 PM   #7
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If this is a Rockford amp, you can do something similar to what's shown in the attached image.

Goop is my adhesive of choice. Both epoxy and super glue produce extremely irritating fumes if heated so never use them where you'll possibly have to solder in the future.
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Old 21st November 2006, 10:06 PM   #8
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If you have a JL amp with drivers that have badly damaged the board, you can do something similar to what's shown in the attached photo.
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Old 21st November 2006, 10:10 PM   #9
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For short runs, resistor leads work well.
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Old 21st November 2006, 10:17 PM   #10
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For longer runs, you can use jumper wire. I use strands from old computer ribbon cables. It works well for small traces. You can use a short length that only replaces the damaged section or you can go from one end of the trace to the other.
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