In message  <[log in to unmask]> [log in to unmask] writes:
> TechNetters,
>         My problem starts with scratches on gold fingers, but during the
> replating repair procedure some parts (BGAs & or QFPs) are damaged by the
> voltage used during the process. Every possible way is being made to isolate
> these parts and to prevent them from being damaged, however it is not
> entirely effective. What other in-house repair process is there that I can
> use that is not destructive to the components already mounted? I would
> appreciate any help or information you can give me.
>
> Thanks...  Dale Marcum
>
> Sr. Quality Engineer
> Vitel Technologies, Inc.

1) There are a number of ways of bussing across the gold fingers to "contain"
the plating voltage, including temporarily soldering a wire across the extreme
inbound edges. I think they are all described in IPC-7721.

If you have tried all these, then...

2) You could try replacing the complete finger instead of replating a
scratched one. Replacement fingers are available which have a gold finish and
are mounted in place with an integral dry film epoxy. Again, it is a standard
IPC-7721 process. These parts are available from several vendors - we supply
the ones from Circuit Technology in MA, USA.

Peter
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Peter Swanson                                              Oxfordshire, England
INTERTRONICS
[log in to unmask]                  http://www.intertronics.co.uk

Suppliers of materials and consumables to the electronics & related industries
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