Subsequently there was a lot of
PCB “shotgunning” going on. This was the practice of making an educated guess
at what IC was causing the issue, and changing it. This meant a huge expense in
ICs, most of which were thought to be fine; it would be a solder problem
causing the fault (open or short under the BGA).
So they introduced an exercise of
sending the removed ICs to Retronix for IC Recovery, and putting them then back
into the repair loop. For IC Recovery were also sent 3rd time failed
PCBs.
This resulted in a 61% drop in IC
cost in the repair area, with no noticeable difference in test yields.
All the ICs were tested electrically by Retronix before being returned.
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