After reaching the conclusion that getting into the KL26 on board #2 is probably beyond my power, I dug out the good old Chip-Quik [1] and tried to let it do its magic. I think I may have removed some 32-QFN that way before, but I don't think I ever tried 48-QFN.
At first things didn't look too promising: the alloy just wouldn't stay near the pads. Apparently, it had oxydized quite a bit since the last time I used it and all the slag was getting in the way. After vigorously pushing it from the MCU, things improved - and suddenly the chip started to move. This is what the board looked like immediately after removal: http://downloads.qi-hardware.com/people/werner/anelok/tmp/brd2-btx-removal.jpg And this is after cleaning it: http://downloads.qi-hardware.com/people/werner/anelok/tmp/brd2-btx-cleaned.jpg As one can see, a few components in the immediate vicinity of the MCU had to be sacrificed in the name of progress, but besides that, the board suffered no damage. I then soldered a new MCU, replaced the capacitors that had perished, and tried to raise the board on SWD: http://downloads.qi-hardware.com/people/werner/anelok/tmp/brd2-btx-swd.jpg Phew. I've been wanting to see that for well over a month now. - Werner [1] http://www.digikey.com/product-detail/en/SMD1/SMD1-ND _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
