29 Aug '15, 8pm

CO2 Laser Decapping to Fix Soldering Mistake

CO2 Laser Decapping to Fix Soldering Mistake

[Carsten] messed up. He was soldering an ARM CPU onto a quadcopter board in haste, failed to notice that the soldering iron was turned up to eleven, and pulled some of the traces up off the PCB. In the process of trying to fix that, he broke three pins off of the 100-pin CPU. The situation was going from bad to worse. Instead of admitting defeat, or maybe reflowing the CPU off of the board, [Carsten] lasered the epoxy case off of the chip down to the lead frame and worked a little magic with some magnet wire. A sweet piece of work, to be sure! Of course, we’ve covered decapping chips with nasty chemicals a number of times before , but we think that the ease of removing the epoxy case with a widely available laser cutter is a quantum leap in convenience. In [Carsten]’s case, it made it worth attempting a decap instead of board rework. Indeed, we’ve just featured another pro...

Full article: http://hackaday.com/2015/08/29/co2-laser-decapping-to-fix...

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