This is the 12C over sockets machine’a encoders that I have been plugging and unplugging fairly viciously and this appears to be the result. The MCP23017 seems to fail with a pretty solid short circuit from +Vdc to 0V and it’s removal is ‘difficult’. I’ve used the old trick of levering from one end and continually melting the solder on the pins which I have used before ( I’ve even reused 16 pin CMOS IC’s after doing this in student times when getting hold of chips was a little more involved than amazon…)
IT’s the first time I’ve tried it with a 28 pin beastie and it’s also the first time I’ve seen inside a DIL package . . .
Not entirely sure the board is going to survive this process.