[dust2dust]

if there were no bridges,ps2 not work with m2 installed,but works when removed,then something is shorting when m2 is installed,on the heat plate maybe

were is the m2 positioned ?as per official diagram?
or as per magic3,1 if this is your position i guess the chip (red component,diode)is shorting against the heat removing plate when u reassemble

3 chips all do same i doubt its the chip,altough if diode shorts as i suggested above its possible the chips have blown now