... ?The distribution of 775 pedestal’s PCB copper foil is not very uneven, The one closed to ... the outboard is subduple ground wire and power-up copper foil’s distribution, the subduple PCB closed to ... , water vapor spills over rapidly, makes the copper foil in chip’s inerior short circuit or open circuit ... measuring wire’s position? The distribution of Copper foil on PCB is irregular, on chip bottom, some ...