... light air flow in room, thickness of PCB, distribution of PCB cooper, etc. There is not a kind ... the temperature measuring wire must be put between PCB and 775CPU pedestal, closing to outboard(mainboard joint ... the tuyere bottom repeatedly, insure to make the PCB part of 775 pedestal smooth.2.Choose welding paste ... circuit. These problems also exsit on PCB, too damp PCB will cause ply’s short circuit and ...