Removing the I/O board.......................................................... 53Prerequisites.....................................................................................................53Procedure.........................................................................................................53Replacing the I/O board...........................................................55Procedure.........................................................................................................55Post-requisites................................................................................................. 55Removing the heat-sink assembly......................................... 56Prerequisites.....................................................................................................56Procedure (discrete graphics card).................................................................56Procedure (integrated graphics card)............................................................. 57Replacing the heat-sink assembly......................................... 59Procedure........................................................................................................ 59Post-requisites................................................................................................. 59Removing the system board....................................................61Prerequisites..................................................................................................... 61Procedure........................................................................................................ 62Replacing the system board....................................................66Procedure........................................................................................................ 66Post-requisites................................................................................................. 67Removing the battery-connector board.............................. 68Prerequisites.................................................................................................... 68Procedure........................................................................................................ 68Replacing the battery-connector board...............................70Procedure........................................................................................................ 70Post-requisites................................................................................................. 706