Latitude 5591 Service Manual

Removing the system board

1. Follow the procedure in Before working inside your computer.
2. Remove the:
   1. SIM card module
   2. base cover
   3. battery
   4. WLAN card
   5. WWAN card
   6. SSD cardor hard drive
   7. system fan
   8. memory module
   9. heat sink
   10. coin cell battery
   11. Power connector port
   12. chassis frame
3. To release the system board:
   1. Disconnect the IR camera cable [1] and remove the M2x5 screws that secures the metal bracket to the system board [2].
   2. Lift the metal bracket that secures the display cable to the system board [3].
   3. Disconnect the display cable from the connectors on the system board [4].
   4. Disconnect the power connector on the system board [5].
   
4. To remove the system board:
   1. Lift the latch and disconnect the LED board, mother board and touchpad cable from the connectors on the system board [1].
   2. Remove the M2x5 screws (2) that secure the metal USB-C port bracket to the system board and lift the bracket away from the system board [2,3].
      NOTE The metal bracket referred is the USB-C port bracket.
   
5. Remove the M2x3 screws (3) and lift the system board away from the computer [1, 2].