Dell Latitude 5420 Rugged Service Manual

Removing the Rear I-O board

1. Follow the procedure in Before working inside your computer.
   NOTE A 5 mm socket wrench should be used to remove/install the caps screws located in rear I/O space.
2. Remove the:
   1. Batteries
   2. WLAN card
   3. WWAN card
   4. PCIe heatsink fan assembly
   5. Docking port assembly
   6. Bottom chassis Cover
   CAUTION The following epoxy screw locations will require additional focus. These screws are difficult to remove and there may be damage during the removal process. To prevent damage to the screws and surrounding plastics, please use the correct screwdriver for each screw type.
3. Loosen the two epoxy cap screws on the serial port in the rear I/O space [1].
4. Peel off the inductive tape on the I/O board FPC connector [2] and disconnect it [3] from the system board.
   
5. Loosen the three 'M2.5*5' screws [1] and lift the I/O board away from the system [2].