Dell OptiPlex 5070 Small Form Factor Service Manual

Removing system board

1. Follow the procedure in Before working inside your computer.
2. Remove the:
   1. Side cover
   2. Coin cell
   3. Front bezel
   4. HDD assembly
   5. Hard drive and optical drive module
   6. Heatsink assembly
   7. Processor
   8. Memory module
   9. M.2 PCIe SSD
3. Disconnect the following cables:
   1. Intrusion switch
   2. Power switch
4. To remove the I/O panel:
   1. Remove the screw that secures the I/O panel [1].
   2. Rotate the I/O panel and remove it from the system [2].
   3. Disconnect the hard drive data cable [3], optical drive data cable [4] and power cable [5] from the connectors on the system board.
      
5. Disconnect the following cables from the connectors on the system board:
   1. Intrusion switch [1]
   2. CPU power [2]
   3. Power switch [3]
6. Unroute the PSU cables from the retention clips [4].
   
7. To remove the screws from the system board:
   1. Remove the 5 screws that secure the system board to the chassis [1].
   2. Remove the single screw used as a mounting point for M.2 SSD drive [2] and the standoff single (#6-32) screw [3] that secures the system board to the system [3].
      
8. To remove the system board:
   1. Lift and slide the system board away from the system [1, 2].