Precision 7680 Service Manual

Removing the system board

1. Carefully pry the outside end of the GPU power cable connector head to unlock the GPU power cable connector from the system board on the top side of the system.
2. Slightly slide the GPU power cable connector outwards to disconnect the GPU power cable from the connector on the system board.
3. Remove the four (M2x6) screws that secure the two PCB beam connectors to the system board and the GPU card.
   NOTE:For models shipped with an integrated GPU card, the PCB beam connectors are on the bottom and top-right side of the GPU card. For models shipped with a discrete GPU card, the PCB beam connectors are at the bottom side of the GPU card.
4. Remove the PCB beam connectors from the computer.
5. Remove the (M2x5) screw that secures the display cable bracket in place.
6. Remove the display cable bracket from the computer.
7. Disconnect the display cable from the connector on the system board.
8. Disconnect the power button board FFC from the system board, touchpad FFC, USH daughter board FFC (for models shipped with a USH daughter board), and SD card reader FPC cables.
9. Remove the seven (M2x5) screws that secure the system board to the computer chassis.
10. Remove the four standoff nuts (M2x3.5) that secure the CAMM memory.
    NOTE:This step is only applicable for configurations with CAMM memory.

    NOTE:In the case of system board replacement, these four standoff nuts must be transferred from the old system board to the new system board.
11. Flip the system board and disconnect the coin-cell battery cable from its connector on the system board.
12. Remove the system board from the computer.

    After removing the system board from the system, the following items MUST be transferred to the replacement system board:

    

    Table 1. System board replacement componentsThe following table provides the system board replacement components:

    Sl. No	Item
    1	WWAN card thermal pad (for models shipped with WWAN antennas)
    2	CPU graphite absorber sticker (for models shipped with WWAN antennas)
    3	CAMM memory absorber (for models shipped with a CAMM module)
    4	Hexagonal standoff nuts x4 (for models shipped with a CAMM module)

    NOTE:

    • The hexagonal standoff nuts can be removed with a flat-head screwdriver.
    • There are no absorbers or standoff nuts to be transferred for models that are shipped with a DIMM memory module and without WWAN antennas.