Dell Inspiron 15 3521 Service Manual page 74

Steps
1. Place the I/O daughter-board under the right hinge and on the palm-rest and keyboard assembly.
2. Align the screw holes on the I/O daughter-board to the screw holes on the palm-rest and keyboard assembly.
3. Replace the three screws (M2x3.5) to secure the I/O daughter-board to the palm-rest and keyboard assembly.
4. Connect the fingerprint reader flexible printed cable to the connector on the I/O daughter-board, if applicable.
NOTE: This step applies only to systems shipped with a fingerprint reader installed.
5. Close the latch on the fingerprint reader flexible printed cable connector to secure it to the I/O daughter-board, if applicable.
NOTE: This step applies only to systems shipped with a fingerprint reader installed.
6. Connect the I/O daughter-board flexible flat cable to the connector on the I/O daughter-board.
7. Close the latch on the I/O daughter-board flexible flat cable connector to secure it to the I/O daughter-board.
8. Close the right hinge towards the I/O daughter board on the palm-rest and keyboard assembly.
9. Replace the two screws (M2.5x5) to secure the right hinge in place to the palm-rest and keyboard assembly.
Next steps
1. Install the display assembly.
2. Install the wireless card.
3. Install the base cover.
4. Install the secure digital
5. Follow the procedure in
74 Removing and installing components
card.
After working inside your computer.