Installing The I/O Daughter-Board - Dell Inspiron 15 3521 Service Manual

Steps
1. Remove the two screws (M2.5x5) that secure the right hinge in place to the palm-rest and keyboard assembly.
2. Lift the right hinge away from the palm-rest and keyboard assembly to access the I/O daughter-board.
3. Lift the latch and disconnect the I/O daughter-board flexible flat cable from the connector on the I/O daughter-board.
4. Lift the latch and disconnect the fingerprint reader flexible printed cable from the I/O daughter-board, if applicable.
NOTE: This step applies only to systems shipped with a fingerprint reader installed.
5. Remove the three screws (M2x3.5) that secure the I/O daughter-board in place to the palm-rest and keyboard assembly.
6. Lift the I/O daughter-board off the palm-rest and keyboard assembly.

Installing the I/O daughter-board

Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following images indicate the location of the I/O daughter-board and provide a visual representation of the installation
procedure.
Removing and installing components 73