Dell Inspiron 15 3521 Service Manual page 69

Steps
1. Place the system board (with the system board thermal plate, if applicable) on the palm-rest and keyboard assembly.
2. Align the screw holes on the system board with the screw holes on the palm-rest and keyboard assembly.
NOTE: When installing the system board with the system board thermal plate, replace the two screws (M2x5) to secure
the system board thermal plate to the palm-rest and keyboard assembly.
Removing and installing components 69