Inspiron 15 3521 Service Manual

Installing the system board

About this task

The following image indicates the connectors on your system board.

1. I/O daughter-board FFC connector
2. eDP connector
3. DC-in port connector
4. Keyboard FFC connector
5. Keyboard-backlight FFC connector
6. Battery connector
7. Memory module connector
8. Touchpad FFC connector
9. Hard-drive FFC connector
10. Wireless card connector
11. Speaker cable connector
12. Solid-state drive connector

NOTE: When removing the system board to replace/access other parts, the system board can be installed with the system board thermal plate attached to it in order to simplify the procedure and preserve the thermal bond between the system board and system board thermal plate.

The following images indicate the location of the system board and provide a visual representation of the installation procedure.

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.

   

3. Replace the screw (M2x2) and the three screws (M2x3.5) to secure the system board to the palm-rest and keyboard assembly.
4. Connect the following cables to the system board:
   1. I/O daughter-board FFC
   2. Power-adapter port cable
   3. Keyboard FFC
   4. Keyboard-backlight FFC, if applicable
      NOTE: This step applies only to systems shipped with a keyboard backlight installed.
   5. Touchpad FFC
   6. Hard-disk drive FFC, if applicable
      NOTE: This step applies only to systems shipped with a 2.5-inch hard-disk drive installed.