How to replace the Display back cover assembly on a Latitude 3120

This 3D experience gives you the step by step process of replacing the Display back cover assembly and a Latitude 3120. The procedure will also include removing the Palmrest and Keyboard Assembly, Display assembly, Display bezel, Display panel, Front facing camera, Display cable, Display hinges and reinstalling them.

Removal

Palmrest and Keyboard Assembly

1. Identify the palmrest and keyboard assembly highlighted in blue.
2. Loosen the captive screws that secure the palmrest assembly.
3. Place the system on a flat surface with the keyboard facing up. Open the system to 180 degrees.
4. Use a plastic scribe, pry from the U-shaped recesses near the hinges at the top edge.
5. Use the scribe to pry open the top, left, and right sides of the palmrest.
6. Gently flip over the palmrest assembly.
7. Disconnect the battery cable, lift the latch and disconnect keyboard and touchpad cables.
8. Lift and remove the palmrest assembly and keyboard from the computer chassis.

Display assembly

1. Identify the display assembly highlighted in blue.
2. Remove the screw that secures the bracket to the wireless module (WLAN).
3. Lift the bracket off the wireless module.
4. Disconnect the antenna cables from the wireless module (WLAN).
5. Remove the screw that secures the display cable bracket to the system board.
6. Lift the right side to release and remove the display cable bracket.
7. Open the latch and disconnect the display cable from the system board.
8. Close the display to 120-130 degrees.
9. Remove the screw that secure the display assembly.
10. Remove the screws that secure the display assembly.
11. Release the hinges and remove the display assembly.

Display bezel

1. Positon the display assembly as shown.
2. Identify the display bezel highlighted in blue.
3. Peel off the disposable cosmetic mylar stickers that Covers the bezel screws.
4. Remove the screws that secure the display bezel on the display assembly.
5. Use a plastic scribe to carefully pry open the recesses near the left and right hinges on the bottom edge of the display bezel.
6. Use the scribe to pry open the top, left, and right sides of the display bezel.
7. Lift and remove the display bezel from the display assembly.

Display panel

1. Identify the display panel highlighted in blue.
2. Remove the screws that secure the display panel on the display assembly.
3. Gently flip over the display panel.
4. Peel off the mylar tape that secures the display cable on the rear of the display panel.
5. Peel off the rubber sticker from the display cable connector.
6. Disconnect the display cable from the connector on the display panel.
7. Lift and remove the display panel from the display assembly.

Front facing camera

1. Identify the front facing camera highlighted in blue.
2. Peel off the adhesive tape that secures the display connector to the front-facing camera module.
3. Disconnect the display cable from the front-facing camera module.
4. Use a plastic scribe to pry the front-facing camera module from the display cover.
5. Lift and remove the display panel from the display assembly.

Display cable

1. Identify the display cable highlighted in blue.
2. Peel off the tape from the left hinge that secures the display cable.
3. Unroute the display cable from the routing channel on the bottom-left side of the display cover.
4. Peel off the display cable from the display cover.

Display hinges

1. Identify the display hinges highlighted in blue.
2. Peel off the tape from right hinge that secures the WLAN antenna cables.
3. Open the display hinges to 45 degrees.
4. Remove the screws that secure the display hinges to the display assembly.
5. Remove the screws that secure the display hinges to the display assembly.
6. Remove the display hinges from the display assembly.

Display back cover assembly

1. After performing the preceding steps, you are left with the display cover assembly.

Install

Display back cover assembly

1. Identify the display back cover assembly location highlighted in blue.

Display hinges

1. Identify the display hinges location highlighted in blue.
2. Align and place the display hinges on the display assembly.
3. Install the screws that secure the display hinges to the display assembly.
4. Install the screws that secure the display hinges to the display assembly.
5. Affix the tape at the right hinge to secure the WLAN antenna cables.

Display cable

1. Identify the display cable location highlighted in blue.
2. Align and affix the display cable on the display cover.
3. Route the display cable through the routing channel on the bottom-left side of the display cover.
4. Affix the tape from the left hinge to secure the display cable.

Front facing camera

1. Identify the front facing camera location highlighted in blue.
2. Insert the front-facing camera module into the slot on the display cover.
3. Connect the display cable to the front-facing camera module.
4. Affix the adhesive tape to secure the display connector on the front-facing camera module.

Display panel

1. Identify the display panel location highlighted in blue.
2. Place the panel adjacent to system and upside down. Make sure the eDP cable connector is on the top of the panel.
3. Connect the display cable to the connector on the display panel.
4. Affix the rubber sticker on the display cable connector.
5. Affix the mylar tape to secure the display cable on the rear of the display panel.
6. Gently flip over the display panel and Align the display panel with the display assembly.
7. Replace the screws to secure the display panel on the display assembly.

Display bezel

1. Identify the display bezel location highlighted in blue.
2. Align the display bezel with the display assembly. Gently snap the display bezel into place.
3. Replace the screws to secure the display bezel on the display assembly.
4. Adhere the new stickers over the screws once the screws have been secured.

Display assembly

1. Identify the display assembly location highlighted in blue.
2. Open the hinges and align and place the display assembly on the computer chassis.
3. Install the screw that secure the display assembly.
4. Install the screws that secure the display assembly.
5. Open the display to 180 degrees.
6. Connect the display cable to the system board. Close the latch to secure.
7. Install the display cable bracket on the system board.
8. Install the screw to secure the display bracket to the system board.
9. Connect the WLAN black cable to the auxiliary (filled triangle).
10. Connect the WLAN white cable to the main (empty triangle).
11. Align the screw hole on the bracket with the screw hole on the wireless module.
12. Install the screw that secures the bracket and wireless module to the system.

Palmrest and Keyboard Assembly

1. Identify the palmrest and keyboard assembly location highlighted in blue.
2. Connect the battery cable keyboard and touchpad cables.Close the latch to secure.
3. Gently flip over the palmrest assembly with the keyboard facing downward.
4. Align the palmrest and press until it clicks into place.
5. Close the display assembly and position the system as shown.
6. Tighten the captive screws that secure the palmrest assembly.