LG Optimus 3D Max LCD Replacement - LG Optimus 3D Max

Step 1 | LCD

Acquire:

New P720/P725 LCD
Small philips/crosstip screwdriver
Tiny slotted screwdriver
Guitar pick

Verify that you have all screws listed before proceeding.

Remove the 3 red-marked screws from the bottom plate.
Remove the 8 red-marked screws from the upper part.

Step 2

Insert the tiny screwdriver under the bottom plate.

Lift the plate.
Remove the bottom plate.

Step 3

Remove the frame by loosening it and then manually lifting it away.

Step 4

Locate the SIM and SD card board and the motherboard.

Begin by unpinning the relevant cables and pins marked in red.

Step 5

Remove the SIM and SD card board.

The SD card tray pin was previously removed.
Additionally, remove the circled red pin between the cameras.
Also, remove the bottom pin shown on the picture.
Carefully lift out the SIM and SD card board.

Step 6

Verify that the board is completely removed and free from any components or connectors.

Step 7

Remove the motherboard.

Important: Unpin the red marked pins first.
There are four on top and three below - ensure all seven are unconnected before proceeding.
Once freed, carefully remove the motherboard.

Step 8

Verify that all components and wires have been safely disconnected.

Confirm that no screws or clips remain attached to the removed board.

Step 9

Release the microUSB board's retaining sticker.

Unpin the cable's second connector.
Remove the gold foil marked with a red circle.

Step 10

Locate and identify the flex cable connected to the LCD, which needs to be removed.

Note: Flex cables with similar connectors are present; ensure correct identification before proceeding.
Look for the gold foil markings on the motherboard. The first area where the gold foil was removed should now expose two visible connectors.

Step 11

Careful handling is required as multiple pins need to be detached.

Use the guitar pick to separate the glass housing from the LCD screen's housing.
Examine the diagram provided for accurate detachment of the pins before proceeding.

Step 12

Do not attempt to remove glass completely as the flex cable pin will obstruct the opening.

Open the phone carefully, referencing the provided image for guidance.

Step 13

Careful handling required since the LCD is already damaged.

Use a slotted screwdriver to gently lift the LCD out of its housing.

Step 14

Do not attempt to remove the LCD panel yet.

Use a sharp small knife or a razor blade to carefully cut the flex cables close to the LCD.
Begin cutting where the upper red arrow indicates and work down to the second arrow, taking care to avoid damaging surrounding components.

Once the flex cables are cut, you should be able to remove the LCD panel.

Old flex cables will now be visible on the opposite side. These must also be removed as part of the replacement process.

Step 15

Be gentle when removing the gold foil under the cable, as tearing it apart will cause damage.

Locate the gold foil and begin to carefully pull it off, starting from where I marked with an arrow.
Continue until you reach a light blue foil that is attached to the gold foil; leave this attached.

You will need to tear the flex cable that lies beneath the black foil covering the battery compartment, as it will not reattach properly.

Remove the black foil and locate the red lines indicating where the flex cable is positioned.
Carefully pull the flex cable out of its compartment.

Step 16

Install the new LCD.
Carefully route the flex cable through the provided openings.

Note: Picture quality may be unclear; use judgment to determine correct routing.

Step 17

Verify that the flex cable has been worked through its designated opening.

Reattach the gold/blue foil to the new LCD flex cable, mimicking its original attachment on the old unit.

Ensure secure connection of the battery compartment cable; use duct tape if available or normal tape as a substitute.

You have completed the repair. Take note of your disassembly steps for reassembly purposes.

Step 18

Reassembly complete successfully. Check for any signs of damage or incorrect installation.

Verify all screws are tightened evenly and securely.
Test the phone to ensure functionality.

If you encounter issues, do not attempt further repairs without consulting a professional or the manufacturer's documentation.