LG K40 Screen Assembly Replacement
The repair involves disassembling and reassembling several components, with the most challenging aspect being the numerous clips securing them in place.
Step 1 | Back Glass Removal Pt.1
Apply heat to the back of the device.
- Pierce with a suitable opening pick, applying isopropyl alcohol as needed.
- Start at the bottom edge and work your way around.
Step 2 | Back Glass Removal Pt.2
Continue with the next step.
Step 3 | Back Glass Removal Pt.3
Complete any remaining loop or circuit.
- Verify that all connections are secure and intact.
Step 4 | Adhesive Cleanup
Remove any residual adhesive from the back glass area.
- Use a squeegee or adhesive scraper to gently remove excess adhesive.
- Wipe clean with a soft cloth to prevent scratches.
Step 5 | Disconnecting the Fingerprint Sensor
- Remove the back cover.
- Apply pressure to both sides of the fingerprint scanner flex connector to release its clips.
- Pull the back cover towards you and disconnect the fingerprint flex connector.
Step 6 | Midframe Removal Pt.1
Remove 15 Phillips screws.
- Start to disassemble the midframe. Note that additional clips hold it in place.
Step 7 | Midframe Removal Pt.2
Locate and release all midframe clips using a pry tool.
- Pry around the edges of the midframe until it separates.
- Focus on releasing clips from their mounts to reduce prying effort.
Step 8 | Disconnecting the Flex Connectors Pt.1
Disconnect the battery connector.
- Remove any cables connected to the motherboard.
- Next, target the flex connectors and begin removal from one end.
Step 9 | Disconnecting the Flex Connectors Pt.2
Disconnect the display.
Step 10 | Remove Sim Tray
- Remove the SIM tray.
- You may use a SIM ejector, needle, paper clip, or other preferred ejector tool to facilitate removal.
Step 11 | Motherboard Removal
Removing the SIM tray before this step will facilitate motherboard removal.
- Release the motherboard from its clips by moving around it.
- Pull the motherboard upwards, away from the charge port.
Step 12 | A Brief Look at the Motherboard
The main component is a single motherboard with no additional daughterboards.
Step 13 | Battery Removal
Use a hair dryer or heat gun to warm up the front of the phone, loosening the battery adhesive.
- Apply small amounts of isopropyl alcohol along the edges of the battery for easier removal.
Step 14 | Ear Speaker Removal
Avoid using alcohol, which can potentially damage the ear speaker.
- Warm the front of the phone with a hair dryer to loosen adhesive under the ear speaker.
Step 15 | Vibrate Motor Removal
Remove the vibrate motor. It may still be warm from the previous heating process.
If it's not warm enough, use a hair dryer to reheat or apply alcohol to loosen any adhesive.
Step 16 | The End
The device has been successfully disassembled in preparation for the screen assembly replacement.