Phone · LG · V40 ThinQ
LG V40 ThinQ Logic Board Repair
Logic Board Repair guide for the LG V40 ThinQ
Before you begin
Tools
- Heat gun or hair dryer
- Suction cup tool
- Plastic prying tools
- Precision screwdriver set (Phillips #000, #00)
- Tweezers
- Spudger tool
- Anti-static wrist strap
Parts / materials
- Pre-cut rear adhesive sticker
- Isopropyl alcohol (99%)
- Microfiber cleaning cloth
Safety
- Wear eye protection when heating and prying tempered glass panels.
- Disconnect the battery immediately after removing the midframe to prevent accidental electrical shorts.
- Wear an anti-static wrist strap to prevent ESD damage to sensitive integrated circuits on the logic board.
Overview
Step-by-step
- 1
Turn Off Phone
1 minPress and hold the Power button on the side, then tap Power Off on the screen. Ensure the device is fully powered down before proceeding.
- 2
Eject SIM Tray
1 minInsert a SIM eject tool into the hole beside the SIM card tray on the right edge. Press firmly to eject the tray and remove it completely.
- 3
Heat Rear Glass
3 minApply heat evenly around the outer edges of the rear glass cover for about 2 to 3 minutes to soften the adhesive.
- 4
Attach Suction Cup
2 minPlace a suction cup near the bottom edge of the glass back cover and pull upward gently to create a small gap.
- 5
Slice Rear Adhesive
5 minInsert a plastic opening pick into the gap and slowly slide it along the perimeter to slice through the adhesive seal.
- 6
Disconnect Fingerprint Sensor Flex
2 minSlightly lift the rear glass panel and use a plastic spudger to disconnect the fingerprint sensor press-connector from the motherboard.
- 7
Remove Rear Glass
1 minLift the rear glass cover away from the phone body and set it aside in a clean area.
- 8
Unscrew Midframe Assembly
4 minUse a Phillips #000 precision screwdriver to remove all 14 screws securing the upper wireless charging frame and speaker module.
- 9
Remove Upper Wireless Shield
2 minInsert the flat end of a spudger beneath the wireless charging coil assembly and lift it out of the chassis.
- 10
Remove Loudspeaker Module
2 minPry up the lower speaker housing assembly using a spudger and lift it clear of the body.
- 11
Disconnect Battery Press Connector
1 minUse a plastic spudger to disconnect the battery press connector from the logic board to eliminate power flow.
- 12
Disconnect Camera Modules
3 minDisconnect the flex cables for the front-facing and rear-facing camera modules attached to the logic board using tweezers or a spudger.
- 13
Disconnect Sub-Board and Display Flexes
3 minPop off the connectors for the main display cable, lower charging board interconnect flex, and side button cables.
- 14
Unscrew Logic Board Fastener
1 minLocate and remove the single Phillips #000 screw securing the top portion of the logic board to the frame.
- 15
Remove Logic Board
2 minGently lift the logic board by its top edges, ensuring no cables snag, and lift it completely out of the frame.
After your LG V40 ThinQ logic board repair
Power the V40 ThinQ back on and test the logic board repair function before you put every screw away. Check touch/display response, charging, cameras, buttons, and wireless as relevant to this repair. If something fails after closing the device, reopen carefully and reseat the connectors for this LG V40 ThinQ job before assuming the part is defective. Keep leftover adhesive and screws labeled in case you need a second pass.
Keep learning
Explore more LG V40 ThinQ repair context in the encyclopedia, or open related DIY guides.
