LG G4 Repair Manual

The LG G4 is a high-performance smartphone featuring a 5.5-inch Quad HD IPS Quantum Display, Qualcomm Snapdragon 808 processor, 16MP camera with f/1.8 aperture and OIS, 3GB RAM, 32GB storage with microSD expansion, removable 3000mAh battery, and Android 5.1 Lollipop. This repair manual provides comprehensive guidance for disassembly, component replacement, troubleshooting, and reassembly procedures.

Safety Precautions

Before beginning any repair, ensure proper safety measures are followed to prevent injury and device damage.

Precaution	Description
Power Off Device	Always turn off and disconnect power before repair
ESD Protection	Use anti-static wrist strap to prevent electrostatic discharge
Battery Removal	Remove battery before internal repairs
Proper Tools	Use appropriate tools to avoid component damage
Work Area	Clean, well-lit workspace with adequate ventilation
Component Handling	Handle delicate components with care
Heat Application	Use heat gun carefully to avoid damage
Cable Connections	Disconnect cables gently using proper tools

Required Tools

Essential tools for LG G4 repair and maintenance.

1. Phillips #000 screwdriver
2. Plastic opening tools and spudgers
3. Anti-static wrist strap
4. Heat gun or hair dryer
5. Suction cup for screen removal
6. Tweezers for small components
7. Prying tools for case separation
8. Isopropyl alcohol and microfiber cloth

WARNING! Using improper tools may cause permanent damage to device components.

Device Specifications

• Display: 5.5-inch Quad HD IPS Quantum (2560x1440)
• Processor: Qualcomm Snapdragon 808 Hexa-core
• RAM: 3GB LPDDR3
• Storage: 32GB internal, microSD expandable up to 2TB
• Camera: 16MP rear with OIS, f/1.8 aperture; 8MP front
• Battery: 3000mAh removable lithium-ion
• OS: Android 5.1 Lollipop (upgradable)
• Connectivity: 4G LTE, Wi-Fi 802.11ac, Bluetooth 4.1, NFC
• Ports: Micro-USB 2.0, 3.5mm audio jack

Disassembly Procedure

Step-by-step guide to safely disassemble the LG G4.

1. Power off device and remove back cover
2. Remove battery by lifting from bottom edge
3. Remove SIM card and microSD card if present
4. Remove 10 Phillips screws from rear frame
5. Apply heat around display edges to loosen adhesive
6. Use suction cup to lift screen assembly
7. Carefully separate display from mid-frame
8. Disconnect display and digitizer flex cables
9. Remove motherboard securing screws
10. Lift motherboard and disconnect remaining cables

CAUTION! Apply heat carefully to avoid damaging display components.

Component Replacement

Guidelines for replacing major components.

Component	Replacement Procedure
Display Assembly	Remove adhesive, disconnect cables, install new display
Battery	Simply remove old battery, insert new one
Rear Camera	Disconnect flex cable, remove module, install new
Front Camera	Remove display, disconnect cable, replace module
Charging Port	Disassemble device, desolder old port, install new
Speaker	Remove back cover, disconnect, replace speaker unit
Vibration Motor	Located under motherboard, careful removal required

Battery Replacement

Replacing the removable 3000mAh battery.

1. Power off device completely
2. Remove back cover by pulling from notch
3. Lift battery from bottom edge using finger grip
4. Insert new battery with contacts aligned properly
5. Replace back cover and power on device
6. Allow full charge cycle before heavy use

Tip: Use only genuine LG batteries for optimal performance and safety.

Screen Replacement

Complete display assembly replacement procedure.

1. Remove back cover and battery
2. Apply heat around display edges (2-3 minutes)
3. Use suction cup to create gap at top edge
4. Insert plastic opening tool and work around perimeter
5. Carefully lift display assembly from frame
6. Disconnect display and digitizer flex cables
7. Remove any remaining adhesive from frame
8. Apply new adhesive tape to frame
9. Connect new display cables and test functionality
10. Press display into frame and apply even pressure

WARNING! Handle display carefully to avoid cracking glass or damaging digitizer.

Camera Module Replacement

Replacing front and rear camera modules.

Rear Camera (16MP): Remove back cover and battery, disconnect flex cable, lift camera module, install replacement, reconnect cable.

Front Camera (8MP): Requires display removal, locate front camera module, disconnect flex cable, replace module, reassemble display.

Charging Port Repair

Micro-USB port replacement procedure.

1. Complete disassembly to access motherboard
2. Locate charging port on motherboard
3. Use soldering iron to remove old port
4. Clean solder pads with flux and wick
5. Position new charging port correctly
6. Solder all connection points securely
7. Test charging functionality before reassembly

CAUTION! Proper soldering technique required to avoid motherboard damage.

Reassembly Guide

Reverse disassembly procedure for reassembly.

1. Reconnect all flex cables to motherboard
2. Secure motherboard with screws
3. Connect display and digitizer cables
4. Apply new adhesive to frame
5. Carefully position display assembly
6. Press evenly to secure adhesive bond
7. Replace all Phillips screws
8. Insert battery and replace back cover
9. Power on and test all functions

Tip: Test device functionality at each reassembly stage.

Troubleshooting

Issue	Possible Cause	Solution
Device won't power on	Dead battery, power button issue	Charge battery, check power button flex cable
Screen not responding	Digitizer damage, loose cable	Replace digitizer, check cable connection
Camera not working	Module failure, cable issue	Replace camera module, check flex cable
Not charging	Port damage, battery issue	Replace charging port, test with known good battery
Overheating	Battery issue, processor stress	Replace battery, check for background apps
No sound	Speaker failure, audio IC	Replace speaker, check audio flex cable

Factory Reset: Volume Down + Power button to access recovery mode.

LG Support: 1-800-243-0000; www.lg.com/us/support