LG Full HD 1080p Repair Manual

The LG Full HD 1080p series represents LG's premium line of high-definition televisions featuring 1920x1080 resolution, advanced image processing technologies, multiple HDMI inputs, USB connectivity, Smart TV capabilities, and energy-efficient LED backlighting. This repair manual provides comprehensive guidance for authorized technicians covering disassembly procedures, component identification, troubleshooting methodologies, replacement parts specifications, and safety protocols for servicing LG Full HD 1080p television models.

1. Safety Precautions 2. Tools and Equipment 3. Disassembly Procedures 4. Component Identification 5. Troubleshooting Flowcharts 6. Power Supply Repair 7. Main Board Diagnostics 8. LCD Panel Service 9. Backlight System 10. Replacement Parts 11. Reassembly Guidelines

Safety Precautions

Critical safety measures for technicians working on LG Full HD 1080p televisions.

Hazard	Precaution
Electrical Shock	Disconnect power; discharge capacitors; use insulated tools
High Voltage	Backlight inverter circuits carry lethal voltages; proper grounding required
ESD Protection	Use anti-static wrist strap; work on grounded surface
LCD Panel	Handle carefully; avoid pressure on screen surface
Chemical Exposure	Use proper ventilation when working with cleaning solvents
Sharp Edges	Wear cut-resistant gloves during disassembly
Weight Hazard	Two-person lift required for screens over 32 inches
Battery Safety	Remove CMOS battery before soldering on main board

Tools and Equipment

Required tools for proper servicing of LG Full HD 1080p televisions.

Multimeter: Digital with capacitance and frequency measurement
ESD-safe screwdrivers: Phillips #00, #0, #1; Torx T8, T10
Soldering station: Temperature controlled with fine tips
Oscilloscope: 100MHz minimum for signal analysis
LCD panel separator tools: Plastic pry tools and suction handles
Backlight tester: LED strip diagnostic tool
Heat gun: For BGA rework and adhesive removal
Service remote: LG-specific for service menu access

WARNING! Use only manufacturer-approved tools to prevent damage to delicate components.

Disassembly Procedures

Step-by-step disassembly instructions for LG Full HD 1080p models.

Power disconnection: Unplug AC cord and wait 5 minutes for capacitor discharge
Rear cover removal: Remove stand if attached; unscrew all rear case screws
Separate chassis: Carefully pry plastic clips around perimeter
Shield removal: Remove metal RF shields to access main boards
Board disconnection: Document and disconnect all ribbon cables and connectors
LCD panel separation: Remove bezel screws; use suction cups for panel handling
Backlight access: Remove diffusion sheets and LED light strips

CAUTION! Mark all cable orientations; take photos during disassembly for reassembly reference.

Component Identification

Power Supply Board: AC input filtering, PFC circuit, main DC-DC conversion
Main Board: Video processing, tuner, input/output interfaces, microcontroller
T-Con Board: Timing controller for LCD panel signal distribution
LED Driver Board: Backlight power and dimming control
LCD Panel: 1920x1080 resolution with LED edge lighting
IR Board: Infrared receiver and front control buttons
Speaker System: Built-in stereo speakers with amplifier circuit
Wi-Fi Module: Wireless connectivity for Smart TV features

Troubleshooting Flowcharts

Systematic diagnostic approach for common LG Full HD 1080p issues.

No Power: Check AC input → Fuse continuity → Standby voltage → Main power supply → Main board power sequencing

No Picture/Sound OK: Backlight test → T-Con board voltages → LVDS signals → Panel VGH/VGL voltages

No Sound/Picture OK: Audio input selection → Volume settings → Speaker connections → Audio amplifier IC

Image Artifacts: T-Con ribbon cables → Gamma voltages → Source testing → Panel replacement verification

Smart TV Issues: Network connectivity → Software update → Factory reset → Main board replacement

Power Supply Repair

Diagnosis and repair procedures for power supply board issues.

Visual inspection: Check for burnt components, bulging capacitors, cracked solder joints
Fuse testing: Verify main AC fuse and secondary DC fuses for continuity
Standby voltage: Measure 5VSTBY on connector; if missing, check startup circuit
PFC circuit: Verify ~400VDC on main bulk capacitor during operation
Main voltages: Check 12V, 24V outputs under load conditions
Component testing: Diode mode check MOSFETs, rectifiers, and optocouplers
Load testing: Use dummy loads to verify power supply stability

Tip: Always replace PFC controller and main switcher ICs as pairs when either fails.

Main Board Diagnostics

Comprehensive testing procedures for the main system board.

Power sequencing: Verify proper voltage ramp-up sequence (5VSTBY → 3.3V → 1.8V → 1.2V)
Clock signals: Check crystal oscillators and clock distribution
Reset circuit: Verify power-on reset pulse timing and duration
Memory testing: Diagnostic patterns for DDR memory integrity
LVDS output: Verify differential video signals to T-Con board
HDMI inputs: Test each port with known good source devices
Software recovery: USB firmware update procedure for corrupted software
BGA rework: Proper heating profile for main processor and memory IC replacement

WARNING! Use exact replacement parts; incorrect main board versions may cause permanent damage.

LCD Panel Service

Handling and repair procedures for the LCD panel assembly.

Panel removal: Use suction cups; support evenly to prevent flex damage
T-Con board: Check VDD, VGH, VGL, VCOM voltages on panel tabs
Ribbon cables: Inspect for damage; clean contacts with isopropyl alcohol
Gate drivers: Test for shorted drivers causing vertical lines
Source drivers: Diagnose horizontal line issues and tab bonding problems
Panel testing: Use universal T-Con board for isolated panel verification
Polarizer replacement: Proper technique for removing and applying new polarizing films

CAUTION! LCD panels are fragile and not repairable if physically damaged; handle with extreme care.

Backlight System

LED backlight diagnosis and replacement procedures.

Issue	Symptom	Solution
LED Failure	Dark spots/sections	Replace individual LED strips; match specifications
Driver Circuit	No backlight/flashing	Test LED driver output; replace driver board if needed
Thermal Issues	Backlight dims over time	Check heatsinking; replace thermal pads/paste
Dimming Fault	No brightness control	Verify PWM signal from main board; replace driver IC
Power Supply	Insufficient voltage	Check backlight voltage supply; repair power board

Replacement Parts

Authorized replacement components for LG Full HD 1080p televisions.

Power Supply Boards: EAX12345678, EAX12345679 (model specific)
Main Boards: EBT12345678, EBT12345679 (firmware version critical)
T-Con Boards: 6870C-1234A, 6871C-1234B (panel specific)
LED Strips: 55" - EAY12345678, 65" - EAY12345679
LCD Panels: LC12345678, LC12345679 (complete assembly only)
IR Boards: EBR12345678 (universal for series)
Speakers: 8Ω, 10W x2 (stereo pair replacement)
Wi-Fi Modules: AWL12345678 (Smart TV models only)

Reassembly Guidelines

Proper reassembly procedures to ensure optimal performance and safety.

Cable routing: Follow original paths; avoid sharp bends and pinching
Grounding: Ensure all ground straps and screws are properly installed
Thermal management: Apply fresh thermal compound to heatsinks
Screw placement: Use correct screw lengths to avoid board damage
Shield installation: Replace all RF shields for EMI compliance
Bezel alignment: Ensure proper fit before final screw tightening
Functional testing: Complete system test before returning to customer

Final Check: Power on test → Input source verification → Audio/video quality assessment → Remote control function test → Network connectivity verification

Service Support: 1-800-243-0000; www.lgservice.com