LG 32LG5700 Service Manual

The LG 32LG5700 is a 32-inch LCD television featuring Full HD 1080p resolution, built-in digital and analog tuners, multiple HDMI inputs, USB connectivity, Smart TV functionality, energy-saving modes, and advanced picture processing technologies. This service manual provides comprehensive technical information for service technicians including disassembly procedures, circuit diagrams, troubleshooting guides, and replacement parts information.

1. Product Overview 2. Technical Specifications 3. Disassembly Instructions 4. Circuit Diagrams 5. Main Board Replacement 6. Power Supply Board 7. LCD Panel Replacement 8. Backlight System 9. Troubleshooting Flowcharts 10. Error Codes 11. Parts List

Product Overview

The LG 32LG5700 features a 32-inch LCD panel with LED backlighting, built-in Wi-Fi, multiple connectivity options, and LG's webOS smart platform.

Component	Description
Main Board	EAX65436801 - Processes video/audio signals
Power Supply	EAX65436701 - Provides power to all components
LCD Panel	LC320EXN - 32-inch Full HD LCD panel
T-Con Board	6870C-0594A - Timing controller for LCD panel
LED Backlight	Direct LED backlight system
Wi-Fi Module	Integrated 802.11ac wireless connectivity
Speakers	2x 10W stereo speakers

Technical Specifications

Screen Size: 32 inches LCD
Resolution: 1920 x 1080 Full HD
Backlight: LED
TV System: ATSC/NTSC/QAM
Connectivity: 3x HDMI, 2x USB, Component, Composite, RF Input
Smart TV: webOS 3.0
Power Consumption: 45W typical, 0.3W standby
Power Supply: 100-240V AC, 50/60Hz
Dimensions: 728.2 x 434.3 x 59.9 mm (without stand)
Weight: 5.2 kg (without stand)

Disassembly Instructions

Follow these steps to safely disassemble the television for service.

Remove stand: Lay TV face down on soft surface, remove screws holding stand.
Remove rear cover: Remove all screws from rear casing, carefully separate front and rear covers.
Disconnect cables: Note cable positions before disconnecting main board, power supply, and panel cables.
Remove main board: Unscrew mounting screws, carefully lift board from chassis.
Access power supply: Remove screws and disconnect all power connectors.

WARNING! Always disconnect power before disassembly. Handle LCD panel with care to avoid damage.

Circuit Diagrams

Complete schematic diagrams for all major circuits.

Diagram	Description
Main Board Schematic	EAX65436801 complete circuit diagram
Power Supply Schematic	EAX65436701 power circuit details
T-Con Board Schematic	6870C-0594A timing controller circuits
LED Driver Schematic	Backlight driver circuit diagram
Audio Amplifier	25W stereo amplifier circuit

Note: All schematics include component values and test points.

Main Board Replacement

Procedure for replacing the main logic board.

Disconnect all cables from main board including LVDS, power, and input/output connectors.
Remove mounting screws securing main board to chassis.
Carefully lift main board from chassis, noting orientation.
Install new main board EAX65436801, ensuring proper alignment.
Reconnect all cables in original positions.
Test functionality before reassembling casing.

CAUTION! Handle board by edges only. Use anti-static precautions.

Power Supply Board

Troubleshooting and replacement of power supply board EAX65436701.

Input: 100-240V AC, 50/60Hz
Outputs: +12V, +5V, +3.3V, +24V for backlight
Test Points: TP1 (+12V), TP2 (+5V), TP3 (+3.3V), TP4 (+24V)
Fuse: F101 (4A/250V)

Common Issues: No power - check fuse F101 and main capacitor C101. Intermittent power - check solder joints on transformer T101.

LCD Panel Replacement

Complete procedure for replacing the LC320EXN LCD panel.

Remove rear cover and all internal components.
Remove bezel screws and carefully separate front bezel from panel assembly.
Disconnect LVDS cable and backlight connectors from T-Con board.
Remove panel mounting brackets and carefully lift out damaged panel.
Install new LC320EXN panel, reassemble in reverse order.

WARNING! LCD panels are fragile. Handle with extreme care. Wear gloves to prevent fingerprint damage.

Backlight System

LED backlight system specifications and service procedures.

Parameter	Specification
LED Type	Direct LED backlight
LED Count	48 LEDs (24 per side)
Driver Voltage	24V DC
Current	120mA per string
Expected Life	50,000 hours

Backlight Replacement: Requires complete disassembly. Test individual LEDs before replacement.

Troubleshooting Flowcharts

Step-by-step diagnostic procedures for common issues.

No Power: Check AC input → Fuse → Standby voltage → Main power supply
No Picture/Sound: Check backlight → Main board voltages → T-Con board
No Backlight: Check LED driver → Backlight connectors → Individual LEDs
No Sound: Check audio settings → Audio amplifier → Speaker connections
No Smart Features: Check Wi-Fi connection → Software update → Main board

Error Codes

Diagnostic error codes and their meanings.

Error Code	Description	Solution
E1	Main board communication error	Replace main board
E2	Power supply fault	Check power supply board
E3	Backlight failure	Check LED backlight system
E4	T-Con board error	Replace T-Con board
E5	Temperature sensor fault	Check thermal management
E6	Panel communication error	Check LVDS cable and connections

Parts List

Replacement parts and their part numbers.

Part Description	Part Number
Main Board	EAX65436801
Power Supply Board	EAX65436701
LCD Panel	LC320EXN
T-Con Board	6870C-0594A
Remote Control	AKB75215001
Stand	AGS34034801
Wi-Fi Module	6840T-1298A
Speakers	AGS34034701 (pair)
LVDS Cable	6871Q-0351A
Power Button	AGS34034901

Ordering: Contact LG Parts Department at 1-800-243-0000 or visit www.lgparts.com