LG 42LE5300 Service Manual

The LG 42LE5300 is a 42-inch LED TV featuring Full HD 1080p resolution, built-in digital tuner, multiple HDMI inputs, USB connectivity, energy saving technology, and advanced picture processing. This service manual provides technical information for qualified service personnel 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. LED Backlight System 8. Troubleshooting Flowcharts 9. Error Codes 10. Parts List 11. Safety Precautions

Product Overview

The LG 42LE5300 LED TV features a slim design with edge-lit LED backlight technology. Key components include main board, power supply board, T-CON board, LED driver board, and panel assembly.

Component	Description
Main Board	EAX61743001 - Processes all inputs and controls TV functions
Power Supply Board	EAY62836601 - Provides power to all components
T-CON Board	6870C-0594A - Timing controller for LCD panel
LED Driver Board	Controls LED backlight array
Panel Assembly	LG Display 42-inch LCD panel
IR Sensor Board	Receives remote control signals
Key Button Board	Manual control buttons
Speaker Assembly	10W x 2 stereo speakers

Technical Specifications

Screen Size: 42 inches LED
Resolution: 1920 x 1080 Full HD
TV System: ATSC/NTSC/QAM
Inputs: HDMI x 3, Component x 1, Composite x 1, USB 2.0 x 2, RF Input
Sound Output: 10W + 10W (Stereo)
Power Consumption: 75W (typical), <0.5W (standby)
Power Supply: 100-240V AC, 50/60Hz
Operating Temperature: 0°C to 40°C
Dimensions: 38.2" x 24.6" x 1.5" (without stand)
Weight: 13.2 kg (without stand)

Disassembly Instructions

Follow these steps carefully to disassemble the TV for service.

Remove stand: Lay TV face down on soft surface, remove screws holding stand.
Remove rear cover: Remove all screws from rear cover, carefully separate cover from chassis.
Disconnect cables: Note positions before disconnecting all ribbon cables and connectors.
Remove main board: Remove mounting screws and disconnect all cables from main board.
Access power supply: Remove screws securing power supply board and disconnect cables.
Remove panel bezel: Carefully separate bezel clips around edges to access LCD panel.

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

Circuit Diagrams

Refer to detailed circuit diagrams for each board section. Main board includes HDMI input circuits, video processing, audio circuits, and microcontroller system.

Power Supply Section: AC input filtering, PFC circuit, main switching regulator, standby power supply, LED driver circuits.

Main Board: Video decoder, scaler, HDMI receivers, audio processor, tuner module, memory circuits.

T-CON Board: LVDS receiver, timing controller, gamma correction, source driver interfaces.

Main Board Replacement

Procedure for replacing the main board (EAX61743001).

Disconnect power and remove rear cover.
Disconnect all cables from main board including LVDS, power, speaker, IR, and input cables.
Remove mounting screws securing main board to chassis.
Carefully lift main board out of chassis.
Install new main board and secure with screws.
Reconnect all cables in original positions.
Test TV operation before reassembling.

Note: Main board replacement may require software update or initialization.

Power Supply Board

The power supply board (EAY62836601) provides multiple voltage outputs:

Output	Voltage	Current	Purpose
Standby	5V	1A	Standby power
Main	12V	5A	Main board power
Audio	15V	2A	Audio amplifier
LED Backlight	200V	300mA	LED array

Troubleshooting: Check fuse F101 (5A), main capacitor C101 (450V/150μF), and switching IC IC101.

LED Backlight System

The edge-lit LED system uses multiple LED strips along top and bottom edges.

LED strips: 42 LEDs total (21 top, 21 bottom)
LED driver: Constant current driver circuit on power supply board
Brightness control: PWM dimming controlled by main board
Protection: Over-current, over-voltage, and thermal protection

LED Replacement: Requires complete disassembly to access LED strips. Test individual LEDs before replacement.

Troubleshooting Flowcharts

Systematic approach to common problems.

Symptom	First Check	Next Steps
No Power	Check AC input, fuse	Test standby voltage, check power board
No Picture/Sound	Check backlight, main board power	Test main board outputs, LVDS signal
No Backlight	Check LED driver voltage	Test LED strips, driver circuits
No Sound	Check speaker connections	Test audio IC, input signals
No Video	Check input source, cables	Test video processor, T-CON board

Error Codes

Diagnostic codes displayed during self-test or service mode.

ERR 01: Main board communication error
ERR 02: Power supply fault
ERR 03: Backlight system error
ERR 04: T-CON board communication failure
ERR 05: Temperature sensor error
ERR 06: Fan failure (if applicable)

Service Mode: Enter by pressing MENU button on TV and remote simultaneously for 5 seconds.

Parts List

Part Number	Description	Qty
EAX61743001	Main Board Assembly	1
EAY62836601	Power Supply Board	1
6870C-0594A	T-CON Board	1
LGAC34932801	LED Strip Assembly	2
LGE34435201	IR Sensor Board	1
LGE34435301	Key Button Board	1
LGE34435401	Speaker Assembly	2
ANE52716901	Rear Cover	1

Safety Precautions

ELECTRICAL SAFETY: Always disconnect AC power before servicing. Discharge large capacitors before handling. Use insulated tools when working with live circuits.

LCD PANEL: Handle with extreme care. Do not touch surface with sharp objects. Use proper anti-static precautions.

LED BACKLIGHT: High voltage present on LED driver circuits. Do not short LED outputs.

DISPOSAL: Follow local regulations for disposal of electronic components and LCD panel.