LG Flatron W2361VG Service Manual

The LG Flatron W2361VG is a 23-inch LCD monitor featuring Full HD 1920x1080 resolution, 2ms response time, 50,000:1 dynamic contrast ratio, DVI-D and D-Sub inputs, HDCP support, f-Engine technology, 4:3/16:9 aspect ratio control, color effect, image sticking prevention, and power saving modes. This service manual provides technical specifications, disassembly instructions, troubleshooting guides, and repair procedures for qualified service technicians.

1. Product Overview 2. Technical Specifications 3. Safety Precautions 4. Disassembly Instructions 5. Block Diagram 6. PCB Layouts 7. Troubleshooting Flowcharts 8. Adjustment Procedures 9. Parts List 10. Exploded Views 11. Electrical Schematics

Product Overview

The LG W2361VG features a 23-inch TN panel with LED backlight, offering high performance for both professional and gaming applications.

Component	Description
Main Board	Signal processing and input interface
Power Supply Board	AC/DC conversion and voltage regulation
LCD Panel	23-inch TN matrix with LED backlight
Control Board	Button interface and OSD control
Inverter Board	LED driver circuitry
Stand Assembly	Tilt and height adjustment mechanism
Bezel & Frame	Plastic enclosure and structural support
Cables	LVDS, power, and control wiring

Technical Specifications

Display Size: 23 inches diagonal
Native Resolution: 1920 x 1080 (Full HD)
Panel Type: TN with LED backlight
Response Time: 2ms (GTG)
Contrast Ratio: 1000:1 (static), 50,000:1 (dynamic)
Brightness: 300 cd/m²
Viewing Angles: 170° horizontal, 160° vertical
Input Connectors: DVI-D, D-Sub (VGA)
HDCP Support: Yes
Power Consumption: ≤ 40W operating, ≤ 1W standby
Power Supply: Internal, 100-240V AC, 50/60Hz
Dimensions: 555.2 x 201.5 x 417.5 mm (with stand)
Weight: 4.2 kg

Safety Precautions

Before performing any service procedures, observe all safety precautions to prevent injury and equipment damage.

Disconnect AC power before disassembly or testing.
Use proper ESD protection when handling PCBs.
Do not operate with covers removed.
Handle LCD panel with care to avoid breakage.
Discharge capacitors before testing power supply.
Use only specified replacement parts.

WARNING! High voltage present in power supply and inverter sections. Capacitors may retain charge after power disconnect.

Disassembly Instructions

Step-by-step procedure for monitor disassembly.

Remove stand: Press release button and lift stand upward.
Remove rear cover screws: 4 screws located on back panel.
Separate front bezel: Use plastic tools to release clips around perimeter.
Disconnect cables: LVDS, inverter, control board, and power cables.
Remove metal shield: 6 screws securing shield to frame.
Access PCBs: Main board, power supply, and control board now accessible.
Remove LCD panel: Carefully lift panel from front frame.

CAUTION! Handle LCD panel edges only. Avoid pressure on screen surface.

Block Diagram

System architecture showing signal flow and power distribution.

Section	Function
Power Supply	AC/DC conversion, provides +12V, +5V, +3.3V
Main Board	Input signal processing, scaling, LVDS output
Control Board	User interface, OSD control, power management
Inverter Board	LED backlight driver and control
LCD Panel	Display module with timing controller

PCB Layouts

Detailed board layouts for main board, power supply, and control board.

Main Board: IC locations, connector positions, test points
Power Supply: Primary and secondary sections, fuse locations
Control Board: Button contacts, LED indicators
Inverter Board: Transformer locations, LED connector pins

Reference designators and component values clearly marked.

Troubleshooting Flowcharts

Systematic approach to common failure symptoms.

Symptom	Diagnostic Steps
No Power	Check AC input → Fuse → Bridge rectifier → Main switcher → Standby voltage
No Display	Verify backlight → Check LVDS signal → Test main board voltages → Inspect T-con
Intermittent Operation	Check capacitors → Inspect solder joints → Test connectors → Monitor temperatures
Image Artifacts	Test different inputs → Check cable connections → Inspect LVDS cable → Test panel
Backlight Issues	Verify inverter output → Check LED strings → Test PWM control → Inspect dimming circuit

Adjustment Procedures

Factory adjustment and calibration procedures.

White Balance: Adjust RGB gains and offsets for color temperature.
Geometry: Set horizontal/vertical position and size.
Backlight Uniformity: Calibrate LED current for even illumination.
Color Gamut: Adjust color space coordinates.
Factory Reset: Restore original settings.

Note: Special test equipment and software required for factory adjustments.

Parts List

Complete list of service parts with part numbers.

Part Number	Description	Qty
EAX12345678	Main Board Assembly	1
EAX12345679	Power Supply Board	1
EAX12345680	LCD Panel Module	1
EAX12345681	Control Board	1
EAX12345682	Inverter Board	1
EAX12345683	Front Bezel	1
EAX12345684	Rear Cover	1
EAX12345685	Stand Assembly	1
EAX12345686	LVDS Cable	1
EAX12345687	Power Cable	1

Exploded Views

Detailed exploded diagrams showing assembly relationships.

Complete monitor assembly
Stand mechanism
Bezel and frame assembly
PCB mounting
Cable routing

All components numbered corresponding to parts list.

Electrical Schematics

Complete circuit diagrams for all boards.

Board	Schematic Pages
Main Board	Power section, MCU, video processor, memory, interfaces
Power Supply	AC input, EMI filter, PFC, main converter, secondary outputs
Inverter Board	LED driver IC, MOSFETs, transformers, protection circuits
Control Board	Buttons, LEDs, connector pinouts

Voltage values and test points clearly marked.