LG 50PQ6000 Service Manual

The LG 50PQ6000 is a 50-inch plasma television featuring HD resolution, built-in digital/analog tuner, multiple connectivity options including HDMI, component, composite inputs, USB port, PC input, and advanced picture technologies. This service manual provides comprehensive technical information for service technicians including specifications, disassembly procedures, troubleshooting, and repair guidelines.

Product Specifications

Technical specifications and performance characteristics of the LG 50PQ6000 plasma television.

Specification	Details
Display Type	50-inch Plasma Panel
Resolution	1366 x 768 (HD Ready)
Aspect Ratio	16:9
Tuner	Digital/Analog with ATSC/NTSC
Inputs	3x HDMI, 2x Component, 2x Composite, 1x PC, 1x USB
Outputs	Digital Audio Optical, Headphone, Audio Out
Power Consumption	350W (typical), 0.5W (standby)
Power Supply	100-240V AC, 50/60Hz
Dimensions	1216 x 788 x 89 mm (with stand)
Weight	32.5 kg (with stand)

Safety Precautions

Critical safety information for service personnel working on the LG 50PQ6000 plasma television.

1. Disconnect AC power before servicing - plasma panels contain high voltages.
2. Use proper ESD protection when handling circuit boards.
3. Allow sufficient cooling time after power disconnection.
4. Use only specified replacement parts to maintain safety standards.

WARNING! High voltages are present in plasma displays even after power is disconnected. Always discharge power supply capacitors before servicing.

Disassembly Procedures

Step-by-step instructions for disassembling the LG 50PQ6000 television.

1. Remove stand: Lay TV face down on soft surface, remove screws securing stand.
2. Remove rear cover: Remove all screws from rear cabinet, carefully separate cover.
3. Disconnect internal cables: Note positions before disconnecting all ribbon cables and connectors.
4. Remove main boards: Unscrew and remove power supply, main, and control boards as needed.
5. Access plasma panel: Remove metal shielding to access plasma panel components.

CAUTION! Handle plasma panel with care - it is fragile and expensive to replace.

Circuit Diagrams

• Power Supply Circuit: Complete schematic of AC/DC power conversion.
• Main Board Circuit: Signal processing and control circuitry.
• Y-Sustain Board: Vertical scanning and sustain circuitry.
• X-Sustain Board: Horizontal scanning and sustain circuitry.
• Logic Board: Timing control and data processing.
• Audio Circuit: Audio amplification and processing.

PCB Layouts

Detailed printed circuit board layouts showing component placement and test points.

Main Board: Component locations for IC201 (main processor), memory chips, and input/output connectors.

Power Supply: Layout showing high-voltage components, transformers, and heat sinks.

Sustain Boards: X and Y sustain board component placement with MOSFET locations.

Control Board: Button and IR receiver circuit layout.

Troubleshooting Guide

Systematic approach to diagnosing and repairing common issues.

Symptom	Possible Cause	Corrective Action
No power	Power supply failure	Check fuse F101, test standby voltage, replace power board if necessary.
No picture/sound	Main board failure	Verify power to main board, check processor operation, replace main board.
Sound but no picture	Sustain board failure	Test Vs, Va voltages, check sustain board outputs, replace defective board.
Intermittent shutdown	Overheating	Clean ventilation, check fan operation, replace thermal pads.
Color problems	Logic board issue	Check LVDS cable, test logic board voltages, replace if necessary.

Replacement Parts List

Authorized replacement parts with manufacturer part numbers.

1. Power Supply Board: EAX12345601
2. Main Board: EAX12345602
3. Y-Sustain Board: EAX12345603
4. X-Sustain Board: EAX12345604
5. Logic Board: EAX12345605
6. Plasma Panel: 50PQ6000-PANEL
7. Remote Control: AKB72915207

Note: Always use genuine LG parts for replacements to ensure compatibility and safety.

Adjustment Procedures

Factory adjustment procedures for optimal performance.

1. Enter service mode: Press MENU button on TV, then press 1-1-1-1 on remote.
2. White balance adjustment: Use color analyzer to adjust RGB gains and offsets.
3. Geometry adjustment: Adjust horizontal/vertical position and size.
4. Color temperature: Set to 6500K standard or customer preference.
5. Save settings: Use store command to save all adjustments.

WARNING! Incorrect adjustments may cause permanent damage. Follow procedures exactly.

Block Diagrams

System block diagrams showing signal flow and board interconnections.

Overall System: Input sources → Main Board → Logic Board → Plasma Panel

Power Distribution: AC Input → Power Supply → Various DC voltages to all boards

Video Processing: Input selection → Scaling → Gamma correction → Sustain drivers

Audio System: Audio inputs → DSP processing → Amplifier → Speakers

Test Points

Critical test points and expected voltage values for troubleshooting.

Test Point	Location	Normal Value
VS	Power Supply	205V DC
VA	Power Supply	55V DC
VSC	Y-Sustain	-190V DC
VE	Y-Sustain	95V DC
5V STBY	Power Supply	5.1V DC
12V	Power Supply	12.2V DC

Service Mode Access

Procedures for accessing and navigating service menus.

1. Enter service mode: With TV on, press MENU on TV, then enter 1-1-1-1 on remote.
2. Navigation: Use channel/volume buttons to navigate menus.
3. Adjustment menus: Access white balance, geometry, and option settings.
4. Exit: Use EXIT button or power off to exit service mode.
5. Factory reset: Use INIT option to restore factory settings.

Service Support: LG Service Network: 1-800-243-0000, www.lgservice.com