LG BP145 Service Manual

The LG BP145 is a Blu-ray Disc player featuring high-definition video playback, Dolby Digital audio support, USB connectivity, HDMI output, and network capabilities. This service manual provides comprehensive technical information for service technicians, including safety precautions, technical specifications, disassembly procedures, troubleshooting guides, and maintenance instructions.

1. Safety Precautions 2. Product Specifications 3. External Views 4. Internal Structure 5. Disassembly Procedure 6. PCB Layouts 7. Block Diagrams 8. Troubleshooting 9. Test Points 10. Replacement Parts 11. Firmware Update

Safety Precautions

Before servicing the LG BP145 Blu-ray player, observe all safety precautions to prevent injury and equipment damage.

Warning	Precaution
Electric Shock Hazard	Disconnect power before servicing. Use insulated tools.
Laser Safety	Do not view laser directly. Laser class 1 product.
ESD Protection	Use anti-static wrist strap when handling PCBs.
High Voltage	Power supply contains hazardous voltages when energized.
Heat Precautions	Allow unit to cool before disassembly.

Product Specifications

Model: LG BP145
Disc Compatibility: BD-ROM, BD-R/RE, DVD-Video, DVD±R/RW, CD-DA, CD-R/RW
Video Output: HDMI 1080p, Component, Composite
Audio Output: Dolby Digital, DTS, PCM
Connectivity: USB 2.0, Ethernet, Wi-Fi (optional)
Power Requirements: 120V AC, 60Hz, 15W
Dimensions: 430mm (W) x 54mm (H) x 219mm (D)
Weight: 2.1 kg

External Views

Front panel features: Power button, Eject button, USB port, Display window, Remote sensor. Rear panel: HDMI output, Component video, Composite video, Audio outputs, Ethernet port, Power input.

Internal Structure

Main components: Main PCB, Power Supply PCB, Drive Mechanism, Front Panel PCB, Operation PCB.

Main PCB: Contains main processor, memory, and video processing ICs
Power Supply: Provides +5V, +12V, +3.3V to various sections
Drive Mechanism: Blu-ray optical pickup and loading mechanism
Front Panel: Display and button controls

Disassembly Procedure

Step-by-step disassembly instructions for service access.

Remove bottom cover screws (8 pcs)
Separate top and bottom covers carefully
Disconnect all internal cable connectors
Remove main PCB mounting screws
Extract optical drive assembly

WARNING! Handle optical pickup with care to avoid damage.

PCB Layouts

Detailed PCB layouts showing component placement and test points.

PCB	Description
Main PCB	Central processing board with BGA chips
Power Supply	Switching power supply circuit
Front Panel	Display and control interface

Block Diagrams

System block diagrams showing signal flow and interconnections between components.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No Power	Power supply failure	Check fuse, power supply voltages
No Disc Reading	Optical pickup issue	Clean lens, check pickup connection
No Video Output	HDMI circuit failure	Check HDMI IC, output circuit
No Audio	Audio processing circuit	Check audio DAC, output stages
Disc Ejection Problem	Loading mechanism	Check loading motor, belts

Test Points

Critical test points for voltage measurements and signal analysis.

TP1: +5V STBY
TP2: +12V
TP3: +3.3V
TP4: System Clock
TP5: Reset Signal

Replacement Parts

List of commonly replaced parts and their part numbers.

Part	Part Number
Optical Pickup	AB12345678
Main PCB	CD98765432
Power Supply	EF45678901
Front Panel	GH23456789

Firmware Update

Procedure for updating player firmware via USB or network.

Download latest firmware from LG support website
Copy to USB drive (root directory)
Insert USB into player
Access service menu for firmware update
Do not power off during update process

CAUTION! Incorrect firmware may render player inoperable.