LG LHS-55TBW User Manual

WIRELESS DVD RECEIVER
SERVICE MANUAL
MODEL : LH-W551TB
LHS-55TBC, LHS-55TBS,
LHS-55TBW,
ACC55T, ACC55R
MODEL : LH-W551TB LHS-55TBC, LHS-55TBS, LHS-55TBW, ACC55T, ACC55R
SERVICE MANUAL

LG LHS-55TBW Specifications

General

Brand	LG
Model	LHS-55TBW
Category	Receiver
Language	English

Summary

SECTION 1. GENERAL

SERVICING PRECAUTIONS

Important safety and handling guidelines for servicing the unit.

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

Specific advice for repairing CD players, focusing on ESD and handling.

ESD PRECAUTIONS

Detailed guidance on preventing damage from electrostatic discharge.

SECTION 2. AUDIO PART

AUDIO TROUBLESHOOTING GUIDE

Flowchart to diagnose and resolve audio-related issues.

SCHEMATIC DIAGRAMS

POWER SCHEMATIC DIAGRAM_1

Detailed circuit diagram for the power supply section, part 1.

POWER SCHEMATIC DIAGRAM_2

Detailed circuit diagram for the power supply section, part 2.

MICOM SCHEMATIC DIAGRAM

Circuit diagram for the microcontroller unit.

PRINTED CIRCUIT BOARD DIAGRAMS

MAIN/DVD P.C. BOARD DIAGRAM (TOP VIEW)

Component layout of the main/DVD PCB from the top.

MAIN/DVD P.C. BOARD DIAGRAM (BOTTOM VIEW)

Component layout of the main/DVD PCB from the bottom.

SECTION 3. DVD & AMP PART

System operation flow

Step-by-step guide to the unit's power-on and operational sequence.

Test & debug flow

Procedure for testing and debugging system functionality.

AUDIO μ-COM Circuit(DVD & AMP)

Troubleshooting flow for the audio microcontroller circuit.

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

DISC TYPE JUDGEMENT WAVEFORMS

Waveforms used to determine the type of disc inserted.

DVD PART SCHEMATIC DIAGRAMS

DVD MPEG & DSP SCHEMATIC DIAGRAM

Circuit diagram for the DVD MPEG and DSP sections.

RF & SERVO SCHEMATIC DIAGRAM

Circuit diagram for RF and servo control systems.

5-1. TRANSMITTER(TX) ELECTRICAL

5-1-1. TX MODULE BLOCK DIAGRAM

Block diagram of the transmitter module's electrical functions.

5-1-3. TX MODULE SCHEMATIC DIAGRAM_1

Schematic diagram for the transmitter module, part 1.

5-1-4. TX MODULE SCHEMATIC DIAGRAM_2

Schematic diagram for the transmitter module, part 2.

5-1-5. TX MODULE SCHEMATIC DIAGRAM_3

Schematic diagram for the transmitter module, part 3.

5-2. RECEIVER(RX) ELECTRICAL

5-2-1. RX MODULE BLOCK DIAGRAM

Block diagram of the receiver module's electrical functions.

5-2-2. RX MODULE SCHEMATIC DIAGRAM_1

Schematic diagram for the receiver module, part 1.

5-2-3. RX MODULE SCHEMATIC DIAGRAM_2

Schematic diagram for the receiver module, part 2.

5-2-4. RX MODULE SCHEMATIC DIAGRAM_3

5-2-9. RX SMPS(POWER) SCHEMATIC DIAGRAM