LG ACC55T - 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 ACC55T Specifications

General

Brand	LG
Model	ACC55T
Category	Receiver
Language	English

Summary

SECTION 1. GENERAL

SERVICING PRECAUTIONS

Notes regarding handling of the pick-up. Includes transport, storage, repair, and cleaning.

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

Precautions for handling components sensitive to static electricity during CD player repairs.

ESD PRECAUTIONS

Procedures to reduce component damage caused by static electricity during handling.

SECTION 2. AUDIO PART

AUDIO TROUBLESHOOTING GUIDE

Flowchart for diagnosing and resolving audio-related issues in the system.

FRONT CIRCUIT (1;2)

Troubleshooting flowchart for the front circuit of the device.

FRONT CIRCUIT (2;2)

Continuation of the front circuit troubleshooting flowchart.

SCHEMATIC DIAGRAMS

1. POWER SCHEMATIC DIAGRAM_1

Detailed circuit diagram for the power supply section (Part 1).

2. POWER SCHEMATIC DIAGRAM_2

Detailed circuit diagram for the power supply section (Part 2).

3. MICOM SCHEMATIC DIAGRAM

Detailed circuit diagram for the microcontroller (MICOM) section.

4. FRONT SCHEMATIC DIAGRAM

5. DSP&AMP SCHEMATIC DIAGRAM

Detailed circuit diagram for the Digital Signal Processor (DSP) and Amplifier sections.

6. I;O SCHEMATIC DIAGRAM

PRINTED CIRCUIT BOARD DIAGRAMS

1. MAIN;DVD P.C. BOARD DIAGRAM (TOP VIEW)

2. MAIN;DVD P.C. BOARD DIAGRAM (BOTTOM VIEW)

4. SMPS P.C. BOARD

Layout of the Switch Mode Power Supply (SMPS) circuit board.

6. AMP P.C. BOARD

Layout of the amplifier circuit board (Top & Bottom Views).

SECTION 3. DVD & AMP PART

1. System operation flow

Flowchart illustrating the system's power-on and basic operation sequence.

2. Test & debug flow

Flowchart for testing and debugging system functionality, including power and flash updates.

3. AUDIO μ-COM Circuit(DVD & AMP)

Troubleshooting guide for the audio microcontroller circuit in DVD and amplifier sections.

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

1) ES6698 FD main clock is at 27 MHz(X501)

Oscilloscope waveform showing the 27MHz main clock signal of the ES6698FD chip.

2) ES6698 FD reset is high active.

Oscilloscope waveform showing the reset signal behavior for ES6698FD.

SDRAM CLOCK

Laser Power Control Related Signal(No Disc Condition)

Oscilloscope waveforms for laser power control signals without a disc.

TRACKING CONTROL RELATED SIGNAL(System checking)

Oscilloscope waveforms for tracking control signals during system check.

RF WAVEFORM

Oscilloscope waveforms of the Radio Frequency (RF) signal.

AUDIO OUTPUT FROM PWM IC

< REFERENCE > RECEIVER ELECTRICAL

5-2-2. RX MODULE SCHEMATIC DIAGRAM_1

5-2-3. RX MODULE SCHEMATIC DIAGRAM_2

5-2-4. RX MODULE SCHEMATIC DIAGRAM_3

5-2-5. RX AMP SCHEMATIC DIAGRAM_1

5-2-6. RX AMP SCHEMATIC DIAGRAM_2

5-2-7. RX AMP SCHEMATIC DIAGRAM_3

5-2-8. RX MODULE + AMP SCHEMATIC DIAGRAM

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

5-2-12. AMP PRINTED CIRCUITED DIAGRAM(UPPER SIDE)

5-2-14. RX SMPS(POWER) PRINTED CIRCUITED DIAGRAM(COMPONENT SIDE)