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LG LHS-76SBS User Manual

LG LHS-76SBS
61 pages
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DVD/CD RECEIVER
SERVICE MANUAL
MODEL : LH-T7652SB/LHS-76SBC/LHS-76SBS/LHS-76SBWSERVICE MANUAL
MODEL : LH-T7652SB/LHS-76SBC/
LHS-76SBS/LHS-76SBW

Table of Contents

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LG LHS-76SBS Specifications

General IconGeneral
BrandLG
ModelLHS-76SBS
CategoryReceiver
LanguageEnglish

Summary

Section 1: General Information

Servicing Precautions for Pickup Handling

Notes regarding the careful handling and transport of the optical pickup unit.

Compact Disc Player Repair Precautions

Safety and handling guidelines for repairs involving ICs and static electricity.

Electrostatic Sensitive Devices (ESD) Precautions

Techniques to reduce component damage caused by static electricity.

EEPROM Service Information and Options

Details on detecting and editing EEPROM options for the device.

Specifications

General Specifications

General technical specifications including dimensions and operating conditions.

CD/DVD Specifications

Technical specifications for CD and DVD playback components.

Video Output Specifications

Specifications for the video output signal.

Tuner Specifications

Technical details for the FM and AM tuner sections.

Amplifier Specifications

Power output and input/output specifications for the amplifier.

Speaker Specifications

Impedance, frequency response, and power ratings for speakers.

Section 2: Audio Part

Audio Troubleshooting Guide - Power Supply

Flowchart for troubleshooting audio issues related to the power supply circuit.

Front Circuit Troubleshooting Guide (Part 1)

Troubleshooting flowchart for front circuits, including power and display.

Front Circuit Troubleshooting Guide (Part 2)

Continuation of the front circuit troubleshooting flowchart.

Wiring Diagram Overview

Diagram illustrating the interconnections between various PCBs and components.

System Block Diagram

Diagram showing the functional blocks and data flow within the system.

SMPS Power Circuit Diagram

Detailed schematic of the Switched-Mode Power Supply (SMPS) circuit.

Power Interface Circuit Diagram

Schematic showing the interface between power supply and other sections.

Micro-Com (Main) Circuit Diagram

Schematic for the main micro-controller unit and its peripherals.

Servo Circuit Diagram

Schematic detailing the servo control circuits for disc operations.

I/O Circuit Diagram

Schematic of the Input/Output interfaces, including AV, SCART, and component connections.

Microphone Circuit Diagram

Schematic for the microphone input circuit.

USB Circuit Diagram

Schematic for the USB interface circuit.

Microphone and USB Circuit Diagram

Combined schematic for microphone and USB interfaces.

HDMI Circuit Diagram (Optional)

Schematic for the optional HDMI interface.

Front Circuit Diagram

Schematic for the front panel controls and display.

Main P.C. Board Diagram (Top View)

Top view of the main printed circuit board layout.

Main P.C. Board Diagram (Bottom View)

Bottom view of the main printed circuit board layout.

SMPS P.C. Board Diagram

Diagram showing the physical layout of the SMPS printed circuit board.

Key P.C. Board Diagram (Top View)

Top view of the printed circuit board for front panel keys.

Timer P.C. Board Diagram (Top View)

Top view of the printed circuit board for timer functions.

Section 3: DVD & Amp Part

DVD & Amp Electrical Troubleshooting - Operation Flow

Flowchart detailing the system's operational sequence.

DVD & Amp Test and Debug Flow

Flowchart for testing and debugging the DVD and amplifier sections.

DVD & Amp Troubleshooting Continuation (A)

Continuation of troubleshooting, checking memory and tray signals.

DVD & Amp Troubleshooting Continuation (B)

Further troubleshooting for SLED movement and motor driver.

DVD & Amp Troubleshooting Continuation (C)

Troubleshooting for laser, disc ID, and spindle rotation issues.

DVD & Amp Troubleshooting Continuation (D)

Troubleshooting for focus, track, and playability issues.

DVD & Amp Troubleshooting Continuation (E)

Final troubleshooting steps for audio output and test completion.

Audio Micro-Com Circuit (DVD & Amp)

Troubleshooting flowchart for the audio micro-controller circuit.

Details and Waveforms on System Test and Debugging

System Clock, Reset, and Flash R/W Waveforms

Waveforms for system clock, reset signal, and Flash R/W operations.

SDRAM Clock Waveforms

Waveforms for the SDRAM clock signal.

Tray Open/Close Signal Waveforms

Waveforms for the tray open and close switch signals.

SLED Control Signal Waveforms (No Disc)

Waveforms related to SLED control in a no-disc condition.

Lens Control Signal Waveforms (No Disc)

Waveforms related to lens control in a no-disc condition.

Laser Power Control Signal Waveforms (No Disc)

Waveforms for laser power control in a no-disc condition.

Disc Type Judgement Waveforms

Waveforms used for judging disc types (DVD and CD).

Disc Type Judgement Waveforms (CD)

Waveforms for CD disc type judgement.

Focus Control Waveforms

Waveforms related to the focus control mechanism.

Spindle Control Waveforms (No Disc)

Waveforms for spindle control in a no-disc condition.

Tracking Control Signal Waveforms

Waveforms for tracking control during system checking.

ES6698FD Video Output Waveforms

Waveforms for the ES6698FD video output signal.

Audio Output Waveforms from PWM IC

Waveforms showing audio output from the PWM IC.

Audio Related Signal Waveforms

Waveforms for audio-related digital signals.

DVD & Amp Waveforms

Various test waveforms for DVD and amplifier sections.

DVD & Amp Circuit Diagrams

MPEG Circuit Diagram

Schematic diagram of the MPEG processing unit.

DSP Circuit Diagram

Schematic diagram of the Digital Signal Processor (DSP) unit.

Amplifier Circuit Diagram

Schematic diagram of the amplifier circuit.

Printed Circuit Board Diagrams

DSP P.C. Board Diagram (Top View)

Top view of the DSP printed circuit board.

Amplifier P.C. Board Diagram (Top View)

Top view of the Amplifier printed circuit board.

Section 4: Exploded Views

Cabinet and Main Frame Exploded View

Exploded view of the unit's cabinet and main frame assembly.

Deck Mechanism Exploded View (DP-10T)

Exploded view of the deck mechanism, including part numbers and descriptions.

Packing Accessory Diagram

Diagram illustrating the packing accessories included with the unit.

Section 5: Speaker Section

Center Speaker (LHS-76SBC) Exploded View

Exploded view of the center speaker assembly.

Front/Rear Speaker (LHS-76SBS) Exploded View

Exploded view of the front/rear speaker assembly.

Passive Subwoofer Speaker (LHS-76SBW) Exploded View

Exploded view of the passive subwoofer speaker assembly.

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