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LG LAS855M User Manual

LG LAS855M
81 pages
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SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Internal Use Only
Website http://biz.lgservice.com
JUNE, 2016
MODEL: LAS855M
MODEL: LAS855M
SMART Hi-Fi AUDIO
Wireless Multi-room Sound Bar
P/NO : AFN77441543

Table of Contents

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LG LAS855M Specifications

General IconGeneral
Package weight11000 g
Number of amplifier channels4.1 channels
Audio decodersDolby Digital, DTS
RMS rated power360 W
Surround modes quantity1
Audio Return Channel (ARC)Yes
Impedance4 Ω
Tweeter diameter13 mm
Soundbar speaker RMS power160 W
Signal-to-Noise Ratio (SNR)82 dB
Subwoofer typeActive subwoofer
Subwoofer locationSeparate
Subwoofer sensitivity85 dB
Subwoofer connectivityWireless
Bluetooth version4.0
USB 2.0 ports quantityUSB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Connectivity technologyWired & Wireless
FM radio-
Product colorSilver
Recommended usageHome theatre
Audio formats supportedAAC, AAC+, WAV, LPCM, OGG, WMA, AIFF, FLAC, MP3
AC input voltage100-240 V
AC input frequency50 - 60 Hz
Power consumption (standby)0.5 W
Power consumption (typical)45 W
Magnetically shieldedNo
Weight and Dimensions IconWeight and Dimensions
Depth82 mm
Width1200 mm
Height43 mm
Soundbar weight2700 g
Subwoofer depth261 mm
Subwoofer width171 mm
Subwoofer height390 mm
Subwoofer weight5600 g

Summary

Section 1 Summary

Product Safety Servicing Guidelines

Guidelines for safe servicing practices for audio products, including hazard warnings and precautions.

Servicing Precautions

General safety measures and procedures for handling components and performing maintenance on audio products.

Wireless Subwoofer Connection

Instructions for pairing and troubleshooting the wireless subwoofer connection, including LED status indicators.

Software Update Guide

Procedures for updating device firmware via USB or a mobile application, detailing steps and file requirements.

Hidden Key Mode

Steps to access hidden functions like factory reset, network reset, and version checks using specific button sequences.

Specifications

Technical details on power, dimensions, operating conditions, input/output, amplifier, and connectivity specifications.

Section 2 Electrical

One Point Repair Guide

Troubleshooting guides for specific faults like no sound, no boot, or voltage issues, identifying faulty components.

Electrical Troubleshooting Guide

Flowcharts for diagnosing electrical issues related to power, Wi-Fi, Bluetooth, optical, portable, and HDMI functions.

Waveforms of Major Check Point

Reference waveforms for critical signals (MPEG, PWM, MICOM EEPROM) to aid in diagnosing circuit performance.

Wiring Diagram

Visual representation of internal cable connections between the main unit, amplifier, and other modules.

Block Diagrams

System and power block diagrams illustrating the overall architecture and power distribution within the device.

Circuit Diagrams

Detailed schematics for various circuit sections, including Micom, MPEG, Memory, AMP, and DC-DC converters.

Circuit Voltage Chart

A table listing key ICs with their specified and real voltage values for troubleshooting power-related problems.

Printed Circuit Board Diagrams

Visual layouts of PCBs for Main, AMP, Front, and Key sections, showing component placement on top and bottom views.

Section 3 Cabinet & Main Chassis

Exploded Views - Main Set Section

Detailed diagrams showing the assembly of the main unit's external and internal parts for repair and identification.

Exploded Views - Wireless Subwoofer Section

Breakdown of the wireless subwoofer's components and their physical arrangement, aiding in disassembly and reassembly.

Exploded Views - Packing Accessory Section

Illustration of all included accessories and packing materials for the product, useful for inventory and setup.

Section 4 Wireless Subwoofer Part

Woofer One Point Repair Guide

Troubleshooting guides for woofer issues like no power, errors, and wireless connection malfunctions, targeting specific components.

Woofer Waveforms of Major Check Point

Reference waveforms for voltage and PWM signals to diagnose woofer amplifier circuit issues and performance.

Woofer Wiring Diagram

Schematic detailing the wiring connections for the Woofer SMPS PCB, Woofer AMP, and Pairing Key.

Woofer Block Diagram

Functional overview of the woofer's internal systems, showing power, PWM, and wireless module interactions.

Woofer Circuit Diagrams

Detailed schematics for the Woofer SMPS, Woofer AMP, and Woofer Key circuits.

Woofer Printed Circuit Board Diagrams

Visual layouts of the Woofer SMPS, Woofer AMP, and Woofer Key PCBs, showing component placement for repair.

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