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LG BH4120SN User Manual

LG BH4120SN
103 pages
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P/NO : AFN75673460 FEBRUARY, 2012
Blu-ray
TM
/ DVD
Home Cinema System
SERVICE MANUAL
MODEL: BH4120SN
(BH4120SN, S42S2-S, S42S1-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Website http://biz.lgservice.com
Internal Use Only
MODEL: BH4120SN (BH4120SN, S42S2-S, S42S1-W)SERVICE MANUAL

Table of Contents

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LG BH4120SN Specifications

General IconGeneral
TypeHome Theater System
Speaker Configuration2.1 Channel
HDMI OutputYes
USB PlaybackYes
BluetoothYes
Number of Channels2.1
Smart FeaturesNo
Optical InputYes
FM RadioYes
SubwooferYes
Remote ControlYes
Disc PlaybackDVD, CD
Audio Formats SupportedDolby Digital, DTS
Playable Disc TypesDVD, CD
ConnectivityHDMI, USB, Optical, Bluetooth

Summary

SECTION 1 SUMMARY

PRODUCT SAFETY SERVICING GUIDELINES FOR BD-HTS PRODUCTS

Guidelines for safe servicing of BD-HTS products, covering precautions and hazards.

SERVICING PRECAUTIONS

Precautions to be taken during servicing, including general practices and handling of ES devices.

HIDDEN KEY MODE

Information on accessing hidden modes via key combinations and their respective functions.

SOFTWARE UPGRADE

Procedure for upgrading the unit's software via disc or USB.

SPECIFICATIONS

Technical specifications covering general, inputs/outputs, tuner, amplifier, system, and speakers.

SECTION 2 ELECTRICAL

DIGITAL DISPLAY & MEDIA TRAINING MASTER

Troubleshooting guide for video and display issues, including distorted pictures and no signal.

ONE POINT REPAIR GUIDE

Component-level troubleshooting and repair guides for common issues like no power or disc errors.

ELECTRICAL TROUBLESHOOTING GUIDE

Guides for troubleshooting electrical systems such as power supplies, audio, and video outputs.

WAVEFORMS

Display of signal waveforms for diagnostic purposes, covering system, video, audio, and HDMI parts.

CIRCUIT DIAGRAMS

Detailed schematic diagrams of various circuits, including SMPS, main board, and power circuits.

PRINTED CIRCUIT BOARD DIAGRAMS

Visual diagrams of the main circuit boards (SMPS, MAIN, AMP, JACK, FRONT) for identification.

SECTION 3 CABINET & MAIN CHASSIS

EXPLODED VIEWS

Visual breakdowns of the unit's cabinet and main frame sections, identifying components.

DECK MECHANISM SECTION (BM15T1.IM11)

Detailed breakdown of the disc deck mechanism, showing its components.

PACKING ACCESSORY SECTION

Lists and illustrates the included accessories and packing materials.

SPEAKER SECTION

Details on the front, center, rear speakers, and passive subwoofer.

SECTION 4 MT8560 F/E LOADER PART

ONE POINT REPAIR GUIDE

Troubleshooting specific reading errors for BD, DVD, and CD discs related to the loader part.

HOW TO USE THE SA RESET FUNCTION

Procedure for resetting SA initial values for adjustment after component changes.

MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION

Detailed block diagrams and pin functions for major ICs used in the loader part.

BLOCK DIAGRAM

High-level overview of the MT8560 loader part's components and data flow.

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