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LG FA162 Service Manual

LG FA162
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3-9
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART
4. PWM MODULATION PART
PWM modulation
part check
Refer to
SMPS troubleshooting.
Check IC602 TAS5548 VDD
power(pin9, 14, 35, 50).
Replace the related part.
Check resitance output of line
DATA: R610, CLK: R611.
Check the related part of X600.
Replace the related part.
Check IC602 TAS5548.
OK
Replace the related part.
Replace the related part.
Check
IC104 Pin3: 3.3V
If it is YES, then OK. If it is NO, then check
IC104 Pin2: 3.7VA --> IF it is NO, refer to
SMPS troubleshooting.
Check
if X600 12.288 MHz is
working.
NO
NO
NO
NO
Check
IC602 TAS5548 Pin11 CLK
input.
Check output
of IC101 LC87FC096AVU
Pin32: PWM_CLK, Pin31: PWM_DATA
Pin19: PWM_RESET
Check
IC602 TAS5548 input
Pin20 -> DATA, Pin21 -> CLK
Pin16 -> RESET
Check PWM
modulator output FL49(+) 48(-),
FR47(+) 46(-).
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES

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Questions and Answers:

LG FA162 Specifications

General IconGeneral
KaraokeNo
Speaker type-
RMS rated power160 W
Number of speakers2
EqualizerYes
Tuner typeDigital
Supported radio bandsAM, FM
Preset stations quantity50
TypeHome audio micro system
Product colorBlack
Playback disc formatsCD audio
Audio formats supportedMP3, WMA
USB 2.0 ports quantity1
Apple docking compatibilityNot supported
Power sourceAC

Summary

Section 1 Summary

Servicing Precautions

Guidelines for safely handling and repairing unit components, including pick-up handling.

ESD Precautions

Detailed techniques to prevent damage to electronic components from static electricity.

Hidden Key Mode

Explains special functions accessed via specific button combinations on the unit.

Service Information for EEPROM

Instructions and flowcharts for EEPROM programming and option editing.

Program Download Guide

Procedures for downloading and updating firmware for the unit via USB.

Specifications

Lists the technical specifications for the Micro Hi-Fi System.

Section 2 Cabinet & Main Chassis

Cabinet and Main Frame Section (FA162N)

Exploded view detailing the main unit's cabinet and internal frame components.

Deck Mechanism Section (DP-12AM)

Exploded view illustrating the components of the CD deck mechanism.

Packing Accessory Section

Visual guide to all accessories included with the product and their packaging.

Speaker Section (FAS162F)

Exploded view and details specific to the speaker system components.

Section 3 Electrical

Tone Point Repair Guide

Troubleshooting common power and audio output issues with specific repair steps.

Electrical Troubleshooting Guide of Audio Part

Systematic troubleshooting steps for various audio subsystem problems.

Electrical Troubleshooting Guide of CD Part

Systematic troubleshooting steps for common CD playback errors.

Waveforms of Major Check Point

Illustrates critical signal waveforms for diagnosing circuit operation.

Wiring Diagram

Diagram showing internal harness and FFC connections between unit modules.

Block Diagrams

High-level overview of the system's architecture and component interactions.

Circuit Diagrams

Detailed schematic diagrams for the SMPS, Main, AMP, and other circuit sections.

Circuit Voltage Chart

Table listing expected voltage readings for key ICs and components.

Printed Circuit Board Diagrams

Top and bottom views of the SMPS, Main, Front, and Touch PC boards.

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