LG NS9550F Service Manual

85 pages

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3-35

ELECTRICAL TROUBLESHOOTING GUIDE

4. NO LIGHTING (WOOFER SPEAKER)

YES

CD / USB play

Check IC501.

Check woofer speaker.

Check SMPS board.

CNWM02,

CNWS01 Pin3, 4 I2C signal

OK?

Pin1 +12 V OK?

Table of Contents3
Servicing Precautions4
Esd Precautions6
Hidden Key Mode7
Service Information for Eeprom8
Program Download & Update Guide9
Specifications13
Exploded Views16
Cabinet and Main Frame Section (Cm9550)16
Mechanism Deck Section (Dp17Tm2)17
Packing Accessory Section18
Speaker Section19
One Point Repair Guide23
Power23
Booting When Power on the Set25
Vfd Is Not Displayed When Power on the Set26
Booting in CD/Usb Function28
Operation of MD (Driving the Servo Motors)33
Sound38
Audio Output Is Small or no Audio Output43
Power on (Standby Led Is Blinking)44
Speaker no Audio45
Electrical Troubleshooting Guide46
Power Supply on Smps Board46
System Part50
Audio Part51
Lighting (Woofer Speaker)56
Waveforms of Major Check Point57
Wiring Diagram62
Block Diagrams63
Smps Block Diagram63
Main System Block Diagram64
Main Power Block Diagram65
Circuit Diagrams66
Smps - Power #1 Circuit Diagram66
Smps - Power #2 Circuit Diagram67
Main - CD Dsp Circuit Diagram68
Main - Rf / Servo Circuit Diagram69
Main - Adc / Pwm Circuit Diagram70
Main - Amp Circuit Diagram71
Front Volume Circuit Diagram72
MIC & Portable Circuit Diagram73
Front Speaker Main Circuit Diagram74
Front Speaker Sub Circuit Diagram75
Woofer Speaker Main Circuit Diagram76
Woofer Speaker Sub Circuit Diagram77
Circuit Voltage Chart78
Connectors78
Capacitors78
Printed Circuit Board Diagrams79
Smps P.C.board (Top View)79
Smps P.C.board (Bottom View)80
Main P.C.board (Top View)81
Main P.C.board (Bottom View)82
Front Volume & MIC & Portable P.C.board (Top View)83
Front Volume & MIC & Portable P.C.board (Bottom View)84
Front Speaker Main/Sub & Woofer Speaker Main/Sub P.C.board (Top View)85
Front Speaker Main/Sub & Woofer Speaker Main/Sub P.C.board (Bottom View)85

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LG NS9550F Specifications

General

Brand	LG
Model	NS9550F
Category	Stereo System
Language	English

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