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NS9550F
LG NS9550F Service Manual
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3-31
ELECTRICAL TROUBLESHOOTING GUIDE
USB play
Replace IC300.
NO
IC300
USB power +5 VU
OK?
YES
A
A
When insert USB,
IC501 PinU7, U8, A7, A8 USB_D
signal OK?
NO
YES
YES
YES
YES
AUX
Check audio cable.
Replace IC202.
Check IC501.
NO
NO
NO
IC202
Pin7, 8 AUX input signal
OK?
IC202 Pin41
ADC/MIC_data output signal
OK?
IC202
Pin42, 43, 44 I2S input signal
OK?
51
53
Table of Contents
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Hidden Key Mode
7
Service Information for Eeprom
8
Program Download & Update Guide
9
Specifications
13
Exploded Views
16
Cabinet and Main Frame Section (Cm9550)
16
Mechanism Deck Section (Dp17Tm2)
17
Packing Accessory Section
18
Speaker Section
19
One Point Repair Guide
23
Power
23
Booting When Power on the Set
25
Vfd Is Not Displayed When Power on the Set
26
Booting in CD/Usb Function
28
Operation of MD (Driving the Servo Motors)
33
Sound
38
Audio Output Is Small or no Audio Output
43
Power on (Standby Led Is Blinking)
44
Speaker no Audio
45
Electrical Troubleshooting Guide
46
Power Supply on Smps Board
46
System Part
50
Audio Part
51
Lighting (Woofer Speaker)
56
Waveforms of Major Check Point
57
Wiring Diagram
62
Block Diagrams
63
Smps Block Diagram
63
Main System Block Diagram
64
Main Power Block Diagram
65
Circuit Diagrams
66
Smps - Power #1 Circuit Diagram
66
Smps - Power #2 Circuit Diagram
67
Main - CD Dsp Circuit Diagram
68
Main - Rf / Servo Circuit Diagram
69
Main - Adc / Pwm Circuit Diagram
70
Main - Amp Circuit Diagram
71
Front Volume Circuit Diagram
72
MIC & Portable Circuit Diagram
73
Front Speaker Main Circuit Diagram
74
Front Speaker Sub Circuit Diagram
75
Woofer Speaker Main Circuit Diagram
76
Woofer Speaker Sub Circuit Diagram
77
Circuit Voltage Chart
78
Connectors
78
Capacitors
78
Printed Circuit Board Diagrams
79
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
Other manuals for LG NS9550F
Owner's Manual
43 pages
Simple Manual
4 pages
4
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LG NS9550F Specifications
General
Brand
LG
Model
NS9550F
Category
Stereo System
Language
English
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