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OM7550
LG OM7550 Service Manual
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3-41
3-42
IC501
MLC3730
IC401
RF IC
BU9546
IC202
PWM
PS9860
IC101
MICOM
R5F100G
IC201
ADC
CS5346
IC206
ADC
PCM1808
IC503
F/S 16M
W25Q128
IC502
SDRAM
W9825G
IC2604
MIC AMP
DRV632
IC400
Motor DR
AM5890
IC603
EXPENDER
BU2090F
IC604
DRV632
IC700
GATE DRI
VE
IRS2092
IC701
GATE DRI
VE
IRS2092
IC705
GATE DRI
VE
IRS2092
Q705/Q706
IRF6775M
Q707/Q708
IRF6775M
Q717/Q718
IRF6775M
IC602
DAC
PCM5101
Tuner
MIC
MIC
PTB
33pin
33pin
12pin
10pin
12pin
10pin
10pin
10pin
23pin
23pin
10pin
USB1
USB2
10pin
10pin
VFD Board
To
p
B
o
a
r
d
MAIN Bo
ard
Front Board
10pin
10pin
BT
module
AUX
IN/OUT
SPK
LED
SPK
Fron
t
SPK
Woofer
IC204
S4308
IC205
S4308
MD
15pin
6p
i
n
15pin
6p
i
n
SMPS
MIC
VOL
Harness
FFC
6p
i
n
6p
i
n
WIRING DIAGRAM
61
63
Table of Contents
Section 1 Summary
3
Default Chapter
3
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Hidden Key Mode
7
Service Information for Eeprom
8
1 Audio Program
9
Program Download & Update Guide
9
400 CD Program
10
3 Eq Program
11
Specifications
12
Section 2 Cabinet & Main Chassis
14
Disassembly Instructions
15
How to Disassemble the Side Cover (Left & Right)
15
Exploded Views
18
Cabinet and Main Frame Section
18
Deck Mechanism Section (Dm19)
19
Packing Accessory Section
20
Section 3 Electrical
22
One Point Repair Guide
23
Power
23
Amp Power
24
Booting When Power on the Set
25
Vfd Is Not Displayed When Power on the Set
26
Audio Output Is Small or no Audio Output
27
Power on (Standby Led Is Blinking)
28
Speaker no Audio
29
Booting in CD/Usb Function
31
Operation of MD
36
Sound
41
Electrical Troubleshooting Guide
46
Power Supply on Smps Board
46
System Part
49
Audio Check
50
Lighting (Speaker Led)
55
Waveforms of Major Check Point
56
Dsp (Ic501)
56
Pwm (Ic202)
57
Servo (Ic401)
58
Motor Driver (Ic400)
59
Adc (Ic201)
60
Bluetooth (Cn504)
61
Wiring Diagram
62
Block Diagrams
63
System Block Diagram
63
Power Block Diagram
64
Circuit Diagrams
65
Smps_Power #1 Circuit Diagram
65
Smps_Power #2 Circuit Diagram
66
Main_Cd Dsp Circuit Diagram
67
Main_Adc/Pwm Circuit Diagram
68
Main_Rf Servo Circuit Diagram
69
Main_Amp Circuit Diagram
70
Main_Aux Out/ Vfd Pwr Circuit Diagram
71
Front Circuit Diagram
72
Vfd/Rmc1 Circuit Diagram
73
Top Circuit Diagram
74
Circuit Voltage Chart
75
Ics
75
Capacitors
75
Connectors
76
Zener Diodes
76
Printed Circuit Board Diagrams
77
Smps P. C. Board (Top View)
77
Smps P. C. Board (Bottom View)
78
Main, Vfd/Rmc1 P.C.board (Top View)
79
Main, Vfd/Rmc1 P.C.board (Bottom View)
80
Front P.C.board (Top View)
81
Front P.C.board (Bottom View)
81
Top(Volume_Fr1) P.C.board (Top View)
82
Top(Volume_Fr1) P.C.board (Bottom View)
83
Appendix Mechanism (Dm19Aa)
84
Appendix
85
Clamp Assembly
85
Plate
85
Magnet
85
Clamp
85
Cover Top
85
Tray Disc
86
Base Up/Down
87
Pick up Assembly
87
Belt Loading
88
Deck PCB Assembly
88
FFC Cable
88
Gear Loading
88
Gear Pulley
88
Guide
88
Motor Assembly
88
Deck Mechanism Disassembly
85
Deck Mechanism Exploded View (Dm19Aa)
89
Other manuals for LG OM7550
Owner's Manual
44 pages
5
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LG OM7550 Specifications
General
Brand
LG
Model
OM7550
Category
Stereo System
Language
English
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