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OM7550
LG OM7550 Service Manual
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3-28
ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART
Power on.
FRONT, TOP board OK.
Check FFC cable.
Check FFC cable.
Check MAIN board.
Check SMPS board.
Replace DIG3E11.
FL+/- & VKK voltage OK?
Check MAIN board.
“HELLO”
Display on FLD
OK?
When turn
the volume, count is
change?
NO
NO
NO
NO
NO
NO
NO
CN605
cable connection
OK?
Check
CN605 pin5, 6
I2C data OK?
CN605
pin8, 9, 10 data signal
OK?
CN605
pin7, 14, 15, 16 power
OK?
YES
YES
YES
YES
YES
YES
48
50
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
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Owner's Manual
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LG OM7550 Specifications
General
Brand
LG
Model
OM7550
Category
Stereo System
Language
English
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