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MCV903 Series
LG MCV903 Series Service Manual
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3-12
Copyright ©
2008 LG Electronics
.
Inc.
All right reserved.
Only for tr
aining and ser
vice purposes
LGE Internal Use Only
NO
IC603
→
PS9830
communication chec
k
9 PIN SO
T
O
→
33PIN SDIN
10PIN LRCK
→
32LRCK
11PIN MCLK
→
30MCLK
13PIN BCK
→
31BCK
Check the IC603
input power
.
Replace the related
par
t
Check each comm
unication
line resistance
Ref
er to PS9830
T
roubleshooting
NO
NO
IC100 38PIN
→
IC603 Check the REST
operation
Check the
pow
er at both ter
minals
of FB803
YES
YES
YES
YES
YES
NO
Check the
PS9830 input
Check CN701
9PIN 5V
YES
OK
YES
YES
OK
OK
13.
PWM MODULA
TION P
ART CHECK I
PWM MODULA
TION
P
ART CHECK I
Ref
er to SMPS
T
roubleshooting.
Check CN701
9PIN 5V
YES
Check IC505
input 5V and
output 3.3V
NO
NO
Check
IC505 input power
5V
NO
YES
YES
32
34
Table of Contents
Section 1. General
3
Servicing Precautions
3
Notes Regarding Handling of the Pick-Up
3
Notes Regarding Compact Disc Player Repairs
4
Esd Precautions
5
Location of Users Controls
6
Front / Back Panel
6
Remote Control
7
Specifications
8
Section 2. Exploded Views
12
Cabinet and Main Frame Section
12
Tape Deck Mechanism Exploded View
13
Tape Deck Mechanism (A/R & A/S : Right A/R Deck)
13
CD Mechanism Exploded View
15
Speaker Exploded View
16
Packing Accessory View
20
Optional Parts
20
Section 3. Audio Electrical Part
22
Micom Part Check I
22
Fld Display Check
25
Troubleshooting
25
Tape Play Part Check
30
Tape Rec Part Check
31
Pwm Modulation Part Check
35
Power Amp Part Check
38
INTERNAL BLOCK DIAGRAM of Ics
40
Pin Configuration
41
System Block Diagram
45
Functional Block Diagram
46
Wiring Diagram
50
Main & Front Block Diagram
51
Smps Schematic Diagram
53
Interface Schematic Diagram
56
Deck Schematic Diagram
57
Woofer Amp Schematic Diagram
59
Front Schematic Diagram
60
Printed Circuit Board Diagrams
65
Smps P.C. Board Diagram
65
Front P.C. Board Diagram
70
Section 4. CD Electrical Part
74
Usb Function
75
Waveforms of Major Check Point
76
Audio Path
76
Dsp Schematic Diagram
78
Rf Servo Schematic Diagram
79
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LG MCV903 Series Specifications
General
Brand
LG
Model
MCV903 Series
Category
Stereo System
Language
English
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