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SPJ4B-W
LG SPJ4B-W Service Manual
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3-3
Copyright © 2017 - 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
DSP
MAIN/AMP PC
B
Micom
27 MHz
MTK_RST/TX/RX
DDR3
DCDCs
P_CTRL
Optical In
Wireless
Module 1, 2
Serial
Flash
Serial
Flash
SPI
WL_MUT
/
RST/INT/MSG_RDY
/I2C
SPI
USB
(Playback)
HDMI IN
HDMI OUT
BT_SPD
IF
KEY
FL 40
W
AMP
TL 20
W
PWM_RST
MUTE
I2C_D
AT
I2C_C
LK
M_BCK/LRCK/
DATA0,1,2
FR P,N /
TWR P,N
PWM_DATA2/
LRCK/BCK
Potable in
Analog_L
/R
ADC
PTB_DET
PWM IC
AMP
FL 40
W
LPF
TL 20
W
FL P,N /
TWL
P,N
Key PCB
Serial Flash
SPI
Adapter
25 V
Wireless
Active Woofer
200 W
Rear SPK
120 W
Front PCB
Dot LED
(5ea)
IR-Receiver
BT_UART
SPDIF
USB1+/
-
TMDS/HPD/I2
C/ARC/C
EC
TMDS/
RX_HPD/I
2C
/PWR5V/C
EC
BT_RESET/STA
NBY
EMERGENC
Y/WAKE
I2C/HP
D/CEC/EDI
D_SW
BLOCK DIAGRAMS
1. SYSTEM BLOCK DIAGRAM
33
35
Table of Contents
Section 1 General
3
Table of Contents
3
Esd Precautions
4
Name of each Component
5
Wireless Subwoofer Connection
6
Rear Speakers Connection (Sold Separately)
7
About Led Condition
8
Hidden Key Mode
9
Software Update Guide
10
Specifications
16
Section 2 Cabinet & Main Chassis
18
Disassembly Instructions
19
How to Disassemble the Main Unit
20
How to Disassemble the Woofer
26
Exploded Views
28
Main Unit Section
28
Wireless Subwoofer Section
29
Packing Accessory Section
30
Section 3 Electrical
32
Wiring Diagram
33
Block Diagrams
34
System Block Diagram
34
Power Block Diagram
35
One Point Repair Guide
36
Set Doesn't Booting When You Turn on the Set
36
Sound
39
Protection Error
44
Waveforms of Major Check Point
47
Crystal
47
Flash Memory
47
Tact Key
48
Usb
49
Remote Control
50
Optical
51
Portable
52
Circuit Voltage Chart
54
IC Voltage
54
Capacitor Voltage
54
Connector Voltage
54
Printed Circuit Board Diagrams
55
Main P. C. Board Diagram
55
Front P. C. Board Diagram
56
Key P. C. Board Diagram
56
Section 4 Wireless Subwoofer Part
58
Wiring Diagram
59
Block Diagram
60
One Point Repair Guide
61
Power on Error
61
Wireless Connection
63
Waveforms of Major Check Point
64
Crystal
64
Flash Memory
64
Voltage
65
Amp Voltage
66
Pwm
67
Led
68
Circuit Voltage Chart
70
Printed Circuit Board Diagrams
71
Woofer Smps & Amp P. C. Board
71
Section 5 Wireless Receiver Part (Option)
72
Wiring Diagram
73
Block Diagram
74
One Point Repair Guide
75
Electrical Troubleshooting Guide
77
Waveforms
78
Printed Circuit Board Diagrams
80
Wireless Receiver Smps P. C. Board
80
Wireless Receiver Amp P. C. Board
81
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LG SPJ4B-W Specifications
General
Brand
LG
Model
SPJ4B-W
Category
Speaker System
Language
English
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