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SPD75A
LG SPD75A Service Manual
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3-3
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
AMP Block
DD
R3
256MB
HDMI
IN
eMMC
4GB
OPTICAL IN
USB 2.0
HDMI OU
T
DDR3
256MB
32
UART
S.Flas
h
1MB
SPDIF
SOC
MT8531
USB
27MHZ
27
M
H
Z
8
SPI
BT/Wi
-Fi Combo
M
odule
D+/
D-
3Color LED x
4
IR
IR -
Receiver
LCD_CLK/D0/STB
Touch/MIC PCB
TOUCH_IRQ, I2C
FRONT PCB
Touch IC
Touchcore
380
Sub MICOM
R5F100G
EAFB
3.3VA
/
48p
I2C
LED_CTRL
LCD(5Digit)
SM8Y
G
only
S
P
D
I
F
eA
RC
Sil9437
1.2/3.3V
SPDIF
RST, HPD_IN
eARC_I2C
I2S
_4c
h
INT, HPD_OUT
e_ARC+/-
(HPD_IN)
TMDS
/
DDC
WOWL/BT_RST/RST/WOBL
PDM_CL
K/DAT
CEC
AMP_MUTE
CEC
AOSDAT
A
0
AOSDAT
A
1
AOSDAT
A
2
AOSDAT
A
3
AOSDAT
A
4
CEC
SPDIF
OPT_DET
AMP_PDN, OP_MUTE,
AMP_TEMP, AMP_FAULT,
AMP_CLIP0
MT8531_RST
MICOM
3.3VA
/
100p
TMDS
/
DDC
Mic
2 EA
Touch/MIC PCB
SPH064
1LM4H-
1
(PD
M_
T
yp
e
)
ADAU
7002
I2S
_DA
T
ADAU On/Off
M_I2S_BCK/LRCK
Rear Kit
Rear
Module
RX
Rear
Module
TX (5G
)
S-Flash
1MB
SPI
Wir
ele
ss
Woofer
Wir
ele
ss
Module
RX
S-Flash
1MB
Wir
ele
ss
Module
TX (5G
)
SPI
SWF
AMP PCB
AMP (3.1.2CH)
TL
FL
LPF
LPF
C
FR
LPF
LPF
TR
LPF
AM
P
TA
S5612
AM
P
TA
S5612
AM
P
TA
S5612
24.576M
PWM
5CH
PS9860
3.3V
M_I2S_WF_BCK/LRCK
_244
M_I2S_R_BCK/LRCK_244
M_I2S_R_D_MODULE
RL
RR
M_I2S_FL/FR
M_I2S_C_SW
M_I2S_TL_TR
M_I2S_RL_
RR
Buffer
74AHC244FT
Buffer
74AHC244FT
M_I2S_BCK/LRCK_244
M_I2S_FL/FR_244
M_I2S_C_SW_244
M_I2S_TL_TR_
244
M_I2S_WF_D_M
ODULE
Adaptor
PVDD
(
25V)
I2S_BCK/
LRCK
BLOCK DIAGRAMS
1. SYSTEM BLOCK DIAGRAM
35
37
Table of Contents
Table of Contents
3
Product Safety Servicing Guidelines for Audio Products
4
Servicing Precautions
5
General Servicing Precautions
5
Insulation Checking Prodedure
5
Electrostatically Sensitive (Es) Devices
5
Name of each Component
6
Wireless Subwoofer Connection
8
Rear Speakers Connection (Sold Separately)
9
Woofer & Rear Pairing Method
10
Hidden Key Mode
11
Software Update Guide
12
Specifications
18
Disassembly Instructions
21
How to Disassemble the Main Unit
22
How to Disassemble the Subwoofer
26
Exploded Views
28
Main Unit (Sn8) Section
28
Wireless Subwoofer (Spn8-W) Section
30
Packing Accessory Section
32
Wiring Diagram
35
Block Diagrams
36
System Block Diagram
36
Power Block Diagram
37
One Point Repair Guide
38
Booting When You Turn the Unit On, no Message or "Hello" on Front Panel
38
Sound
41
Protection Error
45
Waveforms of Major Check Point
48
Crystal
48
Remote Control
49
Optical
50
Circuit Voltage Chart
52
Printed Circuit Board Diagrams
53
Main P. C. Board Diagram
53
Amp P. C. Board Diagram
54
Front Led P. C. Board Diagram
55
MIC & Touch P. C. Board Diagram
55
Wiring Diagram
57
Block Diagram
58
One Point Repair Guide
59
Power on Error
59
Wireless Connection
61
Waveforms of Major Check Point
62
Crystal
62
Flash Memory
62
Voltage
63
Amp Voltage
64
Pwm
65
Led
66
Circuit Voltage Chart
68
Printed Circuit Board Diagrams
69
Woofer Smps & Amp P. C. Board
69
Wiring Diagram
71
Block Diagram
72
One Point Repair Guide
73
Electrical Troubleshooting Guide
75
Waveforms
76
Printed Circuit Board Diagrams
78
Wireless Receiver Smps P. C. Board
78
Wireless Receiver Amp P. C. Board
79
Other manuals for LG SPD75A
Owner's Manual
64 pages
4
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LG SPD75A Specifications
General
Brand
LG
Model
SPD75A
Category
Speaker System
Language
English
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