LG SPH4B-W Service Manual

3-27
Copyright © 2021 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
3. TACT KEY
FIG 3-2. Press Function Key
0.72 ~ 0.82 V
FIG 3-1. Press Power Key
1 ~ 1.13 V
6
6
FIG 3-3. Press VOL- Key FIG 3-4. Press VOL+ Key
0.424 ~ 0.485 V
0 V
6 6
6
VD33ADAC
C526 10uF
R521
4.7K
R553
100
R567
0NC
R588
10K
C564
1nF
R530
0
R519 47K
KEY
AMP_CLIP0
IC501
84
RESET_B
85
SPI_CS2
86
SPI_CS3
87
SPI_CLK
88
SPI_DI
89
SPI_DO
90
SPI_WP
91
SPI_HOLD
92
SPDIF_OUT
93
SYS_ADC_A
94
SYS_ADC_B
95
SYS_ADC_C
96
SYS_ADC_D
97
PWM_VREF
98
VD33ADAC
99
VS33ADAC
DGND
VD33
3.3VA
DC_PROTECTION
R520
4.7K
R554
100
DGND
RA01
680
RA03
1K
RA02
820
RA00
CA00
100nF
SWA00
1
2
3
4
SWA01
1
2
3
4
SWA02
1
2
3 4
SWA03
1
2
3
4
SWA04
1
2
3
4
RA04
RA05
750
RA06
820
POWER
FUNC.VOL+ VOL-
WIFI

LG SPH4B-W Specifications

General

Brand	LG
Model	SPH4B-W
Category	Speaker System
Language	English