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Portable Stereo System
SB74
Service manual
Circuit Voltage Chart - LG SB74 Service Manual
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CIRCUIT VOLTAGE CHART
Pin No.
Pin No.
Voltage
U501
27
28
1
2.29
2
2.3
29
3
2.59
30
31
4
0.68
5
GND
32
33
6
3.3
7
3.3
34
8
2.99
35
36
9
3.23
10--14
NC
37
38
15
1.67
16
1.67
39
17
NC
40
41
18
NC
19--22
1.67
42
43
23
NC
24
NC
44
25--31
1.66
45
46
32--35
NC
36--48
1.66
47
48
51
1.66
49
NC
49
50
50
NC
IC603
52-61
1.66
62
NC
1
2
63
NC
64
NC
3
4
IC600
1
1.25
5
2
GND
6
7
3
2.35
4
0.09
8
9
5
3.31
6
1.96
10
IC601
11
12
1
3.25
2
2.12
13
14
3
2.12
4
DGND
15
5
2.12
16
17
6
2.12
7
3.25
18
19
8
2.12
9
2.12
20
10
DGND
21
22
11
2.15
12
2.15
23
24
13
3.25
14
0.9
25
15
1.53
26
27
16
2.93
17
3.09
28
29
18
0.9
19
0.9
30
20
0.9
31P
(32-46)
21
0.9
22
0.9
47
48
23
0.9
24
0.9
49
25
3.25
50
51
26
DGND
Voltage
Pin No.
Voltage
0.9
52
DGND
0.9
53
1.53
0.9
54
1.53
0.9
55
2.93
0.9
56
2.93
0.9
57
2.93
NC
58
3.25
0.9
59
3.25
1.53
60-62
3.25
0.9
63
1.36
NC
64
2.12
3.25
65
2.68
2.12
66
0.01
2.12
67
1.31
DGND
68
0.01
2.15
69
3.18
2.15
70
0.28
3.25
71
3.21
2.15
72
0.47
2.15
73
3.21
DGND
74
3.24
2.15
75
3.25
2.15
76
3.25
DGND
77
3.3
78
2.12
3.25
79
0.01
3.25
80
0.02
AGND
81
3.16
3.25
82
2.76
3.2
83
1.64
2.12
84
3.25
2.12
85
DGND
2.12
86
1.65
2.12
87
0.77
2.12
88
1.06
2.12
89
1.59
2.12
90
3.2
1.2
91
1.24
AGND
92
1.24
0.38
93
2.14
3.1
94
1.3
0.38
95
DGND
2.15
96
2.1
2.15
97
1.8
2.15
98
1.33
2.15
99
0.08
2.15
100
1.61
2.15
101
1.6
2.15
102
1.67
2.15
103
0.05
2.15
104
9.4mV
2.15
105
3.25
0.89
106
9.4mV
0.89
107
3.26
3.25
108
0.05
DGND
109
DGND
0.9
110
DGND
1.2
111
1.55
DGND
112
1.35
3.02
113
3.3
3.09
114
DGND
3.25
115
3.3
3-27
Pin No.
Voltage
Pin No.
Voltage
116
0.06
15
7.75
117
3.08
U301A
118
DGND
1
GND
119
DGND
2
11.45
120
1.20V
3
3.96
121
DGND
U302
122
1.20V
1
GND
123
DGND
2
3.3
124
1.2
3
5.43
125
1.85
U503
126
0.3
1
4.17
127
1.5
2
4.17
128
3.24
3
4.17
IC604
4
4.17
1
0.02
5
4.17
2
0.02
6
4.17
3
0.05
7
4.17
4
DGND
8
4.17
5
3.3
9
4.17
6
0.03
10
4.17
7
DGND
11
4.17
8
3.28
12
4.17
9
DGND
13
4.17
10
0.04
14
4.17
11
GND
15
4.18
12
0.06
16
4.2
13
3.25
17
4.2
14
AGND
18
4.17
15
0.19
19
4.18
16
0.19
20
4.17
17
0.04
21
4.17
18
0.19
22
4.17
19
0.19
23
4.17
20
0.04
24
8.36
IC605
25
3.21
1
GND
26
3.21
2
3.31
27
GND
3
1.2
28
4.19
IC654
U701
1
3.25
1
GND
2
0.01
2
1.37
3
2.12
3
1.49
4
DGND
4
GND
5
1.31
5
1.32
6
2.68
6
1.65
7
2.12
7
3.34
8
3.25
8
NC
U200
9
NC
1
7.74
10
3.32
2
7.75
11
3.29
3
15.52
12
NC
4
1.49
13
NC
5
NC
14
3.32
6
7.78
15
3.3
7
7.45
16
3.25
8
GND
17
3.18
9
GND
18
3.56
10
NC
19
NC
11
NC
20
3.21
12
1.48
21
3.21
13
15.52
22
3.34
14
7.74
23
GND
3-28
Pin No.
Voltage
Pin No.
Voltage
24
NC
57
1.65
25
NC
58
3.28
26
3.34
59
DGND
27
3.34
60
0.73
28
3.34
61
1.65
U703
62
1.65
1
3.3
63
1.65
2
1.65
64
1.95
3
1.65
U704
4
1.65
1
3.56
5
AGND
2
3.52
6
1.65
3
3.54
7
1.65
4
3.53
8
0.01
5
1.64
9
3.02
6
1.64
10
1.65
7
7.74
11
1.65
8
7.74
12
1.65
9
7.74
13
1.65
10
7.16
14
1.65
11
3.31
15
1.65
12
16
1.65
13
17
3.3
14
18
3.19
15
19
0.12
16
20
3.19
17
21
3.3
18
GND
22
3.3
19
3.56
23
0.12
20
3.56
24
3.27
21
3.56
25
1.65
22
3.56
26
1.81
23
1.65
27
DGND
24
1.65
28
1.65
25
7.66
29
3.19
26
1.65
30
3.16
27
GND
31
NC
28
GND
32
DGND
29
3.01
33
3.29
30
3.25
34
1.65
31
35
1.68
32
36
1.61
33
3.25-6.01
37
1.81
34
3.25-6.01
38
1.42
35
GND
39
1.62
36
40
1.3
41
1.65
42
DGND
43
DGND
44
1.65
45
1.65
46
0.32
47
3.28
48
1.23
49
1.3
50
DGND
51
DGND
52
NC
53
3.28
54
AGND
55
1.65
56
1.65
NC
NC
NC
NC
NC
NC
0
NC
NC
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