LG B2050 Service Manual - Page 66
SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu
 |
View all LG B2050 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 66 highlights
4 . TROUBLE SHOOTING Checking Flow SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu START NO Is the voltage at pin 3 of U401 high? YES NO Is the voltage at pin 1 of U401 high? YES NO Is the voltage at pin 5 of U401 high? YES Replace vrbrator YES Vibrator working Check the soldering of R315, R399 YES NO Resolder R315, R399 Check the soldering of C300 YES Replace U401 NO Resolder C300 Check the soldering of C300 YES Replace U401 NO Resolder C300 - 65 -
-
1 -
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
-
20
-
21
-
22
-
23
-
24
-
25
-
26
-
27
-
28
-
29
-
30
-
31
-
32
-
33
-
34
-
35
-
36
-
37
-
38
-
39
-
40
-
41
-
42
-
43
-
44
-
45
-
46
-
47
-
48
-
49
-
50
-
51
-
52
-
53
-
54
-
55
-
56
-
57
-
58
-
59
-
60
-
61 -
62 -
63 -
64 -
65 -
66 -
67 -
68 -
69 -
70 -
71 -
72
-
73
-
74
-
75
-
76
-
77
-
78
-
79
-
80
-
81
-
82
-
83
-
84
-
85
-
86
-
87
-
88
-
89
-
90
-
91
-
92
-
93
-
94
-
95
-
96
-
97
-
98
-
99
-
100
-
101
-
102
-
103
-
104
-
105
-
106
-
107
-
108
-
109
-
110
-
111
-
112
-
113
-
114
-
115
-
116
-
117
-
118
-
119
-
120
-
121
-
122
-
123
-
124
-
125
-
126
-
127
-
128
-
129
-
130
-
131
-
132
-
133
 |
 |
- 65 -
4 . TROUBLE SHOOTING
Checking Flow
SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu
START
Is the voltage at pin 3
of U401 high?
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
Check the soldering
of R315, R399
Check the soldering
of C300
Check the soldering
of C300
Replace U401
Replace U401
Replace vrbrator
Vibrator
working
Resolder R315, R399
Resolder C300
Resolder C300
Is the voltage at pin 1
of U401 high?
Is the voltage at pin 5
of U401 high?