LG B2050 Service Manual - Page 74
Change the SIM Card. Our Phone
 |
View all LG B2050 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 74 highlights
Checking Flow 4 . TROUBLE SHOOTING START Does the SIM cards supports 3V? NO Change the SIM Card. Our Phone supports only 3V SIM card YES NO Voltage at pin1 of J300 is 3V? YES Voltage at VSIM of U101 Is 3V? NO YES Replace J300 or check soldering of components NO Change the SIM Card And try again. Does it work Properly? Redownload SW. Does it work Properly? NO Change the main board YES Change SIM Card YES SIM Card will be detected - 73 -
-
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
 |
 |
- 73 -
4 . TROUBLE SHOOTING
Checking Flow
START
Does the SIM cards
supports 3V?
Voltage at pin1 of
J300 is 3V?
Change the SIM Card
And try again.
Does it work
Properly?
Change the SIM Card. Our Phone
supports only 3V SIM card
Voltage
at VSIM of U101
Is 3V?
Redownload SW.
Does it work
Properly?
Replace J300 or check
soldering of components
Change the main board
Change SIM Card
SIM Card will be detected
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES