LG B2050 Service Manual - Page 61
Power On Trouble
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4 . TROUBLE SHOOTING 4.3 Power On Trouble TEST POINT 1V8_VCORE 2V8_VMEM 1V8_VRTC 2V85_VSIM 2V75_VABB 2V5_VMIC 2V75_VVCXO 2V8_VEXT BAT100 CIRCUIT VCORE1 VCORE2 VMEM1 VMEM2 VRTC VSIM VABB VMIC VVCXO NC_E15 VEXT1 VEXT2 VBAT_NET NC_E16 NC_F16 P1 N1 T3 T2 T7 T6 H16 N16 D16 E15 A4 B4 T4 E16 F16 VBAT R104 1u C112 C113 1u C114 1u C115 C116 C117 C118 C119 1u 1u 2.2u (1608) 1u 1u C122 1u 10K C149 27p - 60 -
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- 60 -
TEST
POINT
CIRCUIT
)
8
0
6
1
(
1V8_VCORE
u
1
6
1
1
C
u
1
5
1
1
C
2V75_VVCXO
u
1
2
2
1
C
BAT100
u
1
9
1
1
C
2V8_VEXT
2V75_VABB
2V85_VSIM
u
1
4
1
1
C
T
A
B
V
u
2
.
2
7
1
1
C
u
1
2
1
1
C
2V5_VMIC
p
7
2
1V8_VRTC
u
1
9
4
1
C
8
1
1
C
K
0
1
4
0
1
R
2V8_VMEM
u
1
3
1
1
C
1
P
1
E
R
O
C
V
1
N
2
E
R
O
C
V
4
A
1
T
X
E
V
4
B
2
T
X
E
V
3
T
1
M
E
M
V
2
M
E
M
V
2
T
C
I
M
V
6
1
N
7
T
C
T
R
V
M
I
S
V
6
T
6
1
D
O
X
C
V
V
6
1
H
B
B
A
V
T
E
N
_
T
A
B
V
4
T
5
1
E
_
C
N
5
1
E
6
1
E
6
1
E
_
C
N
6
1
F
_
C
N
6
1
F
4.3 Power On Trouble
4 . TROUBLE SHOOTING