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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. Trouble Shooting
Main Board (Bottom side) : Power for Radio ASIC
4.14.4 Checking VCC
AB3000
TP1
TP2
2.8V OK?
No
Yes
1.8V OK?
Yes
No
Check the AB3000
Check the AB3000
Check Point
VDIGRAD_1V8
(TP2)
Common Input Power is OK
See The Next Part
Check Point
VRADA_2V8
(TP1)
AB3000
AB3000
TP1
TP2
5
7
V
2
_
K
D
D
V
8
0
4
R
0
0
9
0
4
R
5
7
V
2
_
H
D
D
V
8
V
2
_
A
D
A
R
V
2
1
4
C
u
2
.
2
8
V
1
_
D
A
R
G
I
D
V
4
1
4
C
u
1
T
A
B
V
5
8
V
2
_
G
D
D
V
9
1
4
R
0
8
V
1
_
E
D
D
V
0
3
2
4
R
5
V
1
_
D
D
D
V
5
V
2
_
F
D
D
V
4
3
4
R
0
u
1
6
3
4
C
2
1
B
1
1
A
2
1
D
2
1
F
1
1
B
2
1
C
A
_
D
D
V
O
D
L
T
X
E
D
_
D
D
V
E
_
D
D
V
C
_
D
D
V
H
_
D
D
V
5
6
V
2
_
C
D
D
V
8
V
1
_
E
D
D
V
T
A
B
V
8
V
1
_
D
A
R
G
I
D
V
8
V
2
_
A
D
A
R
V
5
7
V
2
_
H
D
D
V
5
6
V
2
_
C
D
D
V
5
V
1
_
D
D
D
V
TP1
TP2
AB3000
Содержание GD580
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