LG KF750 Service Manual page 141

4. TROUBLE SHOOTING
4.16.2 Step 2
GSM PAM
Figure 4-4. Step 2 : GSM PAM Block
Step 2
Check VBATT (C102, C103)
in GSM PAM Block
to Check if main power
source input or not
Check Point (C517)
in Power Source Block
To Check Power source
Check (C517 & C102,C103)
in Block
to check inner line connection
From C517 to C102, C103
LGE Internal Use Only
TP03_RF
(C102,C103)
C102
C103
No
3.7V
OK?
Yes
Proceed to the Step 3
3.7V OK?
Yes
Short?
Yes
Soldering Check Component
(CN500)
In Power Source Block
- 142 -
TP03_RF
(C102,C103)
C 1 0 0 C
2 2 p 1 0
G N D 6 P G N D
1 5 2 9
G N D 7
1 6
G N D 8 G N D 5
1 7 1 4
G N D 9 G N D 4
1 8 1 3
G N D 1 0 G N D 3
1 9 1 2
G N D 1 1 G N D 2
2 0 1 1
G N D 1 2 G N D 1
2 2 9
G N D 1 3
2 4
W C D M A 1
1 0
D C S _ P C S _ N I R X 1
2 1 7
R X 2
6
G S M _ N I R X 3
2 3 5
R X 4
4
V A P C
2 5
R S V D
3
V B A T T M O D E
2 6 2
T X E N
1
B S 2
C 1 0 7 2 2 p
2 7
B S 1 A N T
2 8 8
S K Y 7 7 5 1 9 U 1 0 0
No
Check The PowerSupply
No
Change Board
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
V B A T
1 0 1 C 1 0 2 C 1 0 3
n 1 0 u 1 0 u
W R F _ B A N D _ 1
R X 8 5 0
R X 9 0 0
R X 1 9 0 0
R X 1 8 0 0
D I N
C 1 0 8
S W 1 0 0
K M S 5 - 1 8