LG KF750 Service Manual page 142
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4.16.3 Step 3
WCDMA
PAM
DC/DC
Converter
Step 3
Check VBAT (C201, C202)
in WCDMA PAM Block
Check Point (C517)
in Power Source Block
To Check Power source
Check (C517 & C201, C202)
in Block
to check inner line connection
From C517 to C201, C202
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
V
B
A
T
W
(C202,C201)
C202
C201
TP04_RF
Figure 4-7. Step 3 :WCDMA PAM Block
3.7V
OK?
See the Next Page
,
Soldering Check Component
In Power Source Block
- 143 -
4. TROUBLE SHOOTING
TP04_RF
(C202, C201)
C
2
0
1
C
2
0
2
1
0
u
0
0 .
1
u
W
P
A
_
V
C
C
C
2
0
8
D
I N
D
C
D
C
_
E
N
No
Yes
No
3.7V
OK?
Yes
No
Short ?
Yes
(CN500)
U
2
0
1
L
M
3
2
0
8
T
L
B
1
V
D
D
S
W
A
1
P
V
N I
F
B
C
2
V
C
O
N
S
G
N
D
C
1
E
N
P
G
N
D
Check the PowerSupply
Change Board
LGE Internal Use Only
A
2
C
3
B
3
A
3
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Troubleshooting
