Only For Training And Service Purposes - LG GM200 Service Manual
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- User manual (48 pages) ,
- User manual (74 pages) ,
- User manual (66 pages)
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(3) Checking TX I/Q
TEST POINT
TP3
TP4
Figure 4.3.4
WAVEFORM
CHECKING FLOW
Check C516, C517.
Check if there is any
Major difference
Refer to Graph 4.3.4
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP2
TP1
TP3 & TP4
TX_I
TX_Q
TP1 & TP2
Similar?
Yes
Redownload software and calibration
2
2
0
n
C
5
1
4
1
u
V
C
C
1
7
V
A
F
1
8
R
E
F
1
9
R
E
F
2
0
R
E
F
2
1
Q
N
Q
B
2
2
C
5
1
6
Q
2
3
3
9
p
V
C
C
2
4
Q
P
V
L
D
O
1
Graph 4.3.4
No
No
Replace U501
again
- 81 -
4. TROUBLE SHOOTING
CIRCUIT
V
L
D
O
1
TP3
_
R
E
F
N
C
8
C
_
N
C
S
E
N
7
N I
B
S
C
L
K
U
5
0
1
6
N I
S
D
A
T
A
5
E
U
S
Y
0
2
8
0
1
0
1
_
O
P
V
C
C
_
B
I B
4
B I
A
D
6
5
4
8
3
I
2
_
B
B
Q
V
C
C
_
F
E
1
LGE Internal Use Only
TP4
N I
C
5
1
7
3
9
p
P I
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