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4. TROUBLE SHOOTING
(3) Checking RX I/Q
TEST POINT
C541
Waveform
Checking Flow
LGE Internal Use Only
C519
U503
Figure 4.2.3
Graph 4.2.3
Check C519, C541.
Check if there is any
Major difference
Refer to graph 4.2.3
Yes
Redownload software and calibration
CIRCUIT
C521
0.1u
25
RX1900B
26
RX1900
27
RX1800B
28
RX1800
29
RX900B
30
RX900
31
RX850B
32
RX850
33
GND
No
No
Similar?
Replace U503
again
Copyright © 2007 LG Electronics. Inc. All right reserved.
- 44 -
QP
C519
39p
QN
16
VLDO2
15
VLDO1
14
VBAT
AD6548
13
VDD
U503
12
VCC_TXVCO
11
TXOP_HI
10
TXOP_LO
9
VLDO3
IP
C541
39p
IN
Only for training and service purposes
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