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(3) Checking RX I/Q
TEST POINT
U502
C507
Figure 4.2.3
WAVEFORM
CHECKING FLOW
Check C507, C530.
Check if there is any
Major difference
Refer to graph 4.2.3
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C530
C514
0.1u
C525
27p
Graph 4.2.3
Similar?
Yes
Redownload software and calibration
- 45 -
4. TROUBLE SHOOTING
CIRCUIT
QP
C507
DNI
QN
2V75_VVCXO
C513
0.1u
RX1900B
25
RX1900
VLDO2
26
16
RX1800B
VLDO1
U502
27
15
RX1800
VBAT
28
14
RX900B
AD6548
VDD
29
13
RX900
VCC_TXVCO
30
12
RX850B
EUSY0280101
TXOP_HI
31
11
RX850
TXOP_LO
32
10
VLDO3
9
GND
33
C526
39p
IP
C530
DNI
IN
No
Replace U502
again
LGE Internal Use Only
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