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4. TROUBLE SHOOTING
(2) Checking RX I/Q
TEST POINT
C537
U502
WAVEFORM
CHECKING FLOW
Check C509, C537.
Check if there is any
Major difference
Refer to graph 4.2.3
LGE Internal Use Only
C509
Similar?
Yes
Redownload software and calibration again
- 42 -
CIRCUIT
C509
NA
2V75_VVCXO
RX1900B
25
RX1900
VLDO2
26
RX1800B
VLDO1
U502
27
RX1800
VBAT
28
RX900B
AD6548
VDD
29
RX900
EUSY0280101
VCC_TXVCO
30
RX850B
TXOP_HI
31
RX850
TXOP_LO
32
VLDO3
GND
33
C537
NA
No
No
Replace U502
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
QP
QN
C519
0.1u
16
15
14
13
12
11
10
9
IP
IN
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