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(3) Checking RX I/Q
TEST POINT
WAVEFORM
CHECKING FLOW
Check TP7,8.
Check if there is any
Major difference
Refer to graph 4.2.3
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP7
Figure 4.2.3
TP8
Similar?
Yes
Redownload software and calibration
Graph 4.2.3
No
No
Replace U502
again
- 45 -
4. TROUBLE SHOOTING
CIRCUIT
QP
C505
TP7
DNI
QN
2V75_VVCXO
C509
0.1u
RX1900B
25
RX1900
VLDO2
26
16
RX1800B
VLDO1
U501
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
C521
C522
27p
39p
IP
C526
DNI
TP8
IN
LGE Internal Use Only
TP7
TP8
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