Only For Training And Service Purposes - LG KG280 Service Manual

4. TROUBLE SHOOTING
(4) Checking TX IQ
TEST POINT
C634
Figure 10
CIRCUIT
Checking Flow
LGE Internal Use Only
C614
QN
C614
39p
QP
C625
0.1u
IP
C634
IN
Check if there is
Any Major Difference
Refer to Graph7
Redownload the Software
And calibrate
Waveform
Graph 7
RX1900B
25
RX1900
26
RX1800B
U601
27
RX1800
28
AD6549
RX900B
29
RX900 VCC_TXVCO
30
RX850B TXOP_HI
31
RX850 TXOP_LO
32
GND
33
EUSY0280103
39p
No
Replace U101
Similar?
Yes
Copyright © 2007 LG Electronics. Inc. All right reserved.
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VLDO2
16
VLDO1
15
VBAT
14
VDD
13
12
11
10
VLDO3
9

Only for training and service purposes