Only For Training And Service Purposes - LG KP110 Service Manual

(3) Checking TX I/Q
TEST POINT
Figure 4.3.3
WAVEFORM
CHECKING FLOW
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP1
U503
TP2
Graph 4.3.3
Check i f there is
Similar ?
Any Major Difference
¨ Refer to Graph4. 3 .4
Re-download the Software
And calibrate
- 43 -
CIRCUIT
180
C515
39p
18
u
RX1900B
25
RX1900 VLDO2
26
RX1800B VLDO1
27
U503
RX1800 VBAT
28
RX900B VDD
AD6548
29
RX900 VCC_TXVCO
30
RX850B TXOP_HI
31
RX850 TXOP_LO
32
VLDO3
GND
33
EUSY0280101
IN
C535
39p
IP
No
Replace U503
Yes
QP
QN
16
15
14
13
12
11
10
9
X
LGE Internal Use Only