Only For Training And Service Purposes - LG KP235 Service Manual

(3) Checking TX I/Q
TEST POINT
C509
Figure 4.3.3
WAVEFORM
CHECKING FLOW
Check if there is
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Only for training and service purposes

C537
Any Major Difference
Refer to Graph4.3.4
Re-download the Software
And calibrate
4. TROUBLE SHOOTING
CIRCUIT
X500
3 4
2 1
26MHz
TSX-3225_26MHZ
C520
0.1u
RX1900B
25
RX1900
26
RX1800B
27
RX1800
28
RX900B
29
RX900
30
RX850B
31
RX850
32
GND
33
C532 C533
27p 39p
Graph 4.3.3
No
Replace U503
Similar?
Yes
- 47 -
QP
C509
NA
QN
2V75_VVCXO
C519
0.1u
VLDO2
16
VLDO1
U502
15
VBAT
14
AD6548 VDD
13
EUSY0280101 VCC_TXVCO
12
TXOP_HI
11
TXOP_LO
10
VLDO3
9
C527
0.1u
IP
C537
NA
IN
LGE Internal Use Only
R
C518
0.1u
C528 C52
27p 0.1u