LG KG280 Service Manual - Page 51

TEST POINT, CIRCUIT, Checking Flow, Waveform

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4. TROUBLE SHOOTING (4) Checking TX IQ TEST POINT Waveform C634 C614 Figure 10 Graph 7 CIRCUIT QN C614 39p QP 17 VAFC_NC VCC_REF REFINB 18 20 19 21 Q 22 24 23 REFIN QB REF_OP VCC_BBQ C625 0.1u VCC_FE IB VCC_BBI RX1900B 25 26 RX1900 VLDO2 16 27 RX1800B RX1800 U601 VLDO1 VBAT 15 28 29 RX900B AD6549 VDD 14 13 30 RX900 VCC_TXVCO 12 31 RX850B RX850 TXOP_HI TXOP_LO 11 32 VLDO3 10 9 33 GND SDATA SEN NC 7 SCLK 3I 8 5 6 4 1 2 EUSY0280103 IP C634 39p IN Checking Flow Check if there is Any Major Difference Refer to Graph7 Similar? Yes No Replace U101 Redownload the Software And calibrate LGE Internal Use Only - 52 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
(4) Checking TX IQ
4. TROUBLE SHOOTING
- 52 -
C614
C634
C634
39p
39p
C614
VCC_TXVCO
12
13
VDD
15
VLDO1
VLDO2
16
9
VLDO3
25
RX1900B
RX850
32
31
RX850B
RX900
30
29
RX900B
SCLK
6
5
SDATA
7
SEN
11
TXOP_HI
TXOP_LO
10
18
VAFC_NC
VBAT
14
VCC_BBI
4
24
VCC_BBQ
1
VCC_FE
VCC_REF
17
GND
33
I
2
3
IB
NC
8
Q
23
22
QB
20
REFIN
REFINB
19
REF_OP
21
RX1800
28
27
RX1800B
RX1900
26
EUSY0280103
AD6549
U601
0.1u
C625
QN
QP
IN
IP
Redownload
the Software
And calibrate
Check if there is
Any Major Difference
Refer to Graph7
Similar?
Yes
No
Replace U101
TEST POINT
CIRCUIT
Checking Flow
Waveform
Graph 7
Figure 10