LG KG280 Service Manual - Page 45

Test Point, Checking Flow, Waveform, Circuit - software

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4. TROUBLE SHOOTING (3) Checking RX IQ TEST POINT U601 C634 C614 Figure 5 WAVEFORM 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 C634,C614. Check if there is any Major difference Refer to graph 3 Graph 3 Similar? Yes No Replace U601 Redownload software and calibration again LGE Internal Use Only - 46 - 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. TROUBLE SHOOTING
- 46 -
(3) Checking RX IQ
Redownload software and calibration again
Similar?
No
Replace U601
Yes
No
Check C634,C614.
Check if there is any
Major difference
Refer to graph 3
C614
C634
U601
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
TEST POINT
CHECKING FLOW
WAVEFORM
CIRCUIT
Graph 3
Figure 5