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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
X501
(1) Checking Crystal Circuit
26MHz is
ok?(TP1)
No
Crystal Circuit is OK
See next Page to check
Mobile SW
See next Page to check
Mobile SW
Yes
Change X501
Graph 4.1
TEST POINT
CIRCUIT
WAVEFORM
CHECKING FLOW
TP1
TP1
TP1
Figure 4.2
(GPIO_073)
(GPIO_072)
(GPIO_074)
2V93_VEXT
20
VBAT1
10
17
VBA
T2
VDD
25
VLDO1
18
VLDO2
19
VLDO3_DRV
6
9
VLDO3_VCO
VS
UP_AM
14
3
VSUP_BBI
VS
UP_BBQ
31
VS
UP_FE
40
21
VSUP_REF
4
35
RX1800
RX1800B
34
33
RX1900
32
RX1900B
39
RX850
RX850B
38
37
RX900
RX900B
36
28
SCLK
SDATA
27
SEL_26M
5
26
SEN
TXOP_HI
8
7
TXOP_LO
15
TX
_F
B
VAFC
AD6546
U500
APC
12
GND
41
I
1
2
IB
16
NC1
13
NC2
Q
30
29
QB
11
RAMP
REFIN
23
22
REFINB
24
REF_OP
REF_SEL
0.1u
C507
39p
26MHz
X501
DSX321G-26M
1
2
3
4
C509
1000p
QP
QN
S_CLK
S_DATA
S_EN
TP1