Only For Training And Service Purposes - LG GM210 Service Manual

4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
TEST POINT
X501
Figure 4.2
CIRCUIT
1
I
2
IB
3
VSUP_BBI
4
REF_SEL
5
SEL_26M U500
6
VLDO3_DRV AD6546
7
TXOP_LO
8
TXOP_HI
9
VLDO3_VCO
10
VBAT1
WAVEFORM
TP1
LGE Internal Use Only
LGE Internal Use Only
CHECKING FLOW
TP1
0.1u
QP
C507
30
39p
Q
29
QB QN
28
SCLK S_CLK
27
SDATA S_DATA
26
SEN S_EN
25
VDD
24
REF_OP
23
REFIN
22
X501
REFINB
21
4
VSUP_REF
1
26MHz
- 60 -
26MHz is
Yes
Crystal Circuit is OK
ok?(TP1)
See next Page to check See next Page to check
Mobile SW Mobile SW
No
Change X501
2V93_VEXT
(GPIO_074)
(GPIO_073)
(GPIO_072)
3
DSX321G-26M
2
Graph 4.1
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP1
TP1
C509 1000p