LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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(1) Checking Crystal Circuit
R508
X500
26 MHzO.K?
No
No
Crystal Circuit is OK
See next Page to check
Mobile SW
See next Page to check
Mobile SW
Yes
Change X500
C515
27p
47p
C509
0.1uF
C517
R514
1K
C510
39p
17
VCC_REF
16
VLDO2
REFINB
VAFC_NC
18
REFIN
20
19
1000p
C512
39p
C516
R508
0
26M
AFC
QN
QP
TEST POINT
CHECKING FLOW
CIRCUIT
WAVEFORM
Graph 4.2.1(a)
Graph 4.2.1(b)