LG KP260 Service Manual page 41

4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
TEST POINT
X401
CIRCUIT
C520
0.1u
2V8_VMEM
TP1
C522
0.1u
WAVEFORM
Graph 4.2.1(a)
LGE Internal Use Only
TP2
26 MHzO.K?
Change X500
TP1
VBAT 2V75_VVCXO
C513
1000p
- 42 -
CHECKING FLOW
Crystal Circuit is OK
Yes
See next Page to check See next Page to check
Mobile SW Mobile SW
No No
U500
Not Mount
TP2
5
VCC
2 4
GND
3
R509
0
26M_DBB
Graph 4.2.1(b)
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2V75_VVCXO
26M_BT
C514
2.2u