LG MG370 Service Manual page 66

DCXO
Checking Points
X100
Pin 1: 26MHz
D12
REXT
A9
XOX
A8
XO
A13
TX2
A14
TX1
< DCXO Circuit>
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
X100 NX3225SA
4
HOT2 3
GND2
1 HOT1 2
GND1
26MHz
DCS_PCS_OUT
GSM_OUT
- 65 -
4. TROUBLE SHOOTING
CHECKING FLOW
Is the waveform
of Pin3 similar to
DCXO(X100)
Waveform?
Yes
DCXO Circuit is OK.
See next page to check
PLL Circuit.
Waveform
Pin 2
Pin 1
<DCXO Waveform>
No
Replace X101
LGE Internal Use Only