LG GD510 Service Manual page 78

GD510 Operational Description
5.12.1. Checking DCXO Circuit
Checking Points
X601
TP1(C619) : 26MHz
Figur2. DCXO
DCXO Circuit Diagram
17
EN
16
VDDXO2V8
15
FSYS1
14
GND1
13
X601 TSX-3225
4
3
GND2 HOT2
1 2
HOT1 GND1
26MHz
Figure 3. DCXO Cicuit
LG Electronics
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Only for training and service purposes
of TP1(C619) similar to Fig.4?
RF_EN
C619 1n
26MHZ_MCLK
TP1
TP1
84/113
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Checking Flow
Is the waveform
Yes
DCXO Circuit is OK.
See next page to check
PLL Circuit.
Waveform
TP1 (C619)
Figure 4. DCXO Waveform
5. Trouble shooting
Revision A
No
Replace X601
LGE Property
LGE Internal Use Only