LG GD510 - Page 78

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5. Trouble shooting
GD510 Operational Description Revision A
LG Electronics 84/113 LGE Property
5.12.1. Checking DCXO Circuit
Replace X601
NoG
Yes
DCXO Circuit is OK.
See next page to check
PLL Circuit.G
Checking Flow
TP1(C619) : 26MHzG
Checking PointsG
Figur2. DCXOG
DCXO Circuit DiagramG
Figure 3. DCXO CicuitG
Waveform
Figure 4. DCXO Waveform
G
Is the waveform
of TP1(C619) similar to Fig.4?
G
X601G
TP1 (C619)
TP1G
26MHz
TSX-3225X601
21
3
4
GND2 HOT2
HOT1 GND1
C619 1n
17
16
15
14
13
21 11 01
9 8
5V
1G
ID
D
DV
3SYSF
2SYSF
OX
X
OX
GND1
FSYS1
VDDXO2V8
EN
RF_EN
26MHZ_MCLK
TP1