LG GD310 Service Manual page 89

5. TROUBLE SHOOTING
5.12.1. Checking DCXO Circuit
Checking Points
X400
TP1(C405) : 26MHz
Figur2. DCXO
DCXO Circuit Diagram
16
VDDXO2V8
15
FSYS1
14
GND1
13
X400 NX3225SA
4
3
GND2 HOT2
1 2
HOT1 GND1
26MHZ
Figure 3. DCXO Circuit
LGE Internal Use Only
of TP1(C405) similar to Fig.4?
DCXO Circuit is OK.
See next page to check
C405 1000P
26MHZ_MCLK
TP1
TP1
- 90 -
Checking Flow
Is the waveform
Yes
PLL Circuit.
Waveform
TP1 (C405)
Figure 4. DCXO Waveform
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Only for training and service purposes
No
Replace X400