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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. TROUBLE SHOOTING
5.12.1. Checking DCXO Circuit
Replace X400
No
Yes
DCXO Circuit is OK.
See next page to check
PLL Circuit.
Checking Flow
TP1(C405) : 26MHz
Checking Points
Figur2. DCXO
DCXO Circuit Diagram
Figure 3. DCXO Ci
r
cuit
Waveform
Figure 4. DCXO Waveform
Is the waveform
of TP1(C405) similar to Fig.4?
X400
TP1 (C405)
TP1
1000P
C405
16
15
14
13
2
1
1
1
O
X
X
O
X
GND1
FSYS1
VDDXO2V8
26MHZ
X400
NX3225SA
2
1
3
4
GND2
HOT2
HOT1
GND1
26MHZ_MCLK
TP1