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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.13.1. Checking DCXO Circuit
Checking Points
Checking Flow
DCXO Circuit Diagram
Waveform
Figure 3. DCXO Cicuit
Figure 4. DCXO Waveform
Replace X400
No
Yes
DCXO Circuit is OK.
See next page to check
PLL Circuit.
TP1(C439) : 26MHz
Is the waveform
of TP1(C439) similar to Fig.6?
X400
X400
26MHz
GND1 2
4
GND2
HOT1
1
3
HOT2
NX3225SA
15
VDDXO2V8
11
XO
XOX
12
16
FSYS1
14
FSYS2
GND1
13
C439
1000p
26MHZ_MCLK
TP1 (C439)
Figur2. DCXO
Содержание KF350
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