LG GT350 - Page 89

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4. TROUBLE SHOOTING
LG Electronics 86/115 LGE Property
4.12.1 Checking DCXO Circuit
Replace
X601
No
Yes
DCXO Circuit is OK.
See next page to check
PLL
C
ir
cu
i
t.
TP1
(
C616
)
: 26MHz
Checking Points
Figur2. DCXO
DCXO Circuit Diagram
Figure 3. DCXO Cicuit
Waveform
Figure 4. DCXO Waveform
Is the waveform
of TP1(C616) similar to Fig.4?
TP1 (C616)
TP1
Checking Flow
X601
26MHZ
TSX-3225
21
3
4
GND2 HOT2
HOT1 GND1
18
17
16
15
14
13
2
1
11 01
3SYS
F
2SYSF
OX
X
OX
GND1
FSYS1
VDDXO2V8
EN
VDDVCO2V8
VCO_RC
0.001uFC616
0.047uF
C617
R612
820
RF_EN
26MHZ_MCLK
TP1