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5.14.1 Checking DCXO Circuit
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Trouble shooting
- 93 -
Replace X100
Yes
No
DCXO Circuit is OK.
See next page to check
PLL Circuit.
1pin : 26MHz
1pin
X100
Is the waveform
of 1pin Similar to Fig.6?
DCXO
DCXO Cicuit DCXO Waveform
XO
W8
W7
XOX
REFR
U4
G19
CLKOUT0
CC_CLK
U9
V10
CC_IO
V9
CC_RST
26MHz
X100
NX3225SA
GND1
2
4
GND2
HOT1
1
3
HOT2
CHG_EN
SIM_DATA
SIM_CLK
SIM_RST
1pin