LG LG-E960 - Page 160

4. TROUBLE SHOOTING
- 160 -
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Only for training and service purposes
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4.21.2 Checking RefClk signal XTAL_XOP/XON (pin20/19)
Settings NFC mode on and check RefClk frequency: XTAL_XON/XON (pin 20/19) at approx 1V pk-pk and 26MHz using
oscilloscope.
START
26MHz OK?
Replace
Crystal Componet
No
Yes
Crystal CLK is OK/
See the next Step
L9002 330n
330nL9003
DNI
R9014
R9001 4.7K
4.7KR9002
8
7
10
11
29
28
19
20
33
34
SCL
SDA
XTAL_XOP
XTAL_XON
TX2
TX1
CLK_REQ
HOST_WAKE
NFC_WAKE
TM2
1ZCB26000AB0M
26MHz
X9001
21
34
180p
C9016
180p
C9019
0R9009
4.7KR9010
C9022
12p
C9023 12p
NFC_WAKE_BCM
CLK_REQ_BCM
VDD_EE
Rev.E
Rev.E
Keep away from noise trace
TP1
TP2
TP1
TP2
26MHz
26MHz