- 80 -
LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
XU{yv|islGzovv{punG G
G
4.3 Checking TCXO Block
The output frequency (19.2MHz) of TCXO (X200) is used as the reference one of RTR6285 and PM7540 internal
VCO.
Schematic of the Crystal Part (19.2MHz)
TP3
TP2
TP1
TP2
TP3
TP1
R208
220
R210
100K
U201
3
2
4
1
5
VCC
GND
C220
0.1u
C221
330p
VREG_MSMA_2.6V
VREG_TCXO_2.85V
330p
C210
330p
C207
C205
1n
C206
0.1u
19.2MHz
KT3225L19200DCW28RA0
X200
4
2
3
1
VCONT
OUT
GND
VCC
R205
100
R209
33
C208
10n
TCXO_EN
TCXO_RTR_19.2MHZ
TCXO_PM_19.2MHZ
RTR_TRK_LO_ADJ
USBH_SYSCLK
Clesed to TCXO
TCXO Circuit
1.0T
FFA Rev.C(220Ohm@100MHz)
TP2
TP1
TP3