LG GW620 - Checking TCXO Block

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
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4.3 Checking TCXO Block
The output frequency (19.2MHz) of TCXO (X101) 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
0.1UF
C103
33ohms
R51
R22
100Kohms
C244
100pF
100pFC243
VREG_TCXO_2.85V
C325
0.001uF
C41
0.01uF
smho094R
VREG_USB_1.8V
R65 100ohms
0.1UF
C102
TC7SH04FS
U5
2
41
5
VCC
GND
19.2MHz
DSA321SCA X1
21
34
VDDOUT
VCONTGND
C323 0.001uF
0.001uFC324
USBH_REF_CLK
TCXO_PM_19.2MHz
RTR_TRK_LO_ADJ
TCXO_RTR_19.2MHZ
Near TCXO
TCXO
TP1
TP3
TP2