Service manual

4. TROUBLE SHOOTING
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.3 Checking TCXO Block
The output frequency (19.2MHz) of TCXO (X2001) is used as the reference one of RTR6285 and PM7540 internal
VCO.
Schematic of the Crystal Part (19.2MHz)
TP1
TP2
TP3
X200
KT2520F19200DCW28RAK
19.2MHZ
43
52
61
VCONTROL
VCC
NC1 NC2
GND OUT
1n
C224
C223 27p
0.1u
C215
VREG_TCXO_2.85V
10n
C222
100
R203
1n
C214
TRK_LO_ADJ
TCXO_RTR_19.2MHZ
TCXO_PM_19.2MHZ
Clesed to TCXO
TP1
TP3
TP2
4.3 Checking TCXO Block
The output frequency (19.2MHz) of TCXO (X2001) is used as the reference one of RTR6285 and PM7540 internal VCO.