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U250
Service manual
Checking Vc-Tcxo Block - LG U250 Service Manual
Lg cell phone user manual
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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4.4 Checking VC-TCXO Block
The reference frequency (19.2MHz) from X100 (VC-TCXO) is used in UMTS
TX part, GSM part and BB part.
VREG_TCXO_2.85V
TP1
TP4
C185
TCXO_PM
C187
RTR6275_TCXO
TP3
TP2
DSA321SCE-19.2M
NC3
7
NC4
8
OUTPUT
3
VCC
4
100p
1000p
C188
Schematic of the VC-TCXO Block
TP1
Test Point of the VC-TCXO Block
- 77 -
4. TROUBLE SHOOTING
TCXO
X100
NC2
6
NC1
5
GND
2
100ohm
VCONT
1
19.2MHz
R128
100K
VCC
5
0.01u
2
4
U104
3
GND
TC7SH04FU
TP3
TP4
R124
TRK_LO_ADJ
TP2
C186
1000p
TCXO_BT
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Table of Contents
Troubleshooting
TROUBLE SHOOTING
72
Power ON Troubleshooting
93
Charger Troubleshooting
95
USB Troubleshooting
98
SIM Detect Troubleshooting
99
Camera Troubleshooting
101
Keypad Backlight Troubleshooting
104
Main LCD Troubleshooting
105
Troubleshooting Download Errors
128
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