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LG U300 Service Manual page 73

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4. TROUBLE SHOOTING
VCC of VCXO
TRK_LO_ADJ
3V Voltage 0V
With Oscilloscope
3V Voltage 0V
Check other part
Check TP1
No
≥
VCC
2.8V
Yes
Check TP2
No
≥
≥
Yes
Check TP3,4,5
No
≥
≥
Yes
VCXO is OK
- 74 -
Check PMIC
Check MSM
Check soldering
and components

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U300c

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