LG L602i Service Manual page 75

4. TROUBLE SHOOTING
Check TP1
VCC of TCXO
No
VCC ≥ 2.8V
Yes
Check TP2
J
TRK_LO_AD
No
3V≥ Voltage≥ 0V
Yes
Check TP3,4
With scilloscope
No
3V≥ Voltage≥ 0V
Yes
VCXO is OK
Check other part
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Check PMIC
Check MSM
Check soldering
and components