LG U8290 Service Manual page 81

4. TROUBLE SHOOTING
Check TP1
VCC of VCXO
VCC ≥ 2.8V
Yes
Check TP2 TRK_LO_ADJ
2V ≥ Voltage ≥ 1V
Yes
Check TP3.4.5
With Oscilloscope
2V ≥ Voltage ≥ 1V
Yes
VCXO is OK
Check other part
No
CHECK R540 of PMIC (U509)
No
Check R227 of MSM(U208)
No
Check soldering and components
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