LG -E450 Service Manual page 48

4.1.1.4 Checking RF signal path (FEM)
Check TP1(L120) at FL103
Check if there is any major difference referring
To Figure 4.1.1(b) Is any signal detected at
All WCDMA_B1 Rx check is complete.
If the phone sill do not work ,replace main board
LGE Internal Use Only
START
that point?
Yes
Is any signal detected at
that point?
Yes
No
Check C164, L119, C153, C161
No
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4. TROUBLE SHOOTING
Replace FL103
Only for training and service purposes