LG U300 Service Manual page 80

For testing, Max power output is needed.
Set the Phone Tx is ON
and PDM is 450
YES
Check TP1
Over 21dBm ?
NO
YES
Check TP2
Over 19dBm ?
NO
YES
Check TP3
Over 16dBm ?
NO
YES
Check TP4
Over -5dBm ?
NO
Change the board
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4. TROUBLE SHOOTING
RF Tx Level is OK
Check FEM
Check Duplexer
Check PAM Block
Refer to 3.5.4