LG -E400f Service Manual page 59

Check TCXO Block Refer to 1.3
If DCS/PCS(TP3) over 6 dBm?
Still exist Problem
LGE Internal Use Only
START
No
Check TP1
If GSM over 31 dBm?
If DCS/PCS over 8 dBm?
No
Check TP, 3
If GSM(TP) under 6 dBm?
No
Check RTR & PAD
Change the board
Yes
GSM/DCS/PCS Tx is OK
Check other part
Yes
Check Tx Module
(ASM+EDGE PAM)
Refer to 4.4
No Problem
Check soldering and components
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4. TROUBLE SHOOTING
Only for training and service purposes