LG -E400f Service Manual page 54

LGE Internal Use Only
Set the phone Rx is On
Check BIAS over .1 V?
Yes
Check TP1 Signal exist?
Yes
Check TP Signal exist?
Yes
Check TP3 Signal exist?
Yes
Check TP4 Signal exist?
Yes
Check TP5 Signal exist?
Yes
Change the board
No
Check bias block soldering
No
Check RF Switch (M/S)
No
Check TX Module Refer 1.4
No
Check Duplexer
No
DNI  SKIP
No
Check RTR685 and Rx SAW filter
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4. TROUBLE SHOOTING
Only for training and service purposes