LG D410 Service Manual page 61

LGE Internal Use Only
Start
Check XO Block Refer to 3.3
Check TP1
If GSM over 31 dBm ?
If DCS/PCS over 28 dBm ?
No
Check TP2, 3
If GSM(TP2) under 6 dBm ?
If DCS/PCS(TP3) under 6 dBm ?
No
Check WTR2605
Yes
GSM/DCS/PCSTx is OK
Check the other part
Yes
Check Tx Module
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3. TROUBLE SHOOTING
Only for training and service purposes