LG LM-X120HM Service Manual page 59

3.5 GSM, WCDMA, LTE PART
3.5.3 LTE RF PART
Checking RF Signal TX path(LTE_B28B)
START
OK
Check TP1
NO
OK
Check TP2
NO
OK
Check TP3
NO
Change U1301
Circuit Diagram
and retest
TP1
LGE Internal Use Only
Checking Flow
Change U1513/R1513/L1531/R1530/
L1564/C1531/L1563/U1523
and retest RF conductive
Change U1402/C1425/L1480/
C1426 and
retest
Change C1430/R1401/
R1402/C1467 and retest RF
conductive
Main
bot
U1402
U1701
U1513
TP2
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59
3. TROUBLE SHOOTING
Image
TP3
Only training and service purposes
U1606
U1523