LG LM-X120HM Service Manual page 50

3.5 GSM, WCDMA, LTE PART
3.5.3 LTE PART
Checking RF Signal TX path(LTE_B7)
START
Check TP1
NO
Check TP2
NO
Check TP3
NO
Change U1301
and retest
TP1
LGE Internal Use Only
Checking Flow
Change U1513/L1550/C1519/
OK
L1544 and retest RF
conductive
OK Change U1515/C1408/L1407/
C1407 and
retest
Change U1402/C1461/R1405/
OK
C1460/C1476 and retest RF
conductive
Circuit Diagram
Main
bot
TP2
U1402
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50
3. TROUBLE SHOOTING
Image
TP3
TP1
TP3
TP2
Only training and service purposes
U1301
U1515
U1513