LG LM-X120HM Service Manual page 47

3.5 GSM, WCDMA, LTE PART
3.5.3 LTE PART
Checking RF Signal TX path(LTE_B3)
START
Check TP1
NO
Check TP2
NO
Check TP3
NO
Change U1301
and retest
LGE Internal Use Only
Checking Flow
Change U1513/L1525/C1515/
OK
L1526 and retest RF
conductive
OK Change U1514/C1415/L1540/
C1416 and
retest
Change U1402/C1466/L1419/
OK
C1465/C1463 and retest RF
conductive
TP1
Main
bot
U1402
TP2
Copyright ⓒ 2019 LG Electronics. Inc. All right reserved.
47
3. TROUBLE SHOOTING
Image
TP3
Circuit Diagram
TP3
Only training and service purposes
U1301
U1514
TP1
U1513
TP2