LG LM-X120HM Service Manual page 37

3.5 GSM, WCDMA, LTE PART
3.5.2 WCDMA PART
Checking RF Signal TX path(WCDMA/LTE_B4)
START
Check TP1
NO
Check TP2
NO
Check TP3
NO
Change U1301
and retest
LGE Internal Use Only
Checking Flow
Change U1513/L1561/L1559/
OK
L1560/ and retest RF
conductive
OK
Change U1502/L1409/L1410/
L1411 and retest
OK Change U1402/C1466/L1419/
C1465/C1463and retest RF
conductive
u1301
TP3
U1502
TP1
u1513
TP1
37
3. TROUBLE SHOOTING
Image
Circuit Diagram
TP3
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Only training and service purposes
u1402
TP2
TP2