LG LM-X120HM Service Manual page 31

3.5 GSM, WCDMA, LTE PART
3.5.2 WCDMA PART
Checking RF Signal TX path(WCDMA/LTE_B1)
Checking Flow
START
OK
Check TP1
NO
OK
Check TP2
NO
OK
Check TP3
NO
Change U1301
and retest
LGE Internal Use Only
u1301
Change U1513/L1532/C1541/
L1530/ and retest RF
conductive
Change U1521/C1481/L1451/
C1480 and retest
Change U1402/C1466/L1419/
C1465/C1463and retest RF
conductive
TP3
u1521
TP1
u1513
Circuit Diagram
TP1
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31
3. TROUBLE SHOOTING
Image
TP3
Only training and service purposes
TP2
U1402
TP2