LG LM-X120HM Service Manual page 40

3.5 GSM, WCDMA, LTE PART
3.5.2 WCDMA PART
Checking RF Signal TX path(WCDMA/LTE_B5)
START
OK
Check TP1
NO
OK
Check TP2
NO
OK
Check TP3
NO
Change U1301
and retest
Circuit Diagram
TP1
LGE Internal Use Only
Checking Flow
Change U1513/L1517/C1510/
L1513 and retest RF
conductive
Change U1509/L1425/C1409/
L1401/C1410 and retest
Change U1402/C1430/R1401/
R1402/C1467 and retest RF
conductive
U1301
U1509
U1513
TP2
TP3
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40
3. TROUBLE SHOOTING
Image
U1402
Only training and service purposes