LG LM-X120HM Service Manual page 43

3.5 GSM, WCDMA, LTE PART
3.5.2 WCDMA PART
Checking RF Signal TX path(WCDMA/LTE_B8)
Checking Flow
START
Check TP1
NO
Check TP2
NO
Check TP3
NO
Change U1301
and retest
LGE Internal Use Only
Change U1513/L1519/L1520/
OK
L1521 and retest RF
conductive
OK
Change U1524/C1411/L1402/
C1412 and retest
Change U1402/C1430/R1401/
OK
R1402/C1467 and retest RF
conductive
TP1
U1524
TP1
u1513
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43
3. TROUBLE SHOOTING
Image
U1301
TP3
Circuit Diagram
TP3
TP2
Only training and service purposes
U1402
TP2