LG LM-X120HM Service Manual page 34

3.5 GSM, WCDMA, LTE PART
3.5.2 WCDMA PART
Checking RF Signal TX path(WCDMA/LTE_B2)
Checking Flow
START
Check TP1
NO
Check TP2
NO
Check TP3
NO
Change U1301
and retest
LGE Internal Use Only
Change U1513/L1536/C1521/
OK
L1537/ and retest RF
conductive
OK
Change U1516/C1413/L1405/
C1414 and retest
OK Change U1402/C1466/L1419/
C1465/C1463and retest RF
conductive
u1301
U1516
34
3. TROUBLE SHOOTING
Image
TP3
TP1
u1513
Circuit Diagram
TP1
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Only training and service purposes
U1402
TP2
TP2
TP3