LG LM-X120HM Service Manual page 24

3.5 GSM, WCDMA, LTE PART
3.5.1 GSM RF PART
Checking RF Signal RX path(GSM850)
START
Check TP1
NO
Check TP2
OK?
Change U1301
and retest
LGE Internal Use Only
Checking Flow
YES
Change U1513 and
retest RF conductive
NOT GOOD
Change U1509 and
Matching circuit retest
Main
Bot
TP2
TP1
Circuit Diagram
TP1
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3. TROUBLE SHOOTING
Image
U1301
U1509
U1513
TP2
Only training and service purposes