LG LM-X120HM Service Manual page 25

3.5 GSM, WCDMA, LTE PART
3.5.1 GSM RF PART
Checking RF Signal RX path(GSM900)
Checking Flow
START
Check TP1
NO
Check TP2
NO
Change U1301
and retest
LGE Internal Use Only
OK Change U1513/L1519/L1520/
L1521 and retest RF conductive
Change U1524/L1548/R1531/
OK
R1532/L1522/L1523/L1524/C1
512 and retest
Image
Main
bot
TP2
U1513
Circuit Diagram
TP1
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25
3. TROUBLE SHOOTING
U1301
U1524
TP1
Only training and service purposes
TP2