LG LG-K430DSF - Page 44

3. TROUBLE SHOOTING
44
Copyright ⓒ 2016 LG Electronics. Inc. All right
reserved. Only training and service purposes
http://eduwebcell.blogspot.com/
3.7 LTE RF PART
3.7.3 Checking RF Signal RX path(LTE B3)
Image
Checking Flow
Circuit Diagram
TP2
TP1
Main
Top
TP1
TP2
FL1107
START
Check TP1 Signal exist?
Replace U1002
NO
YES
Check TP2 Signal exist?
Check FL1107
Soldering and
Check
NO
Component
above RF signal
path
YES
Check Transceiver
physical damage
or soldering condition
Replace U1500
NOT GOOD
OK?
Check next step