LG LG-K430DSF - Page 48

3. TROUBLE SHOOTING
48
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3.7 LTE RF PART
3.7.6 Checking RF Signal RX path(LTE B28B)
Checking Flow
Main
Image
TP2
U1500
START
Top
Check TP1 Signal exist? Replace U1002
NO
TP1
YES
Check TP2 Signal exist?
YES
Check FL1102
Soldering and
Check
Component
NO
above RF
signal path
Check Transceiver
physical damage
or soldering condition
OK?
NOT GOOD
Replace U1500
TP1
Circuit Diagram
TP2
Check next step