LG LG-K430DSF - Page 56

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3. TROUBLE SHOOTING
TP1
TP2
3.7 LTE RF PART
3.7.13 Checking RF Signal TX path(LTE B7)
Image
Checking Flow
Circuit Diagram
Main
Top
U1100
TP1
TP2
FL1111
U1002
START
Check TP1
Signal is over 21dBm?
Replace U1002
and
Check
Component
NO
above RF signal
path
YES
Check TP2
Signal is over 23.5dBm?
Replace U1100
NO
YES
Check Transceiver
physical damage
or soldering condition
Replace U1500
NOT GOOD
OK?
Check next step