LG LG-K430DSF - Page 21

21
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3. TROUBLE SHOOTING
3.5 GSM RF PART
3.5.3 Checking RF Signal RX path(GSM850/900)
Checking Flow Image
TP4
TP2
TP1
TP3
Circuit Diagram
TP4
TP2
TP1
TP3
Main
Top
FL1104
FL1105
START
Check TP1/2 Signal exist?
NO
Replace U1002
YES
Check TP3/4 Signal exist?
NO
Check
Component
above RF signal
path
YES
Check Transceiver
physical damage
or soldering condition
Replace U1500
NOT GOOD
OK?
Check next step