LG LG-K430DSF - Page 27

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3. TROUBLE SHOOTING
3.5 GSM RF PART
3.5.9 Checking RF Signal TX path(GSM850/900)
Image
Checking Flow
Circuit Diagram
TP2
TP1
Main
Top
U1100
TP2
TP1
START
NO
Check TP1/2
If GSM850/900 Over 9dBm?
Replace U1100
YES
NO
Check Transceiver
physical damage
or soldering condition
Replace U1500
NOT GOOD
OK?
Check next step
TP2
TP1