LG LG-K430DSF - Page 57

57
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3. TROUBLE SHOOTING
Main
Top
U1100
U1500
FL1103
TP2
U1002
TP1
3.7 LTE RF PART
3.7.14 Checking RF Signal TX path(LTE B28A)
Checking Flow
Image
TP3
START
Check TP1
Signal is over 21dBm?
NO
Replace U1001 and
Check Component
above RF signal path
YES
Check TP2/3
Signal is over 23.5dBm?
Replace U1100
NO
YES
Check Transceiver
physical damage
or soldering condition
Replace U1500
NOT GOOD
OK?
Check next step