LG LG-K430DSF - Page 50

3. TROUBLE SHOOTING
50
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3.7 LTE RF PART
3.7.8 Checking RF Signal DRX path(LTEB3/B7/B20)
Image
Checking Flow
START
Check TP1/2 Signal exist?
NO
Check SW1103/SW1000
Soldering
YES
Check TP3/4/5 Signal exist?
Check U1003 Soldering and
Check Component
NO
above RF signal path
YES
Check TP6/7/8 Signal exist?
NO
Check
FL1006/FL1005/FL1101
Soldering and
Check Component
above RF signal path
YES
Check Transceiver
physical damage
Replace U1500
or soldering condition
NOT GOOD
OK?
Check next step
TP6
Main
Top
TP2
SW1000
TP8
TP7
TP5
Main
BOT
Main
BOT
SW1003
TP1
TP3
TP4