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LGE Internal Use Only
3. TROUBLE SHOOTING
3.5.2.3
Checking RF signal path
3.5 WCDMA RF PART
Checking Flow
Battery voltage
higher than 3.5V?
Change or charging
the Battery
Check PA in TP7
Re-solder or change
U1503
Check PA out TP5
Re-solder or change
U406
Check duplexer TRX TP2
NO
START
Check duplexer TXM TP1
Re-solder or change
U1506
YES
YES
YES
YES
Copyright
ⓒ
2017 LG Electronics. Inc. All right rese
rved. Only training and service purposes
Main
Bot
TP4
TP5
TP6
TP7
U1405
U1505
TP3
U1503
TP1
RF Matching
Component
U1301
U1506
TP2
Main
Top
TP2
TP3
Circuit Diagram
37