LG -UD6100 Service Manual page 30

4.2.2 Check Duplexer & Mobile SW
TEST POINT
DP101 PIN6
DP_out
Circuit Diagram
Circuit Flow
Check DP101 Pin6
Level is Appear?
DUP_OUT
Check U101 Pin1 Level is Appear?
Replace QSC6010
Mobile S/W
Duplexer
DP101
NO
Replace DP101
YES
NO
Replace U101
YES
U101 PIN1
Mobile S/W in