LG G5500 Manual page 78

1. Earphone detection problem
The Voltage
at Pin1 of U304
is 0V?
Yes
The voltage
at R316,R312
is 0.02V ~ 0.25V?
Yes
The ABB is out of order.
Change the board.
The soldering
No
of C687,R311,
R665 is
OK?
Yes
The soldering of J301
is OK?
Yes
The soldering of U304
is OK?
Yes
The soldering
No
of R316,R312
is OK?
-79-
No
No
Resolder the J301.
No
Yes
The ABB is out of order.
Change the board.
No
Resolder the
C687,R311, R665.
Resolder
the U304
Resolder
the R316,R312