LG L1150 Service Manual page 79

4. TROUBLE SHOOTING
1. Earphone Detection problem
The Voltage at "ADIN1"
is 0V?
Yes
The voltage at R220
is 0.02V ~ 0.25V?
Yes
The ABB is out of order.
Change the board.
2. Sending Path problem
Set audio par
equipment to the echo mode.
The voltage at R218
is 1.1V ~ 1.3V?
Yes
A few tens or hundreds
of mV of signals at C223
are measured?
Yes
The ABB is out of order.
Change the board.
No
No
t of the test
Resolder the
No
R223, R225.
No
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The soldering of R223, R225
is OK?
Yes
The soldering of J201
is OK?
Yes
The ABB is out of order.
Change the board.
Yes
The soldering of R220
is OK?
The soldering of C223,
R233 is OK?
Yes
The soldering of J201 is OK?
Yes
The earphone is OK?
Yes
The ABB is out of order.
Change the board.
No
Resolder the
R223, R225.
No
Resolder the J201.
No
Resolder the R220.
No Resolder
the C223, R233.
Resolder
No
The U201.
No
Change the
Earphone.