LG MG200 Service Manual page 75

4. TROUBLE SHOOTING
2. Sending Path problem
The voltage at R227
is 0.99V ~ 1.03V?
Yes
A few
tens or hundreds
of mV of signals at C241
are measured ?
Yes
The ABB is out of order.
Change the board.
Set audio part of the test
equipment to the echo mode.
No
Resolder the
R216, R220, R223
The
No
soldering of C241
is OK?
Yes
The
soldering of J201
is OK?
Yes
The earphone is OK?
Yes
The ABB is out of order.
Change the board.
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No
Resolder
the C241
No
Resolder
the J201
No
Change the
Earphone.