Only For Training And Service Purposes - LG GM200 Service Manual

4. TROUBLE SHOOTING
CHECKING FLOW
START
YES
Is CN302
(JACK DETECT : TP1)
LOW?
YES
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
Can you hear
the sound from
the earphone?
Resolder U103,Q201,R208,U202,C202,C204,
LGE Internal Use Only
LGE Internal Use Only
NO
Check L205, U103
Change the earphone
and try again
205,R205,C217,U205,
Can you hear
the sound from
the earphone?
NO
- 102 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Check U203, FB301,FB302,
YES
When you call,
NO
can you hear sound at center speaker
in speakerphone mode?
NO
Can you hear
the sound from
the earphone in the mp3 mode?
yes
Resolder C221,C227

Only for training and service purposes