Only For Training And Service Purposes - LG GT500 Service Manual

4. TROUBLE SHOOTING
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LGE Internal Use Only
START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Does the sine wave appear
at C343(TP1),C344(TP2)?
YES
Does the sine wave appear
at U301 ?
YES
Does the sine wave appear
at R352(TP3),R353(TP4) ?
YES
Can you hear sine wave
out of a speaker ?
YES
END
NO
Change the main board
NO
Change the U301
NO
Change the U301
NO
Change each Speaker
- 98 - Copyright © 2009 LG Electronics. Inc. All right reserved.
The sine wave not appear

Only for training and service purposes