Only For Training And Service Purposes - LG -S310 Service Manual

4. TROUBLE SHOOTING
Checking Points and Flow
start
NO
All KEY_OUT are High? Change the Main Key FPCB or
All KEY_IN are Low? Main Board. And retest
YES
Key press
YES
KEY_IN and KEY_OUT of pressed
Change the Main Board
key are Pulse waveform?
NO
Change the Main Key FPCB and retest
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Only for training and service purposes