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No sound from external input devices (2) 
Does not the sound of the audio signal input to VGA go out? 
MAIN UNIT: 
YES 
NO 
Is the audio signal properly sent to pin (3) and pin (2) of 
CN1102?
 
NO 
Check the connection to CN1102 and the external input device.
Is the audio signal properly sent to pin (67) 
(AIN1_R) and pin (69) (AIN1_L) of IC 
U2102? 
Check the line between CN1102 and IC U2102. 
YES 
Refer to “No sound output in all modes”.