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Does not the sound of the audio signal input to USB go out?
YES
Is USB stick audio format correct?
YES
MAIN
Is the USB +5V Q7105 sent to pin (1) of CN1104?
YES
Is the USB con (CN1104) signal properly sent to
pin (233) (USB_DM0) and pin (234) (USB DP0) of
IC U2102?
YES
Refer to "No sound output in all modes".
No sound from external input devices (3)
NO
NO
NO
25
Change to correct mp3 format
Check the connection to Q7105 and the external
input device.
Check the line between CN1104 and IC2102
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