Does not the picture display when USB cable plugged into USB port?
Is USB stick video format correct?
YES
Main UNIT:
Is the USB +5V sent to pin (1) of
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 "The picture doesn't appear in
<External input USB>No picture on the display (6)
Change to correct .jpg or .jpeg or .png or
NO
.bmp format.
Check the fuse F1101 and the external
NO
input device.
NO
Check the line between CN1104 and IC
33