So I searched the forums for about an hour to see if anyone had the problem i was having and didn't find much. Im powering my 7" lilliput 629 off an opus 150 and the screen give me nice and clear picture. For some reason, the touchscreen only works when i connect the lilliput using the wall powersupply. If i switch power source to my opus, i get not flicker and clear picture but no touchscreen response.

I checked device manager and it recognizes the usb mouse properly....but the screen isn't sending any input through usb.

Any ideas?