hi all!
i had the same problem with my FA1011 : combined HDMI + USB cable.
video part works well with a 3m HDMI cable + coupler + 1.5m original cable, but there is no touch controller with this configuration. after some measurement, i found the cause of the problem: data wires of USB goes on DDC/CEC GND 17 and TMDS D0 Shield 8. on a normal cable, they are grounded to shielding of the cable > when You connect the long cable with coupler, Your data lines will be grounded too
cut the plastic on both side of long cable and rewire it: disconnect the cable on both side from CEC Control 13 and reserved line 14, then connect them to pin 17 and 8. they are not required during operation of lilliput and now the touchscreen works well with extended long cable!
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