HDMI 10 Mtr Cable and 24" Touch screen

We have been asked to supply 3 Intel NUC and 6 x 24" 10 point touch screen using 10mtr HDMI Cables. Connecting 2 screens to each of the 3 Intel NUC. When testing in the workshops we found the touch screen did not work as a touch screen. We found the only way we could get this to  function was to connect a USB cable to the monitors, this did work. We have now installed at the customers premises but the customer is now saying he is getting drop outs on screens. Here is what he sent us today. "As a matter of note they appear to be worse when two monitors are attached.  With one monitor the problem only happens after a few hours."

We connected two 5mtr extender USB cables to the original supplied USB cable, the HDMI cable is a good quality Gold connector. The HDMI cables are converted from the two outputs on the Intel NUC to a full size HDMU connection.

Any thoughts on why this is happening. We have asked the supplier but seem to be getting no where and they are reacting to slowly with any answer. The monitors are rebadged Samsung screens. We have asked the supply to get a statement from Samsung but they seem reluctant to do his. Would a powered USB hub over come the issue as we believe its a USB power issue.

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John TsioumprisSoftware & Systems EngineerCommented:
Given the fact that the maximum length of USB cable is 5m i guess that a powered USB could be a solution....but given the fact the NUCs is extra small factor PC what is stopping you to transfer them to a shorter distance..... ?
dilesAuthor Commented:
We are aware of the 5mtr rule which is why we used 2 x 5mtr Extenders. The customer is using these in such away we cannot go to a smaller HDMI cable. They are using the NUC in a central position with one screen going to one side of a factory and the same with the other screen. The program they use is basically a time keeping software. This means 2 operators use each screen per pc (Not at the same time) We did not spec out this job the customer gave us a shopping list. Although I did not ask I suspect the software company recommended the hardware spec, maybe not as the USB cables were not on the list. The list was very precise as to what the customer wanted.

John TsioumprisSoftware & Systems EngineerCommented:
Maybe you need a booster not just extender
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dilesAuthor Commented:
Extenders are boosters
John TsioumprisSoftware & Systems EngineerCommented:
I guess you have to check the consumption of your monitor regarding USB power ....if it is near the specs of USB then this could be the culprit....what model is your monitors
dilesAuthor Commented:
Rebadged Samsung 10 point 24" Touch screens. This is the trouble we are having with the supplier, getting this information.
John TsioumprisSoftware & Systems EngineerCommented:
There is a chance that your cables are not of the required quality...have you checked with different cables...
dilesAuthor Commented:
As it happens we had to buy 2 makes of USB cable and both makes are having the same issue, if of course it is the USB cables.  We are on site at present with a powered USB hub to trial. Any other thoughts would be good and I will report back regards the USB hub.

dilesAuthor Commented:
We took a powered USB hub to site but this made no difference I m sorry to say (Very sorry)
Gary CaseRetiredCommented:
The issue isn't the signal strength of the USB cables; it's the total length -- with 5 meters PLUS the original cable you're exceeding the spec, and the timing simply isn't reliable.    There are several ways to provide longer length for USB connections.    Probably the most economical is to use these adapters:

Note that they only work at USB v1.1 speed, but for a simple touch-screen interface that's plenty.
dilesAuthor Commented:
Apologies for the delay. This has now been resolved, it appears that the USB 3.0 cables provided by the manufacturer were the issue, they sent down some USB 2.0 cables and they worked fine for a while then failed. The USB 3.0 cables were reattached and it's been fine ever since.

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dilesAuthor Commented:
Not a solution as such as there was no reason why the original cables supplied didn't originally work. We are unsure why after using USB 2.0 cables that the SB 3.0 cables suddenly worked fine.
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