Touchscreen not working. Motherboard problem.

Hi I have an Honor 8 Frd-l09. The touch screen isn't responsive at all. I have just installed a new digitiser which has been tested and works well. So I've determined there is an issue with the motherboard. Does anyone know what I need to be looking for to check/fix the touchscreen element on the motherboard.? Any help greatly appreciated.

Thanks.

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