Touch screen not working

Hi, Im wondering wether or not change my screen on my d851 (it costs $100 in bolivia). Only option here is changing the entire LCD+touch+front housing. I get this error (see on attached file) on auto touch test under hidden menu.
Does this means that the problem is the touch screen? Or the motherboard?
Im thinking of buying a cheaper phone because of this...
I miss my g3...

Attached Thumbnails

 

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