I have had this same problem for many months, and wasted many days trying to fix it. FINALLY SOLVED TODAY!! See full description of the problem, simple solution, and outcomes -- here: https://www.tenforums.com/tutorials/95574-change-maximum-processor-frequency-windows-10-a-post2354065.html#post2354065

Your screen cable is damage where it passes through the hinge (the one on the left side). Replacement cables are available, but it may take some looking. I ordered mine from NewEgg. You can also find some new or used on Ebay (and some new ones come direct from China). There is a pair of how-to video...