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Hi! I bought the headset with the whole kit second handed.. I was told I had to change the tether cable wich I did right out of the bat but display still is showing vertical pixels ray.. It moves and changes from image to images.. Not fixed pixels being the problem but seems display or mother board… What should I change or test first?

@jfooo the lack of schematics etc. and looking at your posted image, would lead me to replace the affected eye tube. Use this guide Valve Index Headset Eye Tube Replacement - iFixit Repair Guide to do so. It is difficult to repair something (like the motherboard) that we do not have schematics for. Give a new eye tube a try.