Switch Oled no picture after failed mod install (works when docked)

and another mystery case. Switch Oled came with no picture after mod install. So i’ve found customer mixed RST and CPU pins and possibly tried to boot… I’ve removed modchip, Switch will boot, works when docked but no picture on screen. Check with different screen, not screen issue, neither screen connector (tested pin by pin and looks totaly fine). Anyone can point me on the way? thanks