MacBook not booting showing no lights

Hard to help by undoing a technical mistake at a distance..if anyone had such power I’m pretty sure it wouldn’t be used for such purposes ;) You can check what’s posssibly the problem by shining a light to your screen and plugging it to an external source. If the faint image is still shown on screen it’s probably a backlight issue that can be repaired but requires microsoldering skills and tools. If you have no faint image on screen but it shows fine on tv or monitor the screen has probably gone and needs replaced..yet there is a chance the issue is on the logic board. A DIY approach can’t give you always clear answers unfortunately. Probably the cheapest option would be to find a lab into component level repairs.