Black screen of death?

So I've had this 3DS for years, it was the first system I ever played on and the first game i ever played on it was Ocarina of Time(good memories) But after nearly a decade now i had the issue where it powers up and you can hear the system sound but the screen stays completely off. I've tried all the old tricks like taking out the wifi panel and holding the L-up and A button when powering on. i checked what i believe is the ribbon cable that attaches to the camera, Speaker and top screen all had corrosion. I've cleaned them all and i still have the same issue as before.