Phone showing no signs of life

Bought a destroyed iPhone 13 Pro on eBay as a fun restoration project. There is no water damage, and the logic board is in perfect cosmetic condition, so I replaced the back glass, display, and battery. After all that, the phone shows no signs of life, even after trying all the tricks found online. When a lightning cable is connected, it draws almost no power at all, even though the port has been thoroughly cleaned. On a wireless charger, the charger will react, showing it's sending power, but the phone still won't do anything. Is the logic board toast, or is this fixable?