Screen not turning on after water damage

Unfortunately I dropped my phone into a toilet. I recovered it quickly and opened it up and removed the motherboard and dried it out. The battery was damaged so i bought a replacement. Unfortunately I broke the fingerprint Cable when removing the lid.

I've reassembled the device but the screen is not displaying anything. The device is charging as the red light appears. The capacitive buttons also light and the volume buttons make a sound but the screen is showing nothing.

Anyone have any ideas?

Thanks in advance.

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