Pixel 3 dead, what will fix it?

My Pixel 3 is completely dead. No light, no vibration, no reaction to any button presses. If I put it on a wireless charger, the charger recognizes it, but then stops charging immediately. If I plug it into a USB-C power meter, it recognizes it's connected but doesn't charge. If I connect it to a computer, it doesn't list it as a newly connected USB device.

I noticed the battery was bulging, so I replaced that with the ifixit replacement. It still is dead.

So I'm wondering what might account for these failures? A bad replacement battery? A bad charging port? A bad motherboard? A cabling issue?