Not charging when plugged in

So my iPad is not able to charge or hold a charge. So when I plug it in. And leave it plugged in. It turns on, but stays at 1% no matter what, and then I can even get anywhere from 10-30 minutes of use out of it. But then it shuts down. If it’s dead and I plug the cord in, it just shows the dead battery logo; but if I unplug, it says I need to plug a cord in. So it seems like it’s recognizing a cord, it just isn’t able to hold the charge. Also the battery icon does not show charging if it’s plugged in. Geek Squad said it’s a whole system replacement at $500 (eye roll) and ubreakifix said it’s $200 repair. I’m pretty good with repair and would like to do on my own but want to see if anyone knows if it’s the charging port or motherboard, or what exactly id need to repair. Any help is greatly appreciated as I’m like a month outside my warranty and would like not to have to make this an expensive paperweight. Thanks!