Battery problem and digitizer partially dead

The other day, the bottom part of the digitizer started to stop working then two days later, the iphone shut itself down for no reason and won’t charge anymore.

The iPhone can boot with charger pluged in but battery is not charging.

Also, the battery status page in settings is saying that it needs to be replaced and don’t show any percentage of the battery life.

2 days before this battery problem, i checked it’s battery life and it was at 84%.

I don’t think it’s a charging port problem. And battery don’t looks swollen.

Sounds like a motherboard problem ? Or maybe battery is not well connected ?

The iPhone has never been opened, so battery is original.

Need some help and don’t wanna go to Apple Store for repair.