My phone is not working at all

Yesterday I was browsing internet with my phone then suddenly screen went black.I waited for about 2 minutes but it was still black! (about 70% battery)

Then I pulled out the battery and replaced it and I turned on the phone.Everything was okay for about 1 minute then my phone froze (Nothing was working) and after 10 or 15 seconds, the screen went full purple and after 10 seconds after that, screen went pink!

I pulled out the battery again and put it in again but ((nothing)) worked anymore.I held power button for 5-6 seconds but nothing reacted(No vibration or….)

I guess it’s because of my broken battery charger.My battery charger's wire is broken and sometimes it disconnects and connects again so I guess it damaged motherboard

Any help is greatly appreciated…