My tablet will not turn on after some DIY repairs

My tablet had screen flickering issues and after some research, I decided to unplug the battery and reconnect. Little did I know that the battery connector on the motherboard breaks off super easy. So then my only option was to re-solder the pins to the connectors, which I did but it still won't turn on. Some of the connectors won't accept the solder so I super-glued them, but still nothing. Any advice would be great, I called UbreakIfix and they said the base cost of repair would be over $300, which I cannot afford. Should I call Samsung? Thank you for any help.