Modifing a generic tablet

hi frist time poster here,

i wanted to know if it’s could be possible to modify a tablet power input ( which is a round ac power apadter socket) to the usb-port on it, because i can’t find an other power adpater and i think the socket could be broken too.
i just want the tablet to turn on not charge it, ( i’m willing to have the battery removed if it’s help)

thank you