If you want to buy a replacement screen, screwdrivers and other parts, you can order from us
here -
Nokia 3110 Classic LCD screen
Tools required for disassembly: Torx 6 screwdriver
Remove the battery, back cover and your memory card.

Now remove the front cover by running your fingernail around
the join.

Your phone should now be in two parts, like below. Remove the six
screws you can see.

Now lift the circuit board from the chassis of the phone.

Turn the circuit board over. You now need to remove the small metal
box, indicated by the screwdriver, which covers the connector from the
LCD screen. Pry it away with your fingernail.

You should now have this metal part removed allowing access to the
ribbon connector.

Turn the circuit board over again and lift the metal frame, which
holds the LCD screen, away from the phone, allowing you to unplug the
connector. It attaches like a plug and socket. Simply lift it upwards to
unplug it.

You should now have the metal frame and LCD screen removed.

Now lever apart the edges of the metal frame to release the LCD. You
can now replace the LCD screen with new. Reverse the whole procedure for
reassembly. If you've found this disassembly guide useful, please support formymobile.co.uk and order the tools and parts you need from our site. We ship worldwide!
If you have any questions about how to take apart and repair your broken Nokia 3110, email
rob.lee@formymobile.co.uk. Or post a comment below for further help with
Nokia 3110 disassembly.
If you want to buy a replacement screen, screwdrivers and other parts, you can order from us
here -
Nokia 3110 Classic LCD screen