Hi MacNerd01. LCD issues such as no touch response or lines across the screen are 99% of the time issues with the lcd or the flex cables that connect to the logic board. Try re-seating the flex cable connections to the lcd and try booting up the phone again. If the connections are solid, then there is a chance that there is a micro-tear in one of the cables, in which case you would need to replace the screen. If the home button doesn't work, check the connections again (the SE is notoriously hard to get the cable back reseated with the screen halfway open, but just take your time). If the connection is good, it is possible that the small IC (internal circuit) on the home button was damaged, or the actual flex cable has a micro tear, in which case you would need to get a new home button part.

Hi Quinn. The iPhone SE 2020 has two network antenna cables that connect to the logic board. One of these antennae is housed in the replacement flex cable that is used to replace a lighting port. It is possible that this cable is damaged, defective, or not properly connected to the logic board during the repair. Check out Step 27 of this guide. If you did the repair yourself, I would make sure the connection is solid and the flex cable is not torn. If you took your phone somewhere to get the port replaced, I would return there to get it check out and fixed again! Alex

Hi Alexa. Any time an iPhone won't boot it is most likely the cause of a dead or broken battery. In your case, if the phone became hot, the battery could have overheated and died. If you have the expertise, I would try replacing the battery to see if it can boot up. Afterwards, if it is not an issue with a dead battery, it is possible that there is an IC (internal circuit) short or issue, in which case you should probably take your phone to a repair shop to get it checked out. -Alex

Hi Josh. Generally, there is no easy way to transfer the flex cables from screen to screen at home, so you will need to get a new replacement screen. This is probably best asked to the returns department of iFixit at support@ifixit.com (if you bought a screen kit through iFixit) to see if they can help you get a replacement. Alex