Look, the "motherboard" is simply referred to as the NAND here, even though the NAND is part of the motherboard. So I am seeing that you probably have CFW because you bricked, that sucks, I had a problem like that but thanks to my best friend, the NAND backup, I fixed it. I wouldn't recommend replacing the NAND yourself but instead take it to a shop that doesnt care if you have CFW or not and do the replacement regardless.
And also as said above, stay aware of IPS and TN display, because that can have an effect on the restored product. Also make sure you wipe your SD card clean if you do replace the NAND, because then you will have better success at not having a worse scenario when you boot it up with the new NAND, and you can just start over from scratch.