If you have sound, and no picture, then I'd start with only the t-con.
It's a bit pricey, but if it is the correct model number it will work? Do you have an exact part number for the new part? It has to be exactly BN96-28858A/BN96-25509A and V390HJ4-CE1 written on the board or it will not be compatible with version PF03.
Even then....versions are not exact. I suggest opening the TV and confirming your board numbers before ordering. Did you confirm it was the correct part numbers first? Ordering the wrong parts will cost you a lot, and possibly the TV...
Usually, removing the TCON is rather easy. The two clips are simply flipped upwards, and then slided out. The other single connector to the main board has to be held even on each side to press on the locks, and pulled out. You can find videos for this on internet.
But first, please open your TV and confirm you have those parts to begin with. ^^; Samsung has around 4 different panels and main boards for your model.