Hi!
Sony is using lead-free solder and so the temperature need to be around 400 (some even use 450 to get it to melt!).
I also do need to use a lot of heat to melt the solder (heatgun hits even 500, and it is working fine, didn’t damaged or burned the board).
So, it should be fine. But be sure that you do not hold the tip on the board longer then needed. Just be aware all the time. Just take little steps. You do need patience and be aware of what happens on the board.
Good luck with the repair!!