Temperature for desoldering southbridge

[as2pic]

Hello everyone,
I would like to desolder the southbridge of a PS5 without damaging it. I don't have a preheater, and I have a Quick 861DW hot air blower. Can you tell me how to proceed? What temperature should I set, what airflow, and for how long?
I have already resoldered a southbridge with lead reballing at 440°C and 40 airflow. But I've never desoldered one before. Should I go much higher, like 500°C? Should I do it in stages?
Thank you very much for your help.

 

[jkyoho]

why only 40 airflow, crank it up

 

[as2pic]

Okay, but for desoldering? What temperature?

 

[jkyoho]

When I have pre-heater at 120c board temp, I do it on 350C 100air in 2min.
So I guess you would need gradually increase the temperature from 250C 100 air to 400c 100 air each 100c step every 2min.
FYI, for PS5 Southbridge, bare air gun without nozzle is pretty ideal size unless you have pre-heater and large BGA nozzole(45x45mm nozzile or up)

 

[as2pic]

Thank you very much! And what are the parameters for the Panasonic HDMI chip? Since there is a large thermal step, the temperature is higher, right?