PS3 PS3 reball with puhui 8280

[dumbass370]

Hello guys
I made myself a BGA soldering station - Puhui 8280 + ACHI6500 top heater
Machine itself works fine, but i already ruined 2 rsx - both had vram bleed no matter what i did, i happens at 200 degrees
Somehow before that i managed to remove another dead 90-nm rsx without an issue
I guess it's the matter of thermal profile, but the control is only manual in this case
What i do:

1. Put a board on a bottom heater
2. Turn bottom heater on, 300 degrees
3. Wait until area close to rsx gets 170-180 degrees
4. Turn on top heater on 260-270 watts (there is no temp control, only power via dimmer)
5. Wait till rsx reaches 230-240 degrees then remove it

Sometimes it works, sometimes i get a dead rsx
As a precaution i put an aluminium foil on cell and nec/tokins
So there is the question, what do i do wrong?

 

[shnyaps]

you need to preheat for 24-48 hours, I think)

 

[dumbass370]

you need to preheat for 24-48 hours, I think)

Will try, ty
Only got 1 good mb left