(adsbygoogle = window.adsbygoogle || []).push({}); I have a PHAT 80gb model on 3.55 OFW
i have tried

PS3 Jig
Firmware update
Restore file system
Restore PS3
L2diag.self

Only things left are try heating the board using a hairdryer (i forget the name of the machine) or taking it apart and redoing the thermal paste. Along with using a heatgun.

sure i will try it