this is taken from polish console repair service site
As the first service in the world, and thus in Poland made â€‹â€‹the impossible!
proud to present a new gallery showing the full process uBGA heart PS4 console
- an AMD APU Jaguar range of activities:
1 Removing the PS4 console on the European release (date 29.11.2013r.)
2 Removing the APU system based on IPC (CPU & GPU - AMD system Jaguar) from the motherboard
3 Reballing the APU on a new solder alloy Sn63/Pb37 (unfortunately does not have at the moment, sit under a BGA. We made â€‹â€‹all the marbles own - it took 3 hours but byÅ‚on worth it!)
4 Installation of the APU system based on the IPC
5 Installation of the motherboard console PS4
6 The test result of the device ended POSITIVE !
Console after made uBGA and replacing thermal paste to Arctic Silver S runs a lot quieter during long hours of gameplay in KillZone Shadow Fall
site here: http://www.serwis.kielce.pl/galerie.php?d=14&url=test