What is the type of solder used in a playstation 3 (PS3)? And its melting temperature?
Lead-free solder, most likely.  I would expect melting temperature somewhere between 210°C and 230°C.  As @Ignacio and @Majenko have mentioned in the comment, the ground planes in the PCB are acting as heat sinks.  A common way to address this is to pre-heat the whole board.  Of course, you have to be careful and avoid pre-heating so much that other components (BGAs, most notably) come off.  See this article for some details.

Here's another useful trick.  Leaded solder has a lower melting point around 190°C.  You can lower the melting point of the lead-free solder joint by mixing leaded solder to it in situ.