PS4 "Blue light of death" what causes it and how to find defects.

In this quick video i show a cool and cheap method to inspect and identify solder defects in the outer edges of the  PS4 Apu, common cause of the "blue light of death"

Here are some pics from the bga inspection and reball process..

You can get an optical prism from here - optical prism
and i used this to mount my cell phone onto my microscope Gosky universal mount