[Colin] uses a microscope to do some inspection of the board, although the BGA could have concealed faults that would be hard to spot. At the end of the video, he did find a short (but not on the ...

However, for many people, ball grid array (BGA) is still intimidating. Have a look at [VoltLog’s] video about his techniques for soldering BGA and inspecting that you managed to do it right.