How to find out the heated IC's or CMOS in a circuit automatically.
It really depends on your funds, but a FLIR handheld camera, or the FLIR iPhone case does the trick really well. I think the FLIR One iPhone case is under $300. Alternatively, an infrared no-contact thermometer could work as well. Good thing about the FLIR systems, is you can point it at a board and not only see what's hot, but live temperature changes at the same time.