Far from being the toy I feared, I just used the discounted Flie One gen 1 I bought a couple of weeks ago to debug a board.
There was a short somewhere on a DC-DC 9V to 15V 1.5A SMPS. After checking the "obvious" parts like mosfets and schottkys with a multimeter in circuit, I drew a blank. Light bulb in head says, time to use that Flir thingy.
I used a bench PSU, current limited to about 300mA. Switched the bench supply on, a ceramic cap on the back of the board lit up like a Christmas tree. 300mA was probably more than enough.
Closer inspection under the microscope showed a hairline clack in the cap, a 1206 10uF 35V job, luckily I had a spare in stock, I don't usually stock ceramics at that kind of value at that voltage.
The parallax error between the Lapton and video cameras is an annoyance, but I just prodded my finger into shot to locate the offending part.
The only problem now is to remember that I have the device when something like this comes up again.