For questions about component-level electronic circuits, tools and equipment.
1: Be nice.
2: Be on-topic (eg: Electronic, not electrical).
3: No commercial stuff, buying, selling or valuations.
4: Be safe.
I was servicing an arcade game room at a campground, and had a Cruis'n USA in which the picture looked a bit dim. I take the back panel off of the game, and see a 2cm hole burned through the Sharp Image monitor's chassis (circuit board) where there presumably used to be a resistor. It was still working, nobody complained about smoke or a smell?!
This is called an LER. Light Emitting Resistor.
Heat a material and it will emit light in wavelength corresponding to the heat https://en.wikipedia.org/wiki/Black_body.