I recall, back in the day, we had video cards on the Amiga with a passthrough port.
The Amiga could output stock NTSC/Pal and some close variants, and many monitors existed which could handle that lower scan frequency (15khz), as well as higher res output with Picasso cards.
The Amiga could output stock NTSC/Pal and some close variants, and many monitors existed which could handle that lower scan frequency (15khz), as well as higher res output with Picasso cards.
https://bigbookofamigahardware.com/bboah/product.aspx?id=466
Anyhow, we always tested new monitors before selling them. Monitors which could handle 15khz and higher frequencies too, were expensive and rare.
Often customers would plug in a cheaper, standard PC monitor, and so we wanted to offer those too.
We plugged in one such, and when the switch came to 15khz? It exploded. Like, the magic grey smoke escaped, along with flames and melting plastic.
Every other monitor brand we tested just went blank screen, or reported "out of sync" on the display.
In as customers might accidentally leave passthrough on/setup, we figured selling this monitor to them to be a mistake.
So if it can happen with too low of a frequncy, surely crappy monitors also exist which blow when too high a frequency is passed.
But that's just terrible, crappy hardware.