Has anyone fried a monitor from overdriving it?

[Popcorrin]

The subject line pretty much says it all.
I was just curious if anyone has ever ruined there monitor from sending the wrong signal to it?  For instance, sending a vga signal to a cga monitor?  I have done this on a couple of monitors and I have never had a problem with it.  I have a read before that this will ruin your monitor but I have yet to hear of someone doing so.

[grantspain]

i know if you feed a 15k with 31k it will kill the horizontal deflection transistor as the transistor is working overtime with the higher frequency

[richms]

It will really depend if the PLL on the monitor will lock with the signal coming into it. I know that TVs are set up in a way that they wont lock if its too far off the freq it supports because of what happens when you get noise coming in (snowey picture)  but arcade monitors will not be subjected to this so the upper and lower limits of the hsync oscillator may be outside what the rest of it can do. It would be a stupid design to do that, but you never know.

[Popcorrin]

i know if you feed a 15k with 31k it will kill the horizontal deflection transistor as the transistor is working overtime with the higher frequency

I have heard this before but I have yet to hear of it actually happening to someone.  I personally have sent a vga signal to cga monitors with no ill side effects.

[SirPeale]

All I've ever seen happen is the image is doubled onscreen.