14.32Khz (or 15Khz rounded up) is essentially the same NTSC/PAL rate signal that the Amiga original chipset sends out all it's resolution modes in. An LCD TV that supports a 15Khz VGA mode may be possible because analog TV is usually at that same rate..
Most LCD TVs and monitors can adapt to different rates or be programmed for them. However I suspect the message is there because it isn't programmed for the rate, even though it's able to do it..
Most LCD Monitors are set for 28 Khz or Higher (those that are not tv's) because most modern VGA cards did resolutions from 28-31 (640x480 to 800x600). The original Amiga chips weren't designed at all to handle those frequencies and worked with the rate that the original PC RGB (pre-VGA monitors) did for CGA (but analog instead of digital for more colors, which was the same resolution).
I'd check with the manufacturer to see if you can program rates. I know my monitors from Olevia-Syntax are programmable.
