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Why does freerun mode work on certain displays but not others?

Question asked by im_high_tech on Sep 21, 2015
Latest reply on Sep 22, 2015 by mattp

I have designed a system that has freerun mode enabled and have discovered a small bug. When using an older 1080p Samsung monitor, I am able to have freerun mode (blue screen at 480i) run perfectly each time. But when connected to my 4k Vizio TV, I cannot get freerun to work. The display just states there is no signal.


1080p Samsung TV

Free run works

4K Vizio TV

Free run does not work



I though freerun is just a signal generated within my analog chip and put out as a video source onto my HDMI TX? Is this not the case? or what do certain displays do differently?