The blanking is loss of sync on the HDMI connection. Common causes are using bad HDMI cables, bad HDMI adapters, the HDMI connector (the DRM device in the kernel) being forced to output using a mode that's outside the display device specs (can happen when EDID data is incorrect or has been incorrectly fiddled with), or the hardware being rubbish, and inadequate power supplies.
In general I would set this:
- Force the initial DRM state (as above)
- Set the Kodi desktop to 50Hz
- Set 'adjust-refresh' in playback options
- Enable the whitelist and only select 50/60Hz 1080p resolutions
- Enable rate doubling and 3:2 pulldown
No idea if that will work though. In general I've always found monitors to be a bit rubbish compared to a proper TV.