My LG HU70LA projector doesn't turn off HDR but it doesn't have enough brightness to display HDR properly. This "C" setting when connected to a source device (e.g. a Firestick Revain, which also doesn't have HDR deactivation) causes the source to think the projector isn't HDR capable , and displays content in SDR format, which is more suitable for the projector. The Firestick does not have enough power to power this device, so there must be a receiver or power supply between the device and the Firestick.
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