Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
Does this happen with any other inputs?Even with a 4k player, it needs to be a 4k UHD bluray disc to truly be outputting 4k.
Do you have any other content you can test like a roku4k, fire tv or a 4k dish network box?
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Both ports should accept a 4k signal, but try switching to the other port.
If that does not work you need to look in the settings of the player, because the projector is only accepting the content being sent. this is not a setting on the projector itself.
Actually there is a bigger issue here, my apologies I had initially misread your model. This is one of the older (2012) model JVC projectors, and while it is advertised as having "4k shift" technology, it is not truly a 4k display.
It is only capable of hdmi1.4 and cannot accept a 4k signal.It can only accept up to 1080p, and it does some internal processing and upscaling to simulate a higher quality picture, but it is not a true 4k display.
If that is what you wanted, I'd suggest returning this and I can recommend a different model for you that will have native full 4k support.
My apologies for the news,
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