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Topic: Help with HDR, Projector or Receiver
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Joined: Nov 30, 2020
Posts: 3
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Can someone please help me. I had a 1080p projector setup, but wanted to switch to 4k HDR to watch movies and play games on a PS5.

I just purchased a Viewsonic PX727-4K projector and a Sony STR-DH790 receiver. I connected my Apple TV 4k. After scrolling through some videos on Netflix, I noticed the titles were just reading 4k. I checked the settings on the Apple TV and noticed the video setting was showing 4k HDR 60hz, but the chroma was set to 4:2:0. I tried changing to 4:2:2 but the receiver's HDMI light started to blink with no picture until the picture changed back to 4:2:0. I changed the HDMI Sig. Fmt. on the received to Enhanced, but kept getting the same result. I figured my HDMI cable was only and didn't support the 4:2:2 format (figuring HDR as well), so I bought a new HDMI that supports 18Gbps.

I installed the new HDMI cable, between the receiver and the projector (HDMI 1). When I changed the chroma on the Apple TV 4k to 4:2:2, the picture changed with no issues. After scrolling through Netflix again, I still don't have any of the titles showing HDR, just 4k.

The receiver notes that all inputs support HDCP 2.2, Dolby Vision, HDR 10, and Hybrid Log-Gamma. I'm thinking something is off with the projector.

Please help, as I might need to return something within this time period to resolve it. Thanks.
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Joined: Mar 28, 2005
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I don't have a good answer for you on this really.

I do want to ensure that you have a Netflix plan that specifically supports 4K HDR videos and not just 4K or something similar.

I don't like to send anyone off site, but it is worth asking if you've connected the AppleTV directly to the projector, bypassing your AV receiver completely to see if you have the same issue.

Also worth asking if you can connect the ATV using a short HDMI 2.0 cable to see if that works.

Finally, you may want to ask the same question over at AVS Forum in their specific thread for that projector. That will get you some responses from others who own the exact same projector.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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Joined: Nov 30, 2020
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I tried the new HDMI (25ft) directly from the ATV4k to the projector (HDMI 1). I had to change the chroma format from 4:2:0 to 4:2:2 again. This time, Netflix showed Dolby Vision with no issues.

I ordered a new 3ft HDMI, rated 18Gbps. Going to try that from the ATV4k to the receiver. If that works, then they were both just old and slow HDMIs.

If it doesn't work, then I'm assuming the receiver isn't passing the signal correctly.

I'm thinking the new HDMI cable should do the trick though. Will post when I get another update.
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Joined: Nov 30, 2020
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Changing the 2nd HDMI did the trick. It's now showing Dolby Vision on Netflix, with the ATV4K into the receiver.

Two separate issues I found:

1) The receiver overheated and went into Protect mode after maybe 30 minutes of music on ~Volume 45. Not sure if it just doesn't have the power that I'm looking for. I'm hoping once I do the sound tuning, that should help it perform more efficiently.

2) I had calibrated the zoom and focus correctly, to where the picture sat right into the frame. There is a black velvet border around the scree, maybe 2". I just noticed last night that there is a light ring roughly another 2" outside of the velvet border. The picture is still inside the border, like I calibrated. I calibrated it again, but same thing, there is a light outside of the border. If I were to fit the light on the light absorbing border, the picture would sit several inches into the frame. This wasn't the case with my previous projector, and don't believe I noticed this before, until last night. Only thing I can think of, is if my son pushed a button on the remote by accident that changed it into Bright mode. If that's not it, I'm not sure what can fix that.
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Joined: Mar 28, 2005
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Good to hear that the cables were the solution to your HDR issues. Hopefully you didn't pay to much for them.

As for the light ring...

Not sure that wasn't there the entire time. DLP projectors typically have a bit of a light ring around the projected image due to the nature of the technology. On some DLP chips, this light ring is rather large.

There is not a solution as this is not a 'problem', as much as it is a limitation of the technology.

I know that newer 4K DLP chips actually reduced the light border because the earlier model had a very large light border around the image. I can't tell you which projectors had this issue, but I'm guessing that the model you have is using the older 4K DLP chip and that's the issue.

EDIT: Looking up your projector model, I am sure it is using the first generation 4K DLP chip, which means it has a very large light border around the image.

Does your receiver have plenty of airflow with no equipment on top of it?
What type of speakers are you using (make/model)?
Do you know the Ohm rating of your speakers?

There's nothing obvious that should cause thermal shutdown of the receiver. Especially if it had a lot of room for amplification left in it.
[Edited by AV_Integrated on Dec 3, 2020 at 1:51 PM]
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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