Official Optoma UHZ65 Owners Thread - Page 50 - AVS Forum | Home Theater Discussions And Reviews
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post #1471 of 1488 Old 05-07-2019, 04:17 AM
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Originally Posted by Norixone View Post
I am having similar issues with mine and it is at the repair shop. One of the things I am certain of is an issue the way this VPR handles 4:2:2 signals. You get colour banding and wrong gamma. You need to use 4:2:0 or 4:4:4 YCbCr. However, you could still be suffering of clipping like mine is (see photos here https://1drv.ms/f/s!AuZ7yeDscfZZhJoRtguIVKLCQ1uliw). The only way to solve this problem is to set the player's output to RGB and manully set the VPR to RGB16-235. Mine is messing up gamma with DB on and this is the biggest concern I have. I will probably be having it back on Friday, but until then I am not able to say what is wrong with it.
Hello!

So looks that it is a general problem then...Even with 4.2.0 of apple TV 4K, I get still a bit of banding specially in very white background e.g. white cloud sky but your eye has to be trained to see it.
With 4.2.2. of apple TV 4K, the image is almost not watchable...

Let me know the outcome since I am really interested and I might sent mine back too.

The solution to the problem as mentioned is to use 4.4.4. but that is not possible with at least with Apple TV 4K...

What kind of test is this (from your player?) so I can run that at mine UHZ65 too to determine the level of banding?
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post #1472 of 1488 Old 05-08-2019, 11:30 AM
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I have used DVS test patterns for UHD HDR and Spears and Munsil bluray test disc for SDR. I onfirm that 4:2:2 cannot be used from any source, while 4:2:0 gives banding. The only solution is to output in 4:4:4 as @daveh arper suggests or RGB 16-235. Using RGB means that you will also need to re-calibrate and adjust brightness and contrast settings (which should not be the case if the VPR worked correctly).

Notice that with 4:4:4 YCbCr you are still getting clipping as proven by the tests I have linked.
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post #1473 of 1488 Old 05-09-2019, 01:48 AM
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Hello everyone! I am Jacob, I am from Taiwan, Taipei.
A few days ago, a very interesting toy came to my friend's shop;
That is what everyone expects for a long time, Optoma's 4K dual laser projector ZK1050,
Bright 10,000 lumens double laser, what a dreamy number,
I know that many friends on AVS have great expectations for this machine,
In our hands is the BETA version (trial version)
Not the final version
The machine also has some BUGS
But this machine gave the scene everyone a big shock.
Very bright, very gorgeous, very three-dimensional, very sharp,
I can say a mad word,
Haven't seen this machine, don't think how good your 4K projector is;
haven't seen this machine playing 2KBD, you really don't know how great 2KBD is!
You think HDR is very powerful! But in front of this machine, I can only say...
HDR is really nothing great!
(Of course! I have not tried it on MADVR)
It makes the 30K Japanese laser machine look like a ****
(I know a lot of people don't believe it)

I am sorry that my English must be translated from GOOGLE.
But no matter what,
Please be sure to check this machine with your own eyes.
It is the same Base as the Christie 4K10 HS;
If your budget is at 30K, you must check it out.
If the budget is at 20K, you can look at ZK750 and Christie's 4K7HS
The Screen Excellence 206" (16:9) screen is used in the friend store, with a gain of 0.9.
Panasonic UB900
Since it is a Beta version,
Dynamic Black is not turned on
HDR is not turned on
I highly recommend you: if your budget is enough, if you don't have a rainbow eye (Chinese Saying=RBE)
This projector will definitely be the ultimate goal of your life!
I will post some photos to share with you.
CHEERS!!!






























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post #1474 of 1488 Old 05-09-2019, 01:54 AM
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Sorry! I don't know how to upload photos.
You can press the right link on the map.
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post #1475 of 1488 Old 05-09-2019, 03:41 AM
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Quote:
Originally Posted by Norixone View Post
I have used DVS test patterns for UHD HDR and Spears and Munsil bluray test disc for SDR. I onfirm that 4:2:2 cannot be used from any source, while 4:2:0 gives banding. The only solution is to output in 4:4:4 as @daveh arper suggests or RGB 16-235. Using RGB means that you will also need to re-calibrate and adjust brightness and contrast settings (which should not be the case if the VPR worked correctly).

Notice that with 4:4:4 YCbCr you are still getting clipping as proven by the tests I have linked.
Thank you for the information !

I am returning mine to Optoma for repair.

If I am getting a projector that doesn't work with apple TV 4K or has basically problem with the majority of mainstream video sources, that is basically to my opinion a "misleading" product...

If my problem is not fixed I have asked for refund since this is not how the product is advertised.

For sure I cannot select 4.4.4 in apple TV 4K with HDR and for sure it is not acceptable that has also defect on the picture...

This is beta product then and not for market!

I have not yet understood though if all UHZ65s and owners have this problem or it is only my projector...?

I guess all?
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post #1476 of 1488 Old 05-09-2019, 05:19 AM
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I'm after some advice on Dynamic Black with SDR content. Factory settings /cinema mode, just tweaked brightness /contrast to get reference black and white set up properly.

DB3 is unusable as in dark scenes it occasionally turns the laser nearly off, meaning the few bits of light are barely visible and it looks like the projector has broken.

DB2 generally looks very good, but I'm getting a lot of hilight blowout - particularly noticeable on faces which looks really unpleasant. I tried loads of adjustments (including re-adjusting brightness/contrast) but couldn't make it go away (just made things slightly better by playing with sharpness, some of the pure settings etc) until I finally tried DB1.

DB1 finally solved the blowout issue, but obviously isn't as good for contrast as DB2.

Does anyone know a way of solving the hilight blowout problem while staying with DB2? It's the one thing that's in the way of a perfect setup I think!
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post #1477 of 1488 Old 05-10-2019, 07:48 AM
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@thigger first of all I do not htink Cinema is the best mode. You should use the 2.2 setting. The DB influences a lot the gamma correction curve, so you do not want to set the contrast to high (not more than 1 or 2 clicks). To test pause the image you see with blown out white and modify contrast. Remeber to come out of the menu and wait a few seconds as the overlaied manu does effect the way DB interacts. If you see no change, start the film and go back to the point you had issues with and pause.
Unfortunately, this vpr does have some issues I hope the updated firmware solves.
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post #1478 of 1488 Old 05-10-2019, 07:53 AM
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Returning to the clipping issue, it is confirmed and even the firmware up-dates do not address it. There are two processors in the vpr, one that works on the incomming signal and one that uses the converted signal into RGB to drive the diplay. The first processor messes up the signal clipping it. Optoma UK does not seem to be aware of the problem. I hope this escalates so we will know if it is a limit of the hardware or it can be solved through software.
I am now quite sure that all the UHZ65 out there have the problem, but people seem not to have noticed it.
I would invite all owners to check with the appropriate test pattern (SDR or HDR is the same) and to report back. It may become something Optoma will address if they see more people complaining of this behaviour.
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post #1479 of 1488 Old 05-11-2019, 02:19 PM
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Quote:
Originally Posted by Norixone View Post
Returning to the clipping issue, it is confirmed and even the firmware up-dates do not address it. There are two processors in the vpr, one that works on the incomming signal and one that uses the converted signal into RGB to drive the diplay. The first processor messes up the signal clipping it. Optoma UK does not seem to be aware of the problem. I hope this escalates so we will know if it is a limit of the hardware or it can be solved through software.
I am now quite sure that all the UHZ65 out there have the problem, but people seem not to have noticed it.
I would invite all owners to check with the appropriate test pattern (SDR or HDR is the same) and to report back. It may become something Optoma will address if they see more people complaining of this behaviour.
That is a good approach. I am sending back mine on Monday to be fixed in France. If it is not fixed then I would claim my money back from the shop or exchange with another brand. That is too expensive projector for this kind of defect.

That is inexcusable for such price range and I am pretty sure that much cheaper 4K don’t have this problem....

I will return that for a Sony if problem is not addressed.
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post #1480 of 1488 Old 05-12-2019, 01:56 AM
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Originally Posted by Norixone View Post
The DB influences a lot the gamma correction curve, so you do not want to set the contrast to high (not more than 1 or 2 clicks). To test pause the image you see with blown out white and modify contrast.
Irritatingly my player puts up an overlay on pause which makes the DB algorithm behave so the whites look good again!

Digging through this thread I've ended up with gamma 2.4 (my room is pretty dark), contrast -10 and used the CMS to reduce the white brightness to -40. This seems to let me use DB1 on SDR content and DB2 on HDR content, with a tiny amount of blowout (barely noticeable and I'd have to drop the contrast a lot further to get none)

The irritating thing about the DB algorithms is that I can use a clipping test pattern and get no clipping at all, but playing a film still has blowouts.

I've had a look at a couple of the settings in here but not found anything that avoids the problem yet (except for ones with DB turned off) - only lowering the contrast and white brightness massively seems to persuade the algorithm to behave.
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post #1481 of 1488 Old 05-12-2019, 07:34 PM
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Quote:
Originally Posted by thigger View Post
Irritatingly my player puts up an overlay on pause which makes the DB algorithm behave so the whites look good again!

Digging through this thread I've ended up with gamma 2.4 (my room is pretty dark), contrast -10 and used the CMS to reduce the white brightness to -40. This seems to let me use DB1 on SDR content and DB2 on HDR content, with a tiny amount of blowout (barely noticeable and I'd have to drop the contrast a lot further to get none)

The irritating thing about the DB algorithms is that I can use a clipping test pattern and get no clipping at all, but playing a film still has blowouts.

I've had a look at a couple of the settings in here but not found anything that avoids the problem yet (except for ones with DB turned off) - only lowering the contrast and white brightness massively seems to persuade the algorithm to behave.
If you have the Panasonic UB820 or UB9000 UHD player, for disc content see if you can use the gamma sliders to get better DB1 or DB2 control and avoid clipping.
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post #1482 of 1488 Old 05-13-2019, 05:50 AM
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Originally Posted by Aztar35 View Post
If you have the Panasonic UB820 or UB9000 UHD player, for disc content see if you can use the gamma sliders to get better DB1 or DB2 control and avoid clipping.
My player doesn't do any processing - just spits out YUV 4:4:4 - but I think there are options in my AVR - I'll give it a try, thanks.
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post #1483 of 1488 Old 05-13-2019, 08:18 AM
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That is a good approach. I am sending back mine on Monday to be fixed in France. If it is not fixed then I would claim my money back from the shop or exchange with another brand. That is too expensive projector for this kind of defect.

That is inexcusable for such price range and I am pretty sure that much cheaper 4K don’t have this problem....

I will return that for a Sony if problem is not addressed.
Mine is back to Optoma France today. I hope that it is something that can be fixed or something I am doing wrong. I noticed that other people (from the other UHZ65 thread) are having the same problem. For sure it is not working as it should with Apple TV 4K. I get similar problems to your photos attached. Maybe, as you say depending on your video output format, it can be a common problem but in any case I didn’t buy a projector for a very specific video output setting and it shall work with all expected mainstream formats.

I will let you know the outcome and I cross my fingers since I really like this projector. If it is a common problem with all UHZ65s then I will go for the refund option most probably.
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post #1484 of 1488 Old 05-14-2019, 02:31 AM
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Very curious to here what Optoma France says. Optoma UK said it may be that the projector is too close to the screen. I wonder if they have even red the manual. It is possible to lower the laser output. However, even if it were at 1 metre from the screen with zoom fully opened it should be possible to see the various shades of white and colour of the clipping tests. Anyway, it seems that the UHD65 has the same issue and I do not think this clipping problem can be solved.
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post #1485 of 1488 Old 05-16-2019, 01:18 PM
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I’m new to the forum and looking for help accessing the service menus on my UHZ65 so that my automation guy can do a full calibration. According to him he needs access to the menu in order to make the adjustments. Any help would be appreciated.
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post #1486 of 1488 Old 05-16-2019, 02:26 PM
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Originally Posted by Cain57 View Post
I’m new to the forum and looking for help accessing the service menus on my UHZ65 so that my automation guy can do a full calibration. According to him he needs access to the menu in order to make the adjustments. Any help would be appreciated.
Google:

Optoma UHZ65 Service Menu Codes
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post #1487 of 1488 Old 05-16-2019, 11:39 PM
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Thank you! I previously googled for Optoma UHZ65 service menu but couldn’t find it.
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post #1488 of 1488 Old 05-17-2019, 10:55 AM
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Thank you! I previously googled for Optoma UHZ65 service menu but couldn’t find it.
https://www.projection-homecinema.fr...age-1/?page=34
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