Question Getting white speckles with HDMI 4k

mr.black79

Active Member
With a Monoprice premium certified 4k between LG C9 and Panasonic 820 I had white speckles on playing John Wick 3. After swapping it for a Kenable premium certified HDMI the problem seemed to disappear. However while trying to watch Mission Impossible Fallout the speckles returned. On pressing stop and returning to the Panasonic splash screen there was quite a lot of them. The main home screen is normal and I haven't noticed speckles on any other Movies.

I'm hoping the player itself is not faulty, can anyone recommend HDMI cables? I'd like to have some confidence they'll do the job and not waste more time and money. My Cableson v1.4 HDMI were great for many years, but upgrading is proving to be a pain.
 
How long is your cable run? If it is under 25', then a Premium High Speed HDMI cable (with the QR label for authenticity) is about as good as you can get because they are certified by HDMI.org to meet all of the HDMI 2.0 option sets. Make sure you don't have any sharp bends (no sharp 90 degree angles) and that the cable fits snugly in the HDMI ports without any stress on the cable connection. Do you have any other devices you could connect to the C9 using the same cable as a test to rule out the 820? No cable mfr can give you a 100% guarantee that their cable will work in all setups regardless of the product description or marketing so it can be a bit of trial and error.
 

mr.black79

Active Member
How long is your cable run? If it is under 25', then a Premium High Speed HDMI cable (with the QR label for authenticity) is about as good as you can get because they are certified by HDMI.org to meet all of the HDMI 2.0 option sets. Make sure you don't have any sharp bends (no sharp 90 degree angles) and that the cable fits snugly in the HDMI ports without any stress on the cable connection. Do you have any other devices you could connect to the C9 using the same cable as a test to rule out the 820? No cable mfr can give you a 100% guarantee that their cable will work in all setups regardless of the product description or marketing so it can be a bit of trial and error.
The cable is 1m long as the devices are on the middle shelf of my TV stand. I'm careful with not handling the cable too much and making sure the HDMI is firmly fitted. I shall try swapping the cable with my Nvidia Shield TV instead for testing
 
At 1m you shouldn't have any issues at all. Some have suggested that 1m (3') is too short for high speed HDMI but I've used 1m Premium cables before with no issues. In fact I've tested 4' hybrid fiber cables, which are active, with no issues. Let us know how the testing goes.
 

Joe Fernand

Distinguished Member
AVForums Sponsor
Which Input on the TV are you using and are all of the Source devices going via the AVR?

Joe
 

mr.black79

Active Member
Which Input on the TV are you using and are all of the Source devices going via the AVR?

Joe
All devices are connected to the TV with Panasonic UHD Blu-ray player connected to HDMI 3 and Sharc eARC connected to HDMI 2 as I have an older receiver.
 

mr.black79

Active Member
I tested both cables with the Nvidia Shield TV. The Monoprice had white speckles, but the Kenable did not. Next I put the Kenable back in the Panasonic, except connected to TV HDMI 4 this time. Once again the speckles returned, so it can't be the TV HDMI inputs, the Monoprice must be faulty, can't be certain about the Kenable, but it does raise a question about the Panasonic HDMI output.

The Panasonic is on its default settings apart from selecting OLED in it's HDR options and enabling HDR optimiser. The issue only seems to affect DV discs so far
 
Last edited:

mr.black79

Active Member
I reset the Panasonic to it's defaults, disabled HDR 10+ since my LG is not compatible and enabled HDR optimiser for OLED.

In testing DV discs, John Wick 3 and Mission Impossible Fallout there were no white speckles. However when playing The Shining, there were white speckles in between loading screens. The rest of the movie was fine. This is happened once since in between loading screens with John Wick 3 too.
 
Disable the HDR optimiser and see if that makes a difference. I have a C8 and the UBK90 and have no issues whatsoever. Certainly the UBK90 is not in the same class as the UB820 but it does sound like a config issue somewhere. As I said, at 1m just about any High Speed HDMI cable would work, certainly a Premium High Speed HDMI cable, so I don't think it's the cable. It's possible, but doubtful.

Did you bypass the receiver and try a direct connect?
 

mr.black79

Active Member
Disable the HDR optimiser and see if that makes a difference. I have a C8 and the UBK90 and have no issues whatsoever. Certainly the UBK90 is not in the same class as the UB820 but it does sound like a config issue somewhere. As I said, at 1m just about any High Speed HDMI cable would work, certainly a Premium High Speed HDMI cable, so I don't think it's the cable. It's possible, but doubtful.

Did you bypass the receiver and try a direct connect?
Yes I've had to connect directly to the TV because my receiver cannot pass 4k. All 3 devices are connected to the TV and then a Sharc eARC audio extractior is connected to my AVR for HD audio codecs. I'll try without the HDR optimiser enabled to see what happens, this feature is one of the reasons I bought the player. The only other frustration is a slight lip sync delay noticed with the Shining
 
I'd remove the Sharc eARC extractor as well as a test. 4k HDR doesn't do well with devices in-between the source and sink. eARC can be a major pain in the @ss, similar to the issues that still plague CEC today.
 

mr.black79

Active Member
Is your player changing output format when in the loading screens?

Joe
No, not that I can tell, it's during the very brief moment between loading screens, where the whole screen is blank, that I've noticed the issue a couple of times the last few days. The movies have otherwise otherwise been clear in short tests. Spotting a lip sync delay with the Shining is an annoyance I'll tackle later, although I'm not sure the Blu-ray players AV sync delay applies to bitstream
 

Joe Fernand

Distinguished Member
AVForums Sponsor
Tricky one to fault find - Source > 2m Premium High Speed HDMI > Display (all Inputs) would be my test rig.

Joe
 

The latest video from AVForums

Podcast: Home AV, TV, Tech News & Reviews, Plus The Best of July 2020

Trending threads

Top Bottom