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The original was posted on /r/hometheater by /u/sandhanitizer6969 on 2023-09-26 21:04:51+00:00.
Hi everyone.
I would be extremely grateful if anyone could explain why this works and how I can improve the situation.
Situation: Random white flashes and occasional black screens with HDMI repeater and long (25m) cable in place.
Gear: Sony STR-DN1080 receiver. LG OLED 55B8SLC TV
Everything worked fine when I had a short (2m) cable going from the receiver to the TV. No flashes, dropouts and Dolby Vision worked flawlessly.
The problems started when I moved to my new house (was renting before) and mounted the TV on the wall.
TV is on the wall and the rest of my gear (receiver etc) is on the opposite side of the room. To achieve this the installer ran a 20 metre HDMI cable around then wall (along the the other cables I needed).
This wouldn’t work. I could bring up the Sony config menu but that was it. No other devices such as my Apple TV would display an image.
Tried an HDMI repeater ( HDMI Repeater Neoteck 60M 4K... ) - No joy.
Tried an HDMI over Ethernet system ( PW-HT249HK HDMI KVM USB Extender 196ft/60m Transmission over Single Cat5e/6/7 HD 4K@60Hz Support Loop out 3D EDID Function ) - This worked and was stable but no Dolby Vision.
Note: All of the above was using the HDMI A output of the STR-DN1080.
I then purchased a 25m Ruipro optical cable ( RUIPRO 8K Fiber Optic HDMI Cable... )
Now, this didn’t display a image at first. However:
Connected directly to the Apple TV - works perfectly.
Connected to the HDMI B output of the STR-DN1080 - works perfectly
Finally I connected back to the HDMI A output of the Sony but re-used the HDMI repeater from before.
Wahlah! All working. Dolby Vision, ARC, CEC all work.
However I get random white flashes and black screen pauses.
My questions is why does work? AFAIK the only difference between HDMI A and B is B does not have ARC or CEC (which I would like to use l).
Any help would be appreciated.
Thank you.