Black screen flicker on Sony 55x805e at 4k enhanced mode

by paulraised

Hi, I’m posting here hoping someone else has experienced this and has some new ideas about it. I had a Sony 55x720e TV (non-android) working flawlessly for an entire year, and last week dead pixels came up, so I got a brand new Sony 55x805e with Android 6.5 I believe (terrified of updates that might break even more things). A 25ft CableMatters certified hdmi 2.0b cable is connecting my PC to the TV (could probably make do with 15ft though).

This same cable always worked on hdmi enhanced mode, with the 720e at 4K 60hz RGB full or hdr, but with the new 805e I'm getting black screen flicker / signal drops at random intervals, anything from 20 seconds to 6 minutes.

If I set the hdmi ports 2 & 3 to standard instead of enhanced, the problem goes away but it forces limited output range 15-235 instead of 0-255 full rgb... and no hdr, I've seen similar threads but no one ever has a definitive solution or explanation.

This is only happening to my PC (nvidia 1080ti latest 425.xx drivers for Win10); my ps4 pro sends full rgb and doesn't have the issue. So I don’t think it’s the TV. Unfortunately the ps4 pro hdmi cable is too short to test with the PC.

Could the long hdmi cable have been damaged over time ? everything I see points to the cable being unstable for the bandwidth, but I can't wrap my head around it working flawlessly for an entire year with the first TV if that's the case.

These certified hdmi 2.0b cables are very expensive in my country, so I’d appreciate any ideas or thoughts about this before I burn more money on a new one

Thanks.

xhabeascorpusx

It could be the cable coincidentally broke.

If it's a PS4 Pro could you test it on the longer cable?

What is the Hz set at for your computer?

Did you delete the TV driver after switching TV's?

I don't have too many ideas unfortunately.

paulraised

Updated: I tried looking into the TV driver as mentioned by /u/xhabeascorpusx but found no mention of a Sony specific driver anywhere, just the generic plug and play monitor. I also tried the 25 ft hdmi cable on the ps4 pro and it works, that was also a good idea by /u/xhabeascorpusx

I tried a full removal of nvidia drivers using DDU and it made no difference. Also different clean Win10 install on different hard drive, but no luck at all.

And I got a new certified hdmi cable today, 15 ft instead of 25 but it makes no difference, same flicker at random intervals when using enhanced hdmi mode. I can't really go any shorter than 15 ft at the moment. So I guess it's just my luck of TV+video card+drivers... I'll get used to not having hdr or full range rgb I supose... serves me right for purchasing another Sony after getting screwed with the first one.

raptor75mlt

/r/bravia?

This issue is completely unrelated to AndroidTV. You won't get much help here