MB Pro 13 2016 nTB outputs 59Hz NTSC signal through Thunderbolt 3

Hajzenberg

macrumors newbie
Original poster
Jan 9, 2017
16
2
Today I tested HP S240uj USB-C monitor in store. It was connected through USB-C to my MacBook Pro 13 2016 nTB, but it was recognized as TV, and resolution was set to native 2560x1440 but at 59Hz and signal was NTSC.

On darker parts of the screen we could see noticeable jittery vertical scan lines. We connected monitor through DP to the PC in store and everything was fine, no scan lines.

I have Dell monitors at home which are connected through Apple HDMI multiport adapter and are recognized as TVs, but refresh rate is 60Hz and there is no jittering on screen.

So is this some MacBook Pro Thunderbolt 3 problem? Did anyone ecperienced it? Is it fixable with this patch (I used it for my Dells)?
 

casperes1996

macrumors 603
Jan 26, 2014
5,314
3,135
Horsens, Denmark
Don't know about the patch thing, but by the sound of it, the display doesn't accurately inform the Mac about what it is (i.e. the cable used doesn't transport the EDID profile). A lot of cables are shotty and don't follow specs properly, and just assume the computer will do the right thing, but without the EDID profile, it can be tough for the computer to make the right call. I'm not quite sure how Windows makes its assumptions but it's more often than not the only thing tested for, and Macs will more often than not require a proper cable that follow DP specs. Don't know why the Mac expected NTSC however - that's not the usual
 

Hajzenberg

macrumors newbie
Original poster
Jan 9, 2017
16
2
We used the USB-C cable which comes with the monitor. No other way to test it unless I import quality USB-C cable.

Are Belkin and Cable matters reliable?
 

casperes1996

macrumors 603
Jan 26, 2014
5,314
3,135
Horsens, Denmark
We used the USB-C cable which comes with the monitor. No other way to test it unless I import quality USB-C cable.
As sad as it is, screen manufacturers often save on cables and ship non-compliant cables that aren't up to spec.
There are a lot of cables out there that don't comply with the standard. For instance, there's the power over pin 20 problem, and cables not properly transmitting the EDID profile of the display like this problem. I don't know about Belkin, but BlackMagic makes proper cables I know
 
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