How do I enable 4K output on my Samsung UN43JU640D with a Roku 4K device?
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MellowPine27
I have a Samsung UN43JU640D television and recently connected a Roku streaming device that supports 4K. During setup, the Roku reported that the TV was configured for 1080p and suggested changing it to 4K. I've read that this Samsung model is a 2015 UHD television, but I can't find the HDMI UHD Color option described in setup guides under Menu > Picture > Picture Options. How can I confirm the TV's resolution and enable 4K output?
Answers
Roku’s setup screen can report 1080p if the HDMI connection, selected input, cable, or TV setting prevents a 4K handshake. Try another HDMI input and cable, power-cycle both devices, then run the Roku display-type check again. Also remember that ordinary HD video will still display at 1080p; you need a 4K title or app to verify the higher resolution.
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First confirm the exact Roku model, since only certain Roku players and sticks support 4K. If it is a 4K model, connect it directly to the TV with a suitable HDMI cable and check the Roku display settings again. The TV will only show 4K when the source and the content are both 4K.
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The Samsung model number is important here: the UN43JU640D is advertised as a 4K UHD television, but 4K is a resolution, not a picture mode or color setting. The HDMI UHD Color option is mainly for enabling enhanced HDMI bandwidth and HDR-compatible signals, so its absence does not automatically mean the panel is only 1080p. Try checking the settings while the Roku input is selected, and look under the TV’s external-input or device-management settings as well as the Picture menu.
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