“What is the main different between 55L621U vs 55L711U18 ? Looks like 55L621U is an older model but it has better sound (12W) compare to the new one. thx”
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The major difference is that with the older model (55L621U) it doesn't have HDMI hdcp 2.2 inputs which is actually quite significant, if you want to view 4k content. The Chromecast built into either model of this tv is not 4k ready. It is the older version of chromecast, which gives 1080p resolution. In order to view 4k content you would have to attach a 4k capable streaming device such as a Chromecast ultra, to the HDMI input. The input must be HDMI hdcp 2.2 ready in order for the content to be viewed in 4k, or it will be downgraded to 1080p. HDCP 2.2 stands for high bandwidth digital content protection. Every link in your video chain must support HDCP 2.2, that includes your TV, video source, and any component the video signal passes through, in order for the video on the tv to be displayed in 4K resolution. HDCP 2.2 is a technology designed to prevent illegal copying of 4K Ultra HD content, and if it's not detected on your video feed the image will be downgraded to 1080p. The older model does not have HDMI hdcp 2.2 inputs, while the newer model the 55L711U18 does. What does this mean? With the newer model every link in your video chain will support 4k content, and if you attach a 4k ready streaming device, you will be able to watch videos at 4k resolution. If you use the built in Chromecast you will only get 1080p. With the older model if you use the built in Chromecast you only get 1080p resolution. If you attach a 4k ready device such as a Chromecast ultra, there will still be a link in the chain that doesn't support 4k content, namely the HDMI input, because it is not HDMI hdcp 2.2. So your last image will be displayed in 1080p. So although the television has 4x the number of pixels as a HDTV, you ll never be able to utilise them to see an image at that resolution. In addition, contrary to what is stated on best buy's website, the older model does not have Bluetooth. None of the 2 models have Bluetooth, so I personally can't see any advantage in buying the older model apart from the lower price.
Sorry, there was a problem. Please try again later.This above answer is incorrect. This TV's Chromecast DOES cast 4k content.
Sorry, there was a problem. Please try again later.better sound
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