I have a new Vizio P652UI-B2 TV. I noticed my new MK808B + only works on HDMI port 5 which says satellite on my TV. It will not work in any other HDMI port. (The device will launch and when the menu comes up, screen goes blank and says no signal). However, it will work on my 6yr old Polaroid 15 inch HD and my Samsung 32 inch HD. Vizio ask me to find out what Hz the device runs on because they are saying the fact that it works in port 5 which is 60Hz and the other ports are 30Hz means the lower Hz does not recognize the device when the menu launches. That makes no sense to me since my other TVs are standard ports and work fine no issue. Any advice is appreciated.
Hi Lapu209, we don't have a MK808B as a internal testing devices, so I can only guess the at the cause of your issues. I believe that MK808B only support 60hz at 1080p (I am assuming that this is the resolution output for MK808B). I think the problem is that the TV is 4k, and 4K resolution over HDMI 1.4 is only 30hz (at-least until HDMI 2.0 comes out). So I believe that Vizio in order to support 4K input on as many HDMI port as possible, made HDMI port 1-4 30hz only port, to support 4k, and left port 5 as standard 1080p60 port to support none 4k devices.
With that in mind, I believe this is actually a issues of the MK808B hardware, since most HDMI 1080p output devices are suppose to support both 1080p30 and 1080p60 resolution. But it seem that MK808B want to support 1080p60 only. Strange decision, but is probably a cost saving measure.
So working with 4k is actually a very weird thing right now (because of HDMI 1.4). Usually when user attached a video device to a TV (for example blueray player to a TV), the two devices will automatically negotiate the best display settings. Display setting involves 2 things: resolution and refresh rate.
Interesting things is that how that negotiation is done is actually undefined in the HDMI spec.
For example what is best setting for user?
4k@30hz or 1080p@60hz or 1080p@120hz (which some blueray player support)
For movies watching, I think most people would agree that 4k@30 is probably the setting they would want For playing games, for most users, 1080p@60 would be better, in term of getting the best frame-rate from the graphic card of their devices and also smooth game playing on the TV. For live sport broadcasts, some would argue 1080p@120hz is the best for smooth motion.
So as you can see, there is really no best one setting fit all solution, and some output devices might prioritize frame-rate over resolution, picking 1080p@60/120 over 4k@30. So my guess is that Vizio TV, by forcing 30hz on all 4k port will force the input devices to output 4k, if it is supported.
However with all that said, this is just my educated guess based on my knowledge of HDMI spec. So there is a chance that I could be completely off base as well.