Picture on new TV

It does sound like an HDMI problem - The TV produces an HDCP signal that says it is not a recording device. If the STB does not see that signal it shuts of the video.

There are a number of things you can play with to see if you can make it work.. But, the sure fire fix is to change to component cables. Does your TV have component input?

Samsung may come up with a sftware update to make it work if they get a lot of complaints.

It only has HDMI connections.  Thanks for the suggestion

I was afraid of that Here's what to try with the HDMI -

Try every HDMI port.

Try a shorter cable. How long is the one you have? get the shortest you can at monoprice.com.

The u-verse remote turns on the STB first. Try turning on the TV first. Turn on the TV with the TV remote. Then turn on the STB with the OK button.

If that works, the remote can be programmed - att/ok-977-TV-att-enter. If you need more delay att/ok-977-TV-DVR-AUX-att-enter.

I belive there are composite to HDMI converters. If these other things do not work & you want to try a converter, I will look it up.

Here is component to HDMI - https://sewelldirect.com/Midas---Component-to-HDMI-Mini-Converter-with-Upscaling-technology.asp

While I was looking that up I was reminded of an HDMI splitter that may provide a stronger HDCP signal to u-verse if placed close to the TV - https://sewelldirect.com/Sewell-HDMI-1x2-Splitter-v13b.asp?ad_source=GoogleAdWords&ad_medium=PPC&ad_term=HDMI%20+splitter&ad_campaign=53983803&ad_group=2074889043&ad_network=search&ad_creative=7153161963&gclid=CKe_ir2ii6gCFUiK4AoduEbyCQ

I just went to the Samsung web site and brought up the specifications  manual for the Samsung 4kUHD.  You didn't say which one you have but the spec sheet indicates that this series of TV should have 4 HDMI ports and at least ONE component input set.  So the advice to switch to compnent is a good one.  There are some of us who believe we get better black rendition with component connections than we do with HDMI.  So picture should be just as sharp......perhaps better....with component connection.  A component cable with three conductors will have red, blue & green colored connectors on each end.  Sometimes a 4th conductor for audio is included in the bundle.  Sometimes the audio cable is separate.

FYI there have been off and on problems with Samsung HDMI compatibility regarding industry standards.  You are not, by any means, the first person to have these headaches

Phil.

Connect another HDMI device  (Roku, DVD) to the Samsung and see if the problem goes away.   At least you will be able to prove whether the problem is in the Samsung TV or the Uverse receiver.

Mitch, That logic is a great idea for most cases (ususally one direction connection), but not HDMI. Because HDMI is a two way interface seperately designed to a standard specification.

Each mfgr developed their side to the standard. Some are compatible & some are not. Some have a wide window & some have a narrow  window. The two windows must overlap to work.

You can see some of the factors involved in post 4 that may move one window just enough to overlap the other.

The choice is to try those things or eliminate it altogether & use component. which has a bad rap. Component is fine, maybe even better than HDMI, for u-verse.