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Topic: A750 Samsung blackouts 7-10 Secs. all the time!
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Joined: Jul 30, 2008
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I have a Samsung 46” A750. I also have Time-Warner Cable with DVR service. I also have a Yamaha RX-V665 AVR.

I have One HDMI cable from the TV (mounted on wall) connected to my Yamaha AVR, and everything else is connected to the AVR, like the Cable, Sony BluRay, Another CD/DVD player that I use for playing MP3’s and regular Audio CD’s, a VCR is also connected to the AVR.

I contacted SAMSUNG because I have been getting blackouts on the TV with the sound still on that lasts for about 7 -10 seconds.

Samsung told me if I use the Samsung remote while it’s in this “BLACK MODE”, and try the volume, tools, and menu on the remote, and you can work these features, then chances are it’s NOT the TV, but maybe the Cable.

Does anyone else experience these temporary blackouts on their Samsung TV’s? And if you fixed this problem, what were the reasons?

One thing I have not done yet, was to bypass the Yamaha AVR and connect from TV directly to the Cable box,but I wanted to see first, what else the problem could be.

Thank you!
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Joined: Mar 28, 2005
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If it is only a HDMI connection to the TV, then it sounds like a HDCP issue with the HDMI connectivity.

I would try a direct feed from cable box to the TV with HDMI and use digital audio from the cable box to the receiver.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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AV_Integrated,
I doubt if you remember me, but I'm still having those black outs from TV.

I bought a Yamaha RX-V665 Receiver (3-31-2009) to play alongside my Samsung LN46A750 R1F/XZA HDTV, purchased OCT. 18, 2008. We have Time-Warner Cable service with a DCH3416 Motorola Digital Video Recorder STB.
For a little over a year with this Samsung TV, I have been experiencing blackouts from the TV averaging about 6 times per hour, and lasting about 7-10 seconds, at any given time of day or night. This does not happen when playing a BluRay or watching ON DEMAND movies. When it blacks out, I only get the audio, but no picture at all!

This is the way I hooked this up- ALL HDMI connections, and ALL going into the Yamaha receiver. I've contacted Motorola maker of the STB, they told me Time-Warner installs their own software into these boxes, I’ve talked to TW, and after replacing cables under house twice, exchanged about 5 boxes and about 6 service calls, they have never heard of this problem, and each time the signal was all 100% feed.

I called Time-Warner, Motorola, Yamaha and Samsung last year and talked to each of their customer tech support and they all pretty much told me they have never heard of this problem. So now I’m stuck in the middle of a blame game. Seriously?

*** Today, a Time-Warner technician came over to check box again, 100% signal, so he suggested we take the Yamaha receiver out of the equation by bypassing the receiver and ONLY connecting the TW Cable out from STB, into the side HDMI IN4 Input to see if that would cause the blackouts as well. (I usually have the HDMI 12’ inside (wall-rated) usually connected to the receiver’s HDMI 1 on the TV rear.
That was around 8:30 AM this morning and it’s now 7:40 PM, and has not ever blacked out since we connected this way! I do not have a TOS Optical Audio,(not needed,just use the TV speakers for now)

The tech did mention something about a 3' fiber optic SPDIF from receiver to Cable box..? How is that going to help the video from blacking out?

I had contacted Samsung back in June of 2009. They had me do a few troubleshooting things to prove it was not the TV.

Do you have any suggestions on what is causing these blackouts, and do you still think it's a possible handshake issue with the absence of a HDCP Repeater either from the Samsung TV or the Time Warner Motorola DVR box causing the VIDEO to go out and the AUDIO to remain on?


Thanks you for any help!
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Motorola cable boxes have significant HDCP issues and it is almost always the firmware of the cable box which causes issue. But, HDCP is a very complex set of keys and handoffs which allow video to be passed from one device to the next.

This is why, in my original response, I suggested that you bypass everything and simple connect the HDMI cable box directly to the TV via HDMI.

Now that you have done this, it further suggests that there is a HDMI/HDCP handshaking issue somewhere along the chain. Where is it? NO IDEA! Nobody knows, and they won't be helpful, and you can't fix it. Annoyed? Well, it's part of the joy of HDCP with HDMI and it isn't going away, but will continue to exist.

The plus is that with cable TV you can just connect the HDMI directly from your cable TV box to your TV and to get surround sound into your A/V receiver, you connect the digital audio out of your cable box into the digital audio input of your A/V receiver. You are SPLITTING the audio and video signals separately. Sending video directly to the TV, and digital surround sound to your receiver.

If I were to guess, the issue is with the cable box. The issue is not hardware related, but software related, so changing hardware won't fix the issue. The issue exists between the cable box and the Yamaha receiver, so the Yamaha may have some firmware issues as well which are realized when the Motorola is in use.

The reason you hear audio, but no video is because your Yamaha receiver is handling everything. The Yamaha pulls the audio off the HDMI cable from the cable TV box, and passes the video feed onto the television. So, audio and video are always there, but need to be authenticated/decrypted via HDCP over HDMI. Bottom line, audio can be treated separately from video. You aren't getting a drop in the digital signal, but a loss of authentication. The Yamaha in the mix significantly complicates this chain of events.

Cable box to TV = 1 key - 1 connection
AUDIO: Cable box to Yamaha = 1 key - 1 connection
VIDEO: Cable box to Yamaha to TV = 2 keys - 2 connections

So, you see that there is a far greater chance for video to fail due to the keys required for the video vs. the keys required for audio.

If you have a follow up question, feel free to ask.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.