Question about Samsung SIR-T451 DirecTV DTV Receiver

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No signal I've been using this receiver for over a year for OTA HD programing. I tried connecting my cable tv line to the receiver and couldn't get a picture to come up. It wouldn't see any channels when I did the automatic memorize function. I then switched it back to the HD antannea and now it won't find any channels through there either. I tried a different coax line in case it happened to go bad durning this switch. The front display on the receiver says C-and the channel number. Is his correct. I don't remember it being a "C" before. Does C mean Cable? I can't figure how to switch it back to Air...

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Re: No signal

Reconnect the antenna and restart the receiver. then go into the menu and a run the initial setup. make sure you dont skip the zip code. it may take a moment to register all the channels

Posted on Jan 04, 2009

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If I connect antenna coax to the tv in on my dish receiver, can I get ota programming on my non-digital signal ready tv with out a stb?

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Sep 01, 2012 | DISH Network ViP722 DTV Receiver /...

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Standard reception is fine but when i go to HD it plays for about 3seconds pauses and continues on this way any ideas..thanks T


This occurs only on HD channels? Is it all HD channels? Have you tried unplugging the receiver from your electrical outlet for 10 seconds? After 10 seconds plug the receiver back in. This will cause the receiver to reboot and re-acquire satellite signal. Also, check your cables on the back of the receiver to make sure all connections are hand tight. If this doesn't fix the problem, we may need to a tech to check your dish alignment for your HD programming. I hope this helps.

Ray Calo
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Feb 28, 2011 | TV Receivers & DVRs

1 Answer

Unhooked all lines in back of tv cant remember to rehook up have2


There are common connections to each receiver but there are unique connections also depending on the receiver. Solo receivers have a coax cable coming from the Dish outside connected to Satellite In. Duo receivers and DVR HD receivers have the coax cable that comes from the dish outside that connects to Satellite 1 and Satellite 2 using a splitter. There is also a cable (coax, RCA (yellow, white, red) or component (green, blue, red - video, white, red - audio) or an HDMI if HD) connected from the receiver to the TV 1. For a duo receiver TV 2 may be backfed on the cable coming from the dish outside using diplexers. This may sound confusing but you can call 1-800-333-3474 for assistance.

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Jul 23, 2010 | DISH Network DVR-625 DTV Receiver /...

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You're closed captioning is all jumbled up on Seattle's KIRO TV from my DISH network. The cc works fine on all other channels. Dish says it's a network problem. Any response?

The CC is provided to DISH (and all cable/satellite companies) by the network that creates the programming. Usually, live TV (like news, sports, etc) is the most jumbled because of the time it takes someone to transpose what is being spoken as it is being spoken. If this is a network that is available OTA (via antenna), verify that the issue is not happening when you are receiving the signal from somewhere other than DISH (if you cannot receive an OTA signal, try at a buddy's house that uses another cable provider). If the problem occurs via OTA or other providers, contact KIRO to have them improve their CC service. If it only happens when viewed with DISH, contact DISH, who will then resolve the issue with KIRO (usually a lag time in signal transmission from the provider).

Feb 11, 2010 | TV Receivers & DVRs

1 Answer

Combining output from dish home distribution with ota antenna

You should have your system setup in the following manner below:

You also will only be able to receive the HD locals with a HD OTA antenna. It is possible that you will need to turn the satellite off in this room to view the OTA's effectively.

Also you should use a splitter as depicted in the picture by the red boxes to combine signals of this frequency. The blue box is the diplexer on the incoming satellite feed and the black box is the seperator that most dual tuners use. If yours does not utilize this device you will have another cable coming from the outside of the house to the back of the receiver. The location of the ports on the back of the receiver in my diagram may differ in position on your receiver so obviously connect them to the proper port. I hope this ressolves the issue and there is no need to seperaate the signal at the remote tv as it will only be a duplicate of the same signal you have connected already as OTA and the TV2 backfeed are of the same frequency range.


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Problems with subtly changing colors

What connection are you using, HDMI or component?

Also, on what source is the problem happening, through sat or through off air antenna?

If you're on HDMI I'd try component. Then, playback the affected video and see if it's reproduced w/ component.

If it's on ota only, you may have a loose tuner cable inside. It's easy to fix, you need a torx t-10 screwdriver. Unplug the unit, take the 5 torx screws off of the back cover, and on the right side you'll see 2 cables running from tuners in the front to a splitter that connects to the tuner for ota on the back right. Just make sure the connections are tight with your hands only, don't over tighten them. Also, make sure you don't touch the power supply when you have the unit open!

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