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Weak or no Signal with Cable box and HDTV

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Old 06-06-2008, 07:44 PM   #1
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Default Weak or no Signal with Cable box and HDTV

I have a 50 inch samsung (model: HPT5054). I don't know if it is 1080i or 720p. tv hooked up to a 8240HDC Scientific Atlanta hd dvr. I am using the hdmi interface. I have tried the component cables but I have trouble getting it to display the full screen. I have two problems.

The first problem is that when i first turn on the tv I get a weak or no signal message with a black screen. I turn off the tv and then turn on and then it works fine. This used to work fine all the time. I have replaced the cable box but still have the same issue.

The other problem is that the tv always starts with the black lines on each side of the screen. To fix it I go to the menu on the cable box and change the output resolution and it fixes it. On the output resolution screen it displays all the resolutions that are available. I always have the 480p 720p 1080i options selected. All I do is unselect one and then select it again and it fixes it. It doesn't matter which one.
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Old 06-07-2008, 06:28 AM   #2
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Quote:
Originally Posted by mconnors100 View Post
I have a 50 inch samsung (model: HPT5054). I don't know if it is 1080i or 720p. tv hooked up to a 8240HDC Scientific Atlanta hd dvr. I am using the hdmi interface. I have tried the component cables but I have trouble getting it to display the full screen. I have two problems.

The first problem is that when i first turn on the tv I get a weak or no signal message with a black screen. I turn off the tv and then turn on and then it works fine. This used to work fine all the time. I have replaced the cable box but still have the same issue.

The other problem is that the tv always starts with the black lines on each side of the screen. To fix it I go to the menu on the cable box and change the output resolution and it fixes it. On the output resolution screen it displays all the resolutions that are available. I always have the 480p 720p 1080i options selected. All I do is unselect one and then select it again and it fixes it. It doesn't matter which one.
Disclaimer...

The following is from a quick look at your TV's Users Manual. I also don't have your STB or TV...

So as always YMMV...

I would check...
  • The SA 8240HDC is setup for Auto DVI/HDMI or something similar if your using the HDMI interface. On my SA 8300HD device I press Settings twice then select Set Picture Format:.
  • On your TV make sure its set for 16:9 or Just Scan. See page 28 of the Users Manual for your TV.

    http://org.downloadcenter.samsung.co..._0226_book.pdf

  • Only use HDMI or Components cables to connect your TV. Don't have both connected at the same time.
  • Turn on the cable STB first then the TV.
  • Make sure all connections are tight. No loose connetions.

Good luck...
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Old 12-17-2008, 07:10 PM   #3
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Default Periodic No Signal via HDMI on Samsung 46A630 LCD TV

I first purchased a 40" Samsung 630 Series TV - all was good, HDMI cable from my HD BOX was fine. Then after about a week I started getting this "no signal found" when i turned on the TV. I decided not to take my chances and I returned the tv and bought a 46" Samsung, 630 Series. I've had this one now for 4 weeks now and it's starting again! I even bought a new HDMI monster cable. Weird part is, If I hook up my crappy 22" Visio LCD TV it works fine. As soon as I reconnect my Samsung it starts working again. Is it me? Or is there something more technically wrong going on here?
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Old 12-17-2008, 07:33 PM   #4
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It sounds like the dredded HDMI/HDCP handshake issue between the 2 devices. Since it is also happening with you new TV, it sounds like the issue is from the source (cable STB).. That was common with some of the older cable boxes, but not so much now a days. I would call you cable company and explain it is happening with 2 seperate TV's and see if they have a firmware upgrade fix or can give you a new box. You can simply connect the HD box via component cables (it will render the same HD PQ) if the cable company gets you no place. No handshake issues with component at all. You can also try a different HDMI cable just to rule that out, but I think it is the box..
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Old 12-18-2008, 08:53 AM   #5
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Quote:
Originally Posted by meffysk View Post
... I even bought a new HDMI monster cable...
Ouch!

I would not have brought that up!
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Old 12-21-2008, 11:46 PM   #6
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Quote:
Originally Posted by Bigloww View Post
It sounds like the dredded HDMI/HDCP handshake issue between the 2 devices. Since it is also happening with you new TV, it sounds like the issue is from the source (cable STB).. That was common with some of the older cable boxes, but not so much now a days. I would call you cable company and explain it is happening with 2 seperate TV's and see if they have a firmware upgrade fix or can give you a new box. You can simply connect the HD box via component cables (it will render the same HD PQ) if the cable company gets you no place. No handshake issues with component at all. You can also try a different HDMI cable just to rule that out, but I think it is the box..
Thanks for the info I learned something useful!
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Old 12-23-2008, 12:19 PM   #7
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Default Solution for "Weak or No Signal"

If the Tv doesnt shows you image you just have to click the source or the video source button in your remote control and it will appear a window with TV, AV2, HDMI2/DVI options and stuff like that, the only thing you have to do is to move to the HDMI2/DVI option while pressing video source button several times, then press ok and it will solve the problem for samsung TVs, with warner cable control.
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