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Loss of digital signal

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Old 03-02-2005, 08:57 AM   #1
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Question Loss of digital signal

Greetings all,

Just joined the forum and recently purchased a Toshiba 57H94 TV. I am really enjoying it and the HD picture is stunning. I have had the unit since December of 2004 (nice little family xmas present). We were recieving the local station HD signals just fine... then one day I lost the local CBS and ABC digital signals. The regular signal comes in fine. These two stations are VHF... I was still receiving the local Fox and NBC Digital feeds (these are both UHF signals.) Then a week or so later I lost the NBC signal. When I tune to any of those stations, I get: "Digital signal strength low" displayed on the screen. However, I still receive the local Fox digital signal just fine.
I called the local CBS station to see if something went wrong at their end and nothing had changed. I am wondering if something has happened to:
1. the HD receiver in the TV or;
2. the antenna or parts of it?(Its a tower mount, rotor antenna with a coax feed into the house, and I haven't climbed up the tower to check anything.... yet.. Its a LONG way up.

My limited knowledge would tell me that if the HD receiver was bad, then I wouldn't receive any of the local stations. Is this a correct assumption? Could it only receive some stations and not others?

Am I destined to climb the tower and check connections on the antenna?

Any suggestions are appreciated...

RevItUp!

Last edited by revitup; 03-02-2005 at 09:07 AM.
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Old 03-02-2005, 09:11 AM   #2
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Try re-scanning your receiver for the OTA channels. Sometimes they upgrade the PSIP and that can cause the stations to disappear.
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Old 03-02-2005, 09:18 AM   #3
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I tried re-scanning. The receiver does not find the lost digital signals.
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Old 03-02-2005, 08:15 PM   #4
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I would be happy to try to help, but I need more information: First of all; WHERE ARE YOU? Give me a zip code so I can see what kind of reception you should be able to expect where you are. Secondly, if you are able, tell me what kind of antenna (s) you are using, whether or not you are using a preamplifier. Once I have all of this information, I can begin to suggest a remedy.
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Old 03-04-2005, 01:49 PM   #5
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Thanks for helping,

i live in zip code 43502... and receive the Toledo area stations. If i rotate the antenna i can pick up some Fort Wayne stations, but usually only do this for the Colts games!

As for the type of antenna... not sure what make and model, it was there when i bought the house, it looks like an arrow with shorter rods on the front end and longer ones to the back (nice technical language isnt it!) I took a good look at it the other day, and it is missing a few of one of the longer rods and another one is bent at about a 45 degree angle. a shorter one is missing and one is bent as well. (ice is not its friend). I think they were bent before this started happening, but not sure if they have gotten worse since then.

I also have a big round antenna on top if it, not sure which one does what.. both feed into the house via a coax cable, so i am assuming that they must connect together somewhere. I am not sure if there is any pre-amp, i am assuming so, since i can pull in the Fort Wayne stations.
Hope this info helps.. if you need more, i am planning on a visual inspection tomorrow... hope its not windy and cold!
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Old 03-27-2005, 03:50 PM   #6
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Well, I climbed about 2/3rds of the way up the tower, jiggled the coax cable to see if a connection was loose, still get the message that the digital channel signal strength is too low on all but one of the off-air channels. I still get the signal from the local Fox channel out of Toledo, fairly good signal too in the upper 80's on the TV's signal meter.

I did get a better look at the antenna. I am missing two rods, one longer one toward the back and a medium sized one. Also one of the longest rods is bent fairly severely, in all there are 4 bent rods on antenna. Maybe its time for a new antenna?

Thanks for any further suggestions on troubleshooting.
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Old 03-28-2005, 07:18 AM   #7
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Quote:
Originally Posted by revitup
Well, I climbed about 2/3rds of the way up the tower, jiggled the coax cable to see if a connection was loose, still get the message that the digital channel signal strength is too low on all but one of the off-air channels. I still get the signal from the local Fox channel out of Toledo, fairly good signal too in the upper 80's on the TV's signal meter.

I did get a better look at the antenna. I am missing two rods, one longer one toward the back and a medium sized one. Also one of the longest rods is bent fairly severely, in all there are 4 bent rods on antenna. Maybe its time for a new antenna?

Thanks for any further suggestions on troubleshooting.
It maybe that the damaged antenna is VHF only and the other antenna, the round one, was added to replace the damaged one. The first thing I think is to find out which antenna is receiving your UHF digital channels. Go to radio shacks website and look at the combination VHF/UHF antennas and see if yours look like this. The combo's have a V shaped corner reflector out towards the front of the antenna for UHF. If all the dipoles, rods, line in a single plane then it's VHF only.

If whatever antenna is receiving your UHF channels has a pre-amp then somewhere the coax must be connected to a power supply to power the pre-amp, the power supply needs to be plugged into 110-120V. You're going to need to somehow follow the coax and see if you can find the power supply, if it's there.

My guess is that the damaged antenna is VHF only and a combo VHF/UHF antenna, the round one, was put up. If it is old as well the pre-amp maybe failing or you may have a bad connection, corrosion maybe.
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Old 09-11-2005, 09:04 PM   #8
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Well, heres the lastest in this saga... Recently I took the coax cable feed from the antenna and plugged it into the Dish Network Satellite HD 811 receiver. I then did a scan for the local channels from the Dish receiver's setup menu and it found all of the local digital channels, 11, 13, 24, 36, even some out of Lansing, Michigan channel 53. I get them all just fine.

But if I take that same coax cable antenna feed and connect it to the TV's coax connection, I cannot receive channels 11, 13, 24 out of Toledo. I can get channel 36 from toledo, channel 53 out of Lansing Michigan, even channel 4 out of Detroit.

I am still unsure what the problem is when the antenna cable is attached to the TV. Wondering if there is something wrong with the HD receiver within the TV itself? Is there some way to test this further? All suggestions are appreciated.
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