Channel viewing issue, is it the box? - Canadian TV, Computing and Home Theatre Forums
 
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post #1 of 4 (permalink) Old 2011-12-29, 08:59 PM Thread Starter
 
Join Date: Dec 2005
Location: Rockland, Ontario (Served by Videotron)
Posts: 52
Channel viewing issue, is it the box?

I own an SA 8300HD. Over the last few days the reception on some channels has become progressively worse, to the point that a few of the channels are completely black with no sound. As they were getting worse, the sound would stutter, the picture would break up with blocks here and there, etc.

This is occuring on both SD and HD chanels.

Looking at the diagnostic screen (Page 5) for the Current QAM, all channels are showing a Level of plus 15 dBmV and a S/N that varys between 29 and 31 dB.

I have also noticed that as the QAM frequency gets higher, the picture/sound quality drops off. For example, a channel with a QAM frequency of 600 Mhz or less is fine. Channels with a QAM frequency between 600 and 650 Mhz have issues, and channels higher than 650 Mhz are pretty much black with no sound. Additionally, on the channels that are black with no sound and above about 700 Mhz, the Status sometimes shows "Unlocked".

I have done the cold reboot (unplug, wait 30 sec.) with no change. I also removed one splitter immediatly up from the STB, again no change. The next splitter is for my cable modem. I have not noticed any issues with my cable internet connection.

Given the above, am I looking at a dying STB?

I will be giving my provider (Videotron) a call tomorrow, but would like to be armed with more info if that is possible.

Thanks in advance,
...jim

Toshiba 42HDX82, SA8300HD (HDMI->DVI), Yamaha HTR-5440 (Optical), Samsung BD-P3600 (Component)
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post #2 of 4 (permalink) Old 2011-12-29, 11:55 PM
57
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Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
Posts: 56,027
Quote:
S/N that varys between 29 and 31 dB.
This S/N ratio is too low. Check your connections, temporarily remove any splitters and call the provider to fix the signal if it's still bad. Your signals lowering at higher QAMs indicate a possible poor quality splitter. (they can check signal from their end). There is nothing wrong with the STB. Splitters need to be rated 5-1000 MHz minimum and bidirectional.

Quote:
Level of plus 15 dBmV
This level is way too high. Have you added an amp? Remove it if you have since you can damage the STB. Here's the FAQ:

http://www.digitalhome.ca/forum/showthread.php?t=17719

I've moved your thread to the Videotron Forum - no idea why you posted in Rogers.

57's Home Theatre (Latest equipment & photos)
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post #3 of 4 (permalink) Old 2011-12-30, 09:54 AM Thread Starter
 
Join Date: Dec 2005
Location: Rockland, Ontario (Served by Videotron)
Posts: 52
Hi 57,

I posted in the Rogers SA8300HD forum because, well, it's an SA8300HD. And I thought the problem was with that.

However, it's all moot now. And I apologize for not looking into it a bit further. After my post, I remembered that our upstairs TV also uses a digital SD STB (the older SA2000) and it also showed the same issues. So, obviously, it was not the SA8300HD that was the problem.

And, as of this morning, all is well. S/N is back up to 35, and all channels are looking good. Either Videotron fixed something overnight, or the cold weather was doing something. I'm going to have a look at the connection on the side of the house later to ensure it is solid, as I did have a bad connection there a couple of years ago.

In any case, thank you for your reply.

Regards,
...jim

Toshiba 42HDX82, SA8300HD (HDMI->DVI), Yamaha HTR-5440 (Optical), Samsung BD-P3600 (Component)
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post #4 of 4 (permalink) Old 2011-12-30, 11:21 AM
 
Join Date: Aug 2011
Location: Montreal, QC
Posts: 277
To avoid any further problem, you should look again at the QAM Level. For any channel between 300 Mhz to 800 Mhz, it should ideally be somewhere between -10dB and +10dB.

+15dB is too high, so adding a splitter will lower it to +12dB, which is acceptable. If the levels are back to the above-mentionned range today, it means that Vidéotron fixed the problem overnight.

CM-3020 with CM-7777
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