/
07.09.2009 12:00AM
Update on Limited Vizio ClearQAM Channel Choices


I have an update on my previous article about a cable TV operator trying to make it easy for consumers to receive ClearQAM basic digital channels without a set-top box. He found some Vizio receivers were able to receive only a narrow band of frequencies, not the entire cable TV band. It turns out the frequency range was not the real problem.

I've received a number of e-mail messages from readers about this. First, readers with Vizio DTV sets on cable systems where the proper station major/minor channel number is displayed (example “4.1”) were able to receive ClearQAM signals over the entire band. This pointed to the cable PSIP as the source of the problem.

Recently I heard from the cable operator and also one of his subscribers. The cable operator reported, “After a lot of testing and experimentation, we discovered that the presence of PSIP data on encrypted QAM streams was having an impact how these sets tuned and/or resolved the clear QAM streams. We still don't understand the relationship, but found that more and more ClearQAMs became visible to these sets as we stopped sending PSIP data on other streams.”

The subscriber also contacted Vizio. They suggested a double re-scan (scan once with no connection to the antenna/cable input and scan again with it attached). The subscriber was able to use this to restore the channels, but lost them when the set was powered off and on again. Vizio suggested another technique that apparently does a hard reset on the tuner. This procedure involved unhooking the coax from the antenna/cable input, unplugging the TV set, holding the power button down for 30 seconds while reconnecting power and coax, then doing a re-scan. That, he said, solved the problem.

The cable operator was also making changes to solve the problem, so it isn't clear if this reset or the cable operator's efforts fixed the problem. However, readers may want to keep this reset handy if they run into any channel scanning problems with Vizio DTV sets.


Comments
Post New Comment
If you are already a member, or would like to receive email alerts as new comments are
made, please login or register.

Enter the code shown above:

(Note: If you cannot read the numbers in the above
image, reload the page to generate a new one.)

1.
Posted by: Anonymous
Sat, 04-26-2014 - 8:00PM Report Comment
Just purchased a 42 in Vizio and seem to be having double channels. One channel is fuzzy while the other clear. Also the remote control being used seems to be very sensitive, linger on a number a little too long and the number just keeps going. 2...222222. This is driving us nuts, because it's driving our 89 year old mother nuts. Please help.
2.
Posted by: Tom Butts
Sun, 08-01-2010 - 11:19AM Report Comment
Using the "reset" worked on my 32" Vizio.
3.
Posted by: Tom Butts
Sun, 01-24-2010 - 6:06PM Report Comment
This worked for me on my 37" Vizio




Thursday 2:01PM
IBC APP Now Available
I downloaded the app and found it useful for my main IBC pitfall


 
Featured Articles
Discover TV Technology