Re: HVR 1600 Distortion

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On Sat, Sep 18, 2010 at 8:58 PM, Devin Heitmueller
<dheitmueller@xxxxxxxxxxxxxx> wrote:
> On Sat, Sep 18, 2010 at 8:42 PM, Josh Borke <joshborke@xxxxxxxxx> wrote:
>> On Sat, Sep 18, 2010 at 8:20 AM, Andy Walls <awalls@xxxxxxxxxxxxxxxx> wrote:
>>> On Fri, 2010-09-17 at 18:23 -0400, Josh Borke wrote:
>>>> Thanks for the response!  Replies are in line.
>>>>
>>>> On Thu, Sep 16, 2010 at 6:48 PM, Andy Walls <awalls@xxxxxxxxxxxxxxxx> wrote:
>>>> > On Wed, 2010-09-15 at 22:54 -0400, Josh Borke wrote:
>>>> >> I've recently noticed some distortion coming from my hvr1600 when
>>>> >> viewing analog channels.  It happens to all analog channels with some
>>>> >> slightly better than others.  I am running Fedora 12 linux with kernel
>>>> >> version 2.6.32.21-166.
>>>> >
>>>> >
>>>> >> I know I need to include more information but I'm not sure what to
>>>> >> include.  Any help would be appreciated.
>>>> >
>>>> > 1. Would you say the distortion is something you would possibly
>>>> > encounter on an analog television set, or does it look "uniquely
>>>> > digital"?  On systems with a long uptime and lots of usage, MPEG encoder
>>>> > firmware could wind up in a screwed up state giving weird output image.
>>>> > Simple solution in this case is to reboot.
>>>>
>>>> I'm not sure if I would classify it as "uniquely digital".  The
>>>> distortion happens across most of the screen with it being
>>>> concentrated in the top third.  Additionally shows that include black
>>>> bars the top black bar is seemingly stretched and the image seems like
>>>> the colors are over-saturated where they colors are brighter.
>>>> Rebooting had no effect :(
>>>
>>> OK.
>>>
>>>> > 2. Have you ensured your cable plant isn't affecting signal integrity?
>>>> > http://ivtvdriver.org/index.php/Howto:Improve_signal_quality
>>>>
>>>> The cable plant hasn't changed the signal strength or integrity as far
>>>> as I know.
>>>
>>> OK.  Keep it in the back of your mind though.
>>>
>>>> > 3. Does this happen with only the RF tuner or only CVBS or only SVideo
>>>> > or more than one of them?  If the problem is only with RF, then it could
>>>> > be an incoming signal distortion problem.  Do you have cable or an over
>>>> > the air antenna for analog RF?
>>>>
>>>> I only have input for the RF tuner.  I have cable for analog RF.
>>>
>>> Please try and test the output of a VCR or DVD play plugged into the
>>> HVR-1600.  (We don't need sound, just the video.)
>>>
>>> This will tell us if the problem happens before the CX23418 chip's
>>> analog front end (i.e. in the RF and analog tuner) or not.
>>>
>>>
>>> $ v4l2-ctl -d /dev/video0 -n
>>> (List of possible inputs displayed)
>>>
>>> $ v4l2-ctl -d /dev/video0 -i 2
>>> Video input set to 2 (Composite 1)
>>>
>>> # v4l2-ctl -d /dev/video0 -s ntsc-m
>>> Standard set to 00001000
>>>
>>> $ cat /dev/video0 > foo.mpg
>>> ^C
>>>
>>
>> I only have S-Video but doing this produced a perfect picture.
>
> Before debugging any further, it might make sense to install the tuner
> into a Windows box and make sure it's not just a hardware failure in
> the can tuner.
>
> Devin
>
>
> --
> Devin J. Heitmueller - Kernel Labs
> http://www.kernellabs.com
>

It could be the tuner card, it is over 2 years old...Why would the
analog tuner stop functioning while the digital tuner continues to
work?  Is it because the analog portion goes through a different set
of chips?

Thanks,
-josh
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