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Pixelation in Hughes HDVR2

Discussion in 'DirecTV TiVo Powered PVRs & Receivers' started by direfan, Jul 25, 2008.

  1. e30mpwrd

    e30mpwrd New Member

    237
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    Jan 16, 2003
    Philly
    So like everyone else in this thread, one of my DirecTiVo's was having serious pixelation issues on higher channels on tuner 2 starting over a year ago. It went away when I switched from SVideo to composite, but recently I've started having issues where the TiVo completely loses picture--which is corrected by wiggling the composite video cable.

    I assumed it was the capacitor in the power supply and finally decided to replace it. I got the new capacitors, and pulled the TiVo apart tonight. The capacitor in the power supply looked fine, but I replaced it anyway to no avail (the process was easier than I was expecting!). I then switched power supplies with another TiVo that was working and that didn't correct the issue either --and the other TiVo is still working fine. So, the power supply has officially been eliminated as the source of my issue.

    Anyone figure out what else might be causing this issue?

    S-Video is working again after the power supply failure (for how long I don't know), but signal strength on Satellite A, transponder 17 is steady at 89 or 90 for satellite in 1, but on 2 it sits at 86 or 87 for a moment, drops to 0 / no signal, then back to 86 or 87 again--and just bounces back and forth. Same thing with transponder 19, 25, 26, 27 and 29. Didn't check the other satellites.

    Any ideas for what to do next would be appreciated!

    Thanks,

    Tim
     
  2. Beer Geek

    Beer Geek New Member

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    Mar 14, 2007
    e30mpwrd- I'm having the exact same issue. This is on my original HDVR2. It had problems with Tuner 2, and I eventually moved it to a TV where I only have 1 incoming cable and shut off Tuner 2.

    The behavior is the same- lousy pixellated picture, 101 transponders bounce from zero to high 80's/90's and back. I had been running it off coax to the TV, and that was periodically getting fuzzy and going away. Unhooking/rehooking it or bumping the connector at the TV would fix it. In my (total lack of) infinite wisdom yesterday, I hooked up an S-video cable instead and that made the picture go to unwatchable. I've powered it down right now b/c the picture stayed as bad even hours after switching back to the coax.

    I haven't popped the top to look at the power supply caps. Nor have I tried switching inputs at the multiswitch at the dish.

    Also, certainly open to ideas.
     
  3. e30mpwrd

    e30mpwrd New Member

    237
    0
    Jan 16, 2003
    Philly
    Looks like this thread has the most current info on this issue: http://www.tivocommunity.com/tivo-vb/showthread.php?t=333631
    It seems that if the power supply isn't the source of the problem for your TiVo (as it wasn't for mine), the only solutions are to use it with component video instead of S-Video until that fails too, and then the last option is to have it repaired for $100. I'm tempted to buy another one on e-bay instead, but it seems likely they'll all be developing these problems as time goes by...
     
  4. jonbig

    jonbig New Member

    128
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    Sep 22, 2003
    Yeah, I just swapped my two HDVRs because one of them was starting to pixelate on tuner 2. The other HDVR only had one satellite input hooked up to it, so I was only using three tuners anyway.

    Just hanging on with what I've got until the new DirecTivos are available.
     
  5. Beer Geek

    Beer Geek New Member

    22
    0
    Mar 14, 2007
    Thanks, by the way for pointing me in the right direction. That HDVR2 is off to CCS for a spa treatment. Not too bad in terms of expense for a piece of electronics that I've had for 7 years.
     
  6. Montalvo

    Montalvo New Member

    17
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    Feb 21, 2005
    OK, I've been lurking on this thread for months and have dutifully a) bought a used unit on E-Bay and installed its power supply, b) bought capacitors and replaced them, c) had a DirecTV tech out to check my signals, d) installed a brand new power supply and e) made sacrifices to the TiVo god...all to no avail. It's not that I'm so enthralled with this TiVo box but it's dialed into a Crestron home automation system and replacing it will be a real pain (and costly, too).

    So last week, I pulled the box open once again and happened to notice how much heat was radiating from the copper heat sink above the capacitors. "Hmmm...heat can often cause problems with electronics," I thought to myself. So I left the unit outside in the cold for a while and reinstalled it...without putting the housing back on. Voila...tuner 2 had no more pixelation or signal distortion on those channels that were a problem. I've continued to run the unit without the housing and the tuner 2 problem seems to have disappeared. I'm going to drill a bunch of holes in the housing directly over the capacitors' heat sink to see if that'll allow me to reinstall the cover. I'll let you know how that works.

    Thanks to all who've taken the time to post on this topic. Despite all my fruitless attempts, at least it gave me some direction until I found something that worked. And I don't know whether MY solution will work for everyone, but it's worth a try since it's easier and cheaper than most of the others that were recommended.
     
  7. marrone

    marrone Phased Member

    1,429
    0
    Oct 11, 2001
    Melbourne, FL
    Please write back and let us know your findings.

    Also, can you tell us what the internal temperature is of your Tivo under system information?

    I'm having the issue on my SD-DVR40, but haven't verified if it's tuner 2 or not.

    Thanks
    -Mike
     
  8. Montalvo

    Montalvo New Member

    17
    0
    Feb 21, 2005
    I'm sorry to report that the pixelation on tuner 2 has returned to normal after disappearing for awhile following my chill-down experiment described above. Even before attempting to reinstall a more heavily vented housing, the signal distortion returned. I used a laser thermometer to measure temperatures of the various components and none seemed to run excessively hot (80-100 degrees for capacitors and up to 140 for chips). It may well be that heat IS causing the problem but that some electrical component has degraded to the point that even a modest amount of heating causes a performance degradation. And the improvement that I experienced only continued until some combination of heating and time caused the degradation to re-emerge.

    Damn, I thought I'd be eligible for some kind of medal for solving this vexing problem. Instead, I'll just spend $100 (on top of all the other money I've already spent) to have the unit repaired.

    Bob
     
  9. theta.bowden

    theta.bowden New Member

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    0
    Jun 15, 2007
    Having same problem as everyone else. Moved to composite cable about a year ago and that worked for a good while, but lately the problem has returned.

    Switched cables between tuner1 and tuner2 and the problem remained with tuner2.

    In the course of switching, I was tuned into two stations: 359 on tuner1 and 355 on tuner2. 355 is one of the channels that has given me the worst problems. So, when I switched the cables, 355 was now on tuner1 and the pixellation was gone. On tuner2, 359 does not cause any problems anyway.

    The result is that it appeared that all my problems disappeared. (Of course, if I returned 355 to tuner2, the problem was still there.)

    If I could figure out a way to make my problem stations always come up on tuner1, this would be a kludgy but mostly workable workaround. Of course, it wouldn't be a workaround in the case where both programs I wanted to watch were on "problem channels". And, it's easy to imagine the problem spreading to more and more channels with time.

    But for now, it's working. Does anyone know of any available mechanisms to manage which tuner is being used at any particular point in time? Optimally, I'd like to force my sports recordings (ESPN can be a problem channel) to tuner1.

    Any ideas on this kind of approach?
     

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