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Help please - Tuner gone bad on a series 2

Discussion in 'DirecTV TiVo Powered PVRs & Receivers' started by mikeandnikki, Dec 28, 2006.

  1. moonchilddave

    moonchilddave New Member

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    May 19, 2008
    I'd go ahead and do the PS cap and the U49 add on... Preventative measures are always good, unless you like continually tinkering with it... and a visual inspection of the cap won't always tell you if it's gone bad.
     
  2. Nittany Lioness

    Nittany Lioness Won't hurt a bit

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    Oct 22, 2010
    Oooor - ditch the whole idea and upgrade to High Def? :D-
    - see my "deal" thread if you have an opinion/suggestion.
    I'm going to post what I pay currently in that thread. I must be missing something, but it's almost the same price (after promotional year) than I'm paying now.
     
  3. moonchilddave

    moonchilddave New Member

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    May 19, 2008
    I'll switch to HD once and IF they ever announce the HD TiVo they've been promising for over a year now it seems...
     
  4. stevel

    stevel Dumb Blond TCF Club

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    Aug 23, 2000
    Nashua, NH
    Two years, but who's counting?
     
  5. chargersfan

    chargersfan New Member

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    Sep 18, 2010
    Just plain AWESOME:up:. My Hughes Tivo DVR40 was pixlating badly on Tuner 2 with occasional freezing/shutdowns. Pictures posted by dmark1867 really helped a lot.

    I'm relatively handy but I have never performed soldering in my life.
    Watched bunch of "how to solder" on YouTube and practiced on my cell phone boards from the late 90's before I tried on my Tivo (I knew those cell phones will come handy someday!). Soldering capacitors on the power board, not too bad. Soldering ridiculously thin wires to U49 without a 3rd hand required lot of repeating to myself "Patience, Young Padawan".

    Couple of tips on soldering to U49 in addition to what's being posted.
    It helps when you get the solid wire (vs stranded).
    Have soldering wick handy was absolutely necessary as I had to use it several times to clean up my handy work.

    Very proud of being able to repair Tivo on my own.
    Impressed my wife as well.:D

    Thanks again.
     
  6. Nittany Lioness

    Nittany Lioness Won't hurt a bit

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    Oct 22, 2010
    And the capacitors y'all are adding to U49 is the same size/voltage/whatever as the one replacing the power supply location? And you all are adding one?

    chargersfan - that's awesome-sauce. Good for you! I hope when hubby gets back next week we'll fix this up too. Would a wife's extra hand be useful in the soldering?
    Or do we just get in the way? :D

    Say - Are you guys suggesting the DVR without the "TiVo" is significantly different?
    Features? User-friendliness? ... I always assumed all were comparable.
     
  7. stevel

    stevel Dumb Blond TCF Club

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    Aug 23, 2000
    Nashua, NH
    The user interface of the DirecTV DVRs is different from TiVo's, but it is quite functional.
     
  8. chargersfan

    chargersfan New Member

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    Sep 18, 2010
    I did exactly as pictured and used the same capacitor for the power supply 2200uF 16v for the U49 (just one). This way you can buy the capcitor in bulk at cheaper price. I got three DVR 40 so I expect others to pixelate soon, hence bought extra capcitors.

    Wife extra hand to bring a beer.....yes.
    To hold the wire for soldering....no.
    :D
     
  9. Nittany Lioness

    Nittany Lioness Won't hurt a bit

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    Oct 22, 2010
    Gah.

    Re-reading the thread, specifically posts #107, #108 & #113 and beyond,
    and some folks are adding 470 uF 35V (or 25V ? ) capacitors,
    and others are adding the same cap as the power supply replacement calls for - a 2200 16V.

    Are both safe? Which is better?

    I don't want to blow up or short out or otherwise ruin my unit -
    What should I do?


    My unit by the way has now gotten worse - last night it had a completely blank (black) screen with only the Menu List available for view - I could click on my Now Playing shows that are stored, and their descriptions are there, but I couldn't play anything - just a blank black screen.

    I unplugged and rebooted - back to normal symptom of Tuner 2 being wonky.

    But it sure looks like it's on it's last legs. It reboots itself too, every few days, sometimes twice in a day.


    Suckage. :(
     
  10. stevel

    stevel Dumb Blond TCF Club

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    Aug 23, 2000
    Nashua, NH
    I have not gone back and looked at the other posts, but replacing one capacitor value (the uF) with a wildly different one is not a good idea. Higher voltage rating is fine, lower is not. Make sure you're talking about the same capacitor.
     
  11. Nittany Lioness

    Nittany Lioness Won't hurt a bit

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    Oct 22, 2010
    Well, that is what I'm trying to do; make sure.

    So if I replace the power supply 2200uf 16 volt with a 470uf 35 volt,
    that would be safe, since the original capacitor in that spot was 16?
     
  12. stevel

    stevel Dumb Blond TCF Club

    28,196
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    Aug 23, 2000
    Nashua, NH
    No - 470uf is very different from 2200uf.
     
  13. goony

    goony New Member

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    Nov 19, 2003
    Same reason I am waiting to switch from my SD DTivos... :rolleyes:
     
  14. ss_sea_ya

    ss_sea_ya New Member

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    Sep 2, 2010
    Alexandria, VA
    To clarify the solutions here, I think there are two different problems being addressed. In my case, w/HDVR2, I had pixelization on tuner 2. It did NOT have lockup up/frozen issues that some other people mentioned.

    So for pixelization issues (at least for the HDVR2 model), the 470uF 35V capacitor (available at Radio Shack, I think someone even posted the part #) soldered to a chip on the motherboard per the posts above has shown to remedy that problem.

    I think for other issues about lockups/reboots, the other capacitor replacement on the power supply addresses that issue. I didn't have that problem, so I didn't bother trying it. I was only going to try that if the first fix didn't work. So far it seems to be working well. I do get a very rare pixel burp, but could be caused just as likely by a plane passing by for all I know.
     
  15. sphanks

    sphanks New Member

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    Aug 13, 2007
    Anyone know of a fix for the Samsung SIR-S4080R?? I've got one that's pixelating on Tuner 2, two that aren't... It's outputting via S-video, I guess I can change that first and see if it makes a difference...
     
  16. MontyL

    MontyL Newbie

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    Dec 15, 2003
    Northwest WA
    I'll add my thanks to the pile for those who've spent the time to dig into the issue(s) and toss in a couple cents of my own:

    Having worked in the electronics industry for 15 years myself, specifically component level repair on name brand audio, video, specialized microcontroller and satellite equipment, I can say with conviction and experience that willy-nilly component value changes are inadvisable at best, hazardous to the equipment and your home at worst.

    Changing out a 22 microfarad electrolytic with a 47 microfarad may not seem to be a bad idea (larger value, better filtering or more signal passed through to the next stage), but you should always keep in mind that some engineer worked long and hard to come up with the component values used to create that wonderful piece of equipment.

    An explanation: Let's take that 470 microfarad electrolytic that is being used as a filter (AC ripple reduction or signal isolation from another section of the board) and slap a 1000 microfarad in its place. We've just increased AC current flow (and DC as well, due to the leakage of the capacitor) to that location, creating a pending failure back at the voltage regulator or in a resistor in the current path, even though dropping the component in for the failed one temporarily solved the original problem. An extra 4700 microfarad capacitor immediately after a diode bridge with the wrong current rating is a set of diodes doomed to let the "magic smoke" out, and probably soon.

    If any of you had a BUD (big ugly dish, for the uninitiated) with a Uniden 5000, 6000 or 7000 series receiver, you've been there... weak video, poor audio, odd flickering in the front panel display, remote control insensitivity, the works. Uniden shipped capacitor kits whenever we gave them a unit's serial number, no cost and no questions asked, after it was proven that inferior grade capacitors were the number one failure mode in every one of their TVRO receiver models. The kit contained 36 capacitors, a layout sheet that gave both the component ID and its location on the board, and concise dis-assembly and re-assembly instructions. Enough of them came through that I had it down to 15 minutes, lid off to lid on and onto the "done" shelf.

    Sony never gave us that much when their blasted Walkman and Discman units started showing up at the shop... ;)

    I only wish that one of us out there had a set of prints for these wonders. Scratch that, second wish. First one is that they get off their rears and get the DirecTiVo-HD out the door!
     
  17. Mark Griswold

    Mark Griswold New Member

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    Apr 22, 2003
    CT
    Quite possibly you are correct, but keep in mind quite often some bean-counting moron is trying to save 1/100 of a cent, so maybe that's why there is an adequate but inferior 22uF cap, when the engineer really intended it to be 47 uF.
     
  18. stevel

    stevel Dumb Blond TCF Club

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    Aug 23, 2000
    Nashua, NH
    I doubt there is any real cost difference between a 22uF and 47uF capacitor, and as Monty says, that can significantly change the working of the circuit.
     
  19. 72devilz

    72devilz New Member

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    Nov 8, 2008
    Just applied this fix to my hacked HDVR2 that has been set to single receiver for the past year due to pixellation. Tuner 2 is alive again and seems to be working so far, thanks for all the detailed information in this thread!
     
  20. jaydro

    jaydro Senior Member

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    Oct 19, 2003
    Durham, NC
    Coincident with the spontaneous rebooting problem discussed elsewhere, I have been seeing an increasing problem with pixelation in recordings on certain channels (HBO and locals, it seems). I just found this thread, and while I haven't tried switching or removing cables yet, I did notice the one time I caught the pixelation happening live that it was on Tuner 2 and that when I looked at signal strength it showed Tuner 2 remaining steady at 92/93 while Tuner 1 was spiking from 92/93 to 100. Pixelation resumed on Tuner 2 when I exited testing signal strength. Most people here report that their Tuner 2 shows fluctuations between 0 and normal. Any idea what may be up with mine? (Or have I picked the wrong thread?)

    One more thing: I had thought it was happening on HBO, but then I noticed in recordings that it tended to happen more on HBOe and I never saw it on HBOw, which I discovered is on a different transponder....
     

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