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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. Krosis

    Krosis The Bearded One TCF Club

    2,858
    4
    May 9, 2004
    Illinois
    I haven't been visiting this forum recently but paid it a visit yesterday. I've been having pixelization issues that I've tracked down to tuner #2. I did try new cables and a new LNB without success. I had the cables already and at 6.95 for a new LNB it seemed worth a shot even though my testing indicated a Tivo problem.

    I saw this thread at the top of the listing, I think it was waiting for me to see it. :)

    I decided to give the fix mentioned in this thread a shot. I found a 220uf 16 volt capacitor on an old circuit board and commandeered it. The leads were a bit short but after some fiddling around I got it to stick to the IC. Hooked it back up to the dish and gave it a try.

    IT WORKS!!!!!

    Thanky thanky to all!

    Sad thing is I recently got a new HDTV and I suspect my series 2 DTV Tivo's days are numbered. It doesn't pixelate anymore but it is still fuzzy. :(

    Maybe I'll put it in the bedroom with the other ancient technology (tube TV).

    Thanks again to all!
     
  2. vaslim2

    vaslim2 New Member

    1
    0
    Dec 17, 2010
    For weeks now, my older Hughes Direct Tivo has been messing up on tuner 2. I have done everything, tightened wires, replaced lmb, removed wires, rebooted numerous times and nothing helped. I tried an old Tivo and both tuners were at 100. Hooked mine back up and still messed up on tuner 2. I happened upon this site and read to remove the s wire. It has been hooked up for quite a while, but it worked! I could not believe it but it has been at least an hour and both tuners are working great. Thank you all for your help!
    I have added this site to my favorites.
     
  3. Feb 2, 2011 #163 of 190
    revansCAAD8

    revansCAAD8 New Member

    16
    0
    Sep 14, 2010
    Well our RCA DVR40 now has the tuner 2 pixilation issue (even on coax). So after finding and reading this post yesterday (THANK YOU!) we purchased the 470uf 35v capacitor, 60/40 rosin flux core solder, and very small 30ga wire at RS. Opened up the TIVO but can't say I'm not a little nervous soldering in such a small/tight area and being a novice. So, assuming others are still having good luck with this mod!?!?!?, please help me confirm the procedure:

    1) Find and briefly heat (3 sec or less?) IC pins 3 & 7 with a solder iron to prepare/clean the surfaces?
    2) Allow to cool and then return to "Tin" the IC pins leaving a small solder blob where I will be attaching the wires.
    3) Strip wire insulation (little as needed) and Tin the ends that will be attached to the IC pins.
    4) Hold/tape the wires to IC pin locations, hold solder iron against wire until the solder melts & connects to pins, remove iron and allow to harden/cool. Check for bridged pins and correct/clean if needed.
    5) Route wires to Capacitor mounting location. Should this be directed as far away from Turner 2 as possible (opposite direction of Dmark1867 pic #3)? Can I use Super Glue to mount the Wires & Cap?
    6) Cut/strip/& Tin wires to attach capacitor.
    7) The capacitor has rather long leads, should these be cut/shortened? Then Tin leads.
    8) I don't have a wire-wrap tool, so should I twist the wire to the cap leads? Then solder the wires to the cap (making sure polarity is right!)
    9) Mount/glue the Cap.
    10) Re-check all solder joints and cleanup.
    11) Pray all works!!

    Thanks again to all that have invested in this post and for the help!
    Robert
     
  4. Mar 3, 2011 #164 of 190
    revansCAAD8

    revansCAAD8 New Member

    16
    0
    Sep 14, 2010
    Disappointed that nobody responded but wanted to report back that we completed the fix and is working great! :up:

    Thanks all!
    Robert
     
  5. Mar 3, 2011 #165 of 190
    mrfixit454

    mrfixit454 New Member

    110
    0
    Feb 9, 2004
    Hi Robert, Sorry no one responded, sometimes you have to try things out solo and hope for the best. I had the same experience on another forum.. I was trying to fix one of those over the air DTV converter boxes. I had to change a bunch of caps and had a few questions. Never got answers so just bit the bullet and did it and it worked just fine.

    Take care
    Fixit
     
  6. Mar 3, 2011 #166 of 190
    ss_sea_ya

    ss_sea_ya New Member

    82
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    Sep 2, 2010
    Alexandria, VA
    Ditto here.

    I should have mentioned to get a strong pair of reading glasses at the $1 store. I'm not a a soldering expert, but your method seemed sound. (Very good explanation by the way.) I ended up getting a bud to help me after my feeble attempt. We did solder the capacitor directly to the chip. We also used a fine tip soldering iron. Only other tip I would add is old phone wire trick is to twist the wires together then solder.
     
  7. Mar 8, 2011 #167 of 190
    randywdtivo

    randywdtivo dtivo enthusiast

    12
    0
    Jun 12, 2004
    I added a 2200 uF electrolytic cap in parallel with a 10 uF tantalum (sometimes they can improve filtering, even though the capacitance is a lot smaller) across pins 3 and 7 of the filter chip. Used about 2 inches of 30 ga. wire wrap wire from the caps to the chip. There was definite improvement in tuner 2's performance, but it wasn't a complete fix. Still some pixelization, even with only composite connected, and the Sat 2 "meter" still fluctuates between 0 and 92.

    I am wondering whether the 30 gq. wire has enough inductance to cause a problem, or whether having the caps located near the filter chip is a bad idea. Haven't tried replacing the caps on the PS - they look OK visually.

    Anyone have any ideas what I should try next?

    Has anyone thought of pulling pin 7 off the board and installing maybe a 47 ohm resistor in series with the chip's VCC+? That might improve the filtering a lot.

    Any good ideas would be appreciated!
     
  8. Mar 8, 2011 #168 of 190
    ss_sea_ya

    ss_sea_ya New Member

    82
    0
    Sep 2, 2010
    Alexandria, VA
    Try the 470uF capacitor. That seems to work.

    Also, wire wrap may not provide you decent conductance to the capacitor.
     
  9. Mar 9, 2011 #169 of 190
    revansCAAD8

    revansCAAD8 New Member

    16
    0
    Sep 14, 2010
    Randy, I used the (1) 470uF cap with 30g wire but mounted the cap as far way and directed the leads away from the turner2 as possible, so to not cause interference. Working great here. I rarely even get one blip an hour on those channels now. Hope this helps!

    Robert
     
  10. Mar 9, 2011 #170 of 190
    randywdtivo

    randywdtivo dtivo enthusiast

    12
    0
    Jun 12, 2004
    Will try moving the caps away, and use heavier wire after about 1" of 30 ga. Don't want to try soldering heavier gauge wire to those little SMD pins. Can't see why 470 uF would work better than 2200 uF.

    Thanks for the suggestions.
     
  11. Mar 9, 2011 #171 of 190
    ss_sea_ya

    ss_sea_ya New Member

    82
    0
    Sep 2, 2010
    Alexandria, VA
    Not sure either(as my electronics classes are long long forgotten, but the 470uF has worked in all cases reported in this thread. I do not recall any other capacitor being used for the solution. My guess is you are not getting good conductivity to your capacitors, so you are not seeing any improvement.
     
  12. Mar 9, 2011 #172 of 190
    ss_sea_ya

    ss_sea_ya New Member

    82
    0
    Sep 2, 2010
    Alexandria, VA
  13. Mar 9, 2011 #173 of 190
    ss_sea_ya

    ss_sea_ya New Member

    82
    0
    Sep 2, 2010
    Alexandria, VA
  14. Mar 9, 2011 #174 of 190
    randywdtivo

    randywdtivo dtivo enthusiast

    12
    0
    Jun 12, 2004
    I will try the 470 uF cap. If it does work better it will probably not be due to the value (bigger is pretty much always better for a filter cap, within reason, unless there is some other quality difference or something). But the 470 will be in a much smaller package, with smaller diameter leads so might cause less of an interference problem.
     
  15. Admdata

    Admdata New Member

    82
    0
    May 9, 2010
    Greeley PA
    Need Help,

    I took and soldered a 470uf capacitor to the u49 pins 3 and 7 now I don't have any color output though the s-video cable and no output though the rca (yellow) video cable, all items are black and white menus and programs (ones recorded before I tryed this fix) I removed the capacitor and no change, I thought it was from solder getting on other wires in the u49 ciurit took out the solder no luck. See photo


    [​IMG]
     
  16. litzdog911

    litzdog911 TechKnow Guide

    12,018
    0
    Oct 18, 2002
    Mill Creek,...
    Hard to tell from the photo, but it looks like you might have damaged that chip, or its solder pads.
     
  17. ss_sea_ya

    ss_sea_ya New Member

    82
    0
    Sep 2, 2010
    Alexandria, VA
    My first feeble (yet gental) attempt yielded the "black and white" picture. Try gently cleaning up the solder. Heat quickly and suck up with solder wick to clean up the area. Make sure no solder is touching between pins. If after cleaning up, no color, then maybe chip is toast. (And if so, you might be able to replace it, just not easily).

    My buddy has a fine tip solder pen and that worked well for the soldering job. It is a tough job (and he had lot of experience soldering), a fine tip soldering pen works well, good eyes, prob super strong magnifying glasses and and extra set of hands.

    Hard to tell, but looks like there is lots of dust? You may want to try and blow that out. Also is the capacitor straight "up" in the pic ok? (not sure if that has any relation to the problem, but it looks like is it scarred on the side).
     
  18. revansCAAD8

    revansCAAD8 New Member

    16
    0
    Sep 14, 2010
    Yeah that looks nasty :-( It's likely that you have bridged pins.
    Also, it's hard to tell from the picture but looks like you may have soldered the wrong pin!? Pin 7(+) is closest to the three capacitors but is actually the second pin from the left (your pic looks like you soldered the 3rd?) and Pin 3(-) of course is on the other side. Look CLOSELY at the pictures on Page 5, post #134.

    Hope this helps,
    Robert
     
  19. Admdata

    Admdata New Member

    82
    0
    May 9, 2010
    Greeley PA
    The capacitor in the photo just has some solder on it from my attempts to remove it


     
  20. Admdata

    Admdata New Member

    82
    0
    May 9, 2010
    Greeley PA
    in the photo in my earier post the captior I bought I removed it, after I found my "problems (IE black and white picture), also I hookup everything to sat 2 tuner now it is baddly pixelated and goes to searching for singal.
     

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