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Replacement fan

Discussion in 'TiVo Series3 HDTV DVRs' started by jswartz, Sep 26, 2011.

  1. unitron

    unitron Active Member

    16,390
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    Apr 28, 2006
    semi-coastal NC
    The upgrade forum has a SATA/IDE adapter thread, which I was able to get the mods to "stickify". You should start a replacement/upgrade fan thread in that same forum and ask the mods to sticky it.

    Or maybe start it, get a number of worthwhile posts on it, and then ask for it to be stickied.
     
  2. MeInDallas

    MeInDallas Member

    910
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    Jul 31, 2011
    Dallas, Texas
    Here's a pic of it if that helps you :)
     

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  3. unitron

    unitron Active Member

    16,390
    2
    Apr 28, 2006
    semi-coastal NC
    I need to see the other ends.
     
  4. MeInDallas

    MeInDallas Member

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    Jul 31, 2011
    Dallas, Texas
    OK here's where the power is connected to the power supply, I hope this helps more. It's hard to take a clear pic of it :(
     

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  5. MeInDallas

    MeInDallas Member

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    Jul 31, 2011
    Dallas, Texas
    Also, does anyone have any idea at all what this 4 pin connector is for on the motherboard? I might post this on the main forum to see.
     

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  6. unitron

    unitron Active Member

    16,390
    2
    Apr 28, 2006
    semi-coastal NC
    The TX (transmit), G (ground), and RX (receive) labeling on the board adjacent to 3 of the 4 pins probably means that it's a serial port of some kind.

    A quick Google later...

    If you Google

    Serial Console on THD

    the first response should be to a thread on the "site whose name must not be spokent here"

    Here's the direct link

    http://www.************.com/forum/showthread.php?56384-Serial-Console-on-THD.

    which you can see gets filtered.

    But if you can Deal with searching the internet's vast Database, you'll know you're in the right place.

    Let me know if you find out what that 4th pin is.

    Although it could be nc (no connection) and they just used a 4 pin to avoid mixing it up with a 3 pin fan header. Does the HD have a 2 or 3 pin fan header?
     
  7. MeInDallas

    MeInDallas Member

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    Jul 31, 2011
    Dallas, Texas
    The fan is just a 2 pin. The replacement everyone has been using from Newegg is a 3 pin but you just put it in the red and black wire holes and the motherboard takes care of the speed.

    Thanks for posting about the 4 pin, I am going to look further into that one. I was hoping for another power connector of some kind, but looks as if its some sort of diagnostic. I'll go read more about it. I'm going to work on that hard drive cooler too, I been wanting to do that for a long time now. :D
     
  8. unitron

    unitron Active Member

    16,390
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    Apr 28, 2006
    semi-coastal NC
    Do you know which end of a soldering iron to hold?

    Do you own a volt/ohm meter or multimeter?

    If you know what you're doing you can tap into ground and +12V (should be the yellow wires, but that's not guaranteed, hence the need for the meter) where the wires come off of the power supply.
     
  9. MeInDallas

    MeInDallas Member

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    Jul 31, 2011
    Dallas, Texas
    I have a soldering iron yes and know how to use it. I dont have a voltmeter though. I'm thinking I can borrow one from someone though I know. Would it be best to tap off the wires that are going to the hard drive? I know in the older Series 2 you could just get one of the many molex adapters and add stuff there where the hard drive was connected so easy.
     
  10. Atomic Taco

    Atomic Taco Member

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    Jan 27, 2005
    Seattle
    Is that what the About page shows me is HDD temp?

    Here's a graph of the HDD temp of one of my servers. Prior to the big jump in April the server was in a colocation center with lots of fans and a massive HVAC. In April, I pulled this box out of the colo and it sits at home with the top off. IIRC, the HD I have in there was actually pulled out of a TiVo HD. It's a Seagate something.
    [​IMG]

    I plugged the three pin connector in to the mobo where the other fan was. I had the red and black cables in the mobo. The other cable was blue and as I understand is just a speed control and the fan wouldn't work if both the red and black weren't plugged in.

    Yes, that was me. Maybe "in the next room" is a bit of an exaggeration because I was within a visual sight line of the unit, but I was more than 12 feet away.
    Indeed

    --

    Regarding adding an extra fan, I wonder if the TiVo's PSU could be replaced with this?
    http://www.mini-box.com/picoPSU-90

    You'd get the extra 4 pin connector you need, plus a non-proprietary SATA power connector. Plus, the brick sits outside the TiVo, so you might not need the TiVo fan at all. Based on the fan's position on the TiVo, it appears it is there to cool the PSU more than the other components.
     
  11. unitron

    unitron Active Member

    16,390
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    Apr 28, 2006
    semi-coastal NC
    I was thinking, without ever actually having had my hands on an S3 power supply, that you could unsolder the yellow wires, add a skinny yellow wire into the hole with them, and re-solder, and the same with a skinny black wire for the ground. Don't actually mess with the hard drive's power leads except for temporarily unsoldering 2 of them at the power supply.

    Those 2 wires could be the bare leads from a fan, but I'd feel much, much better if there were some sort of disconnect involved that allowed easily disconnecting the hard drive fan without leaving either of the wires added to the power supply "exposed", electrically speaking.

    Another possibility is an item I used back in the '70s on car stereo installs.

    3M makes a "Scotchlock" connector that's sort of "T" shaped. The crossbar part of the "T" pierces the insulation of the wire you're tapping into, and the up and down part of the "T" is a 1/4" female quick connect, and there's insulating plastic enshrouding the whole thing except for the end where you plug in a 1/4" male quick connect with an oversized insulating shroud that goes over the insulating shroud of the "T" connector.

    Perhaps you could find them in an auto parts store if you don't have a decent electronics supply house in town, as so many of us no longer do.
     
  12. unitron

    unitron Active Member

    16,390
    2
    Apr 28, 2006
    semi-coastal NC
    The TiVo doesn't use an ATX power supply, it uses a TiVo power supply (in some cases supplying a low current 30 or so Volts for the reverse bias on the tuner varactors, a sort of Zener diode used as a voltage-variable capacitor), and there's speed control and temperature sensing circuitry on the TiVo motherboard for the chassis fan.

    Also, the TiVo's chassis fan may be near the power supply's heat sinks, but the air inlet holes are placed so as to cause the fan to pull air over the motherboard and hard drive as well, and I'm sure that's not co-incidental.

    What would be great, and will never happen for legal liability and cost of UL approval reasons, is a piggyback power supply that had spring metal contacts to connect to the AC jack on the inside where there's exposed metal, so that it and the original power supply shared the same line cord coming from the wall socket.
     
  13. Atomic Taco

    Atomic Taco Member

    118
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    Jan 27, 2005
    Seattle
    All that's beyond me.

    But in response to your parallel plug thing, you could always get something like this and run the fan on it. While it wouldn't power on and off with the TiVo, you could put it on a switched outlet or ignore it since unplugging the TiVo is such a rare occurrence.
     
  14. unitron

    unitron Active Member

    16,390
    2
    Apr 28, 2006
    semi-coastal NC
    You'd have to find a way to run the output cable of that thing into the TiVo or the hard drive fan cable out of the TiVo.

    Not saying it can't be done, but I like the idea of keeping it all inside the TiVo better, but others may have other preferences.

    Thanks for the link, though. It looks like something that would be handy on the test bench.
     
  15. husky55

    husky55 Member

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    Feb 2, 2008
    Madison, CT
    OK, as a Tivo owner who has really struggled with the fan noise in the Tivo HD for the last three years, let me share some experiences.

    I bought the Ebay JMC ,the Newegg Evercool and also the OEM fan from WeakKnees for both my HD and Premiere. The fans are different sizes of course.

    The JMC has 2 pin and plugs right into the TivoHD fan connector. It's a real replacement for the Tivo OEM fan Cofan. Output is the same, may be a little quieter.

    The Weakknees OEM fan was just as loud as the OEM fan that I thought was defective. Costed about $20.

    The Evergreen fan has 3 pins and a molex and pushed more air and was noisy even after the initial blast off.

    The Tivo HD is placed in a standing shelf which also contains my receiver, BD player, Media player and HD etc...Unhappily it's in my BR and I am a light sleeper so I am particularly sensitive to noise.

    My net is I am still looking for that quiet fan for the TivoHD.

    My Premiere OEM fan is quieter than the Evercool fan.
     
  16. unitron

    unitron Active Member

    16,390
    2
    Apr 28, 2006
    semi-coastal NC
    Perhaps thin little rubber washers, 2 per fan screw, one outside the case, one inside.

    Peel back the label on the non-blade side and check for adequate lubrication.

    I recommend a mixture of light grease and light oil (like sewing machine oil or 3-in-1).
     
  17. husky55

    husky55 Member

    175
    0
    Feb 2, 2008
    Madison, CT
    Thanks for the suggestions. You inspired me, so I will take out the Evercool today and put the Cofan or JMC back on with lithium grease and 3-in-1 oil and see what happens.
     
  18. MeInDallas

    MeInDallas Member

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    Jul 31, 2011
    Dallas, Texas
    OK, I remember these things now and I never thought about this but its an extremely great idea! I used these things on my 1980 Camaro :D

    My creative ideas are going crazy now! I've already got the cover off looking at how I can do this thing. A HUGE THANK YOU FOR THIS IDEA! :up:
     

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  19. unitron

    unitron Active Member

    16,390
    2
    Apr 28, 2006
    semi-coastal NC
    That's not quite the one I was describing.

    That one does insulation piercing on both wires, and you have to take it apart to unhook the added wire.

    What I'm talking about has apparently come to be known as a Scotchlock T-tap.

    Here's a page with a good illustration of them I found through Google images.

    http://tech.bareasschoppers.com/resources/the-problem-with-wire-tap-connectors/

    I mention how I found it so as not to mislead anyone into thinking I ride or otherwise know anything about motorcycles.

    As you can see, you choose the T-tap according to the gauge of the wire you'll be tapping into, and can choose a male plug with a barrel sized for the wire you'll be doing the tapping with.

    Since fan leads are usually about half as big around as drive power leads, this works out better than the side by side, both wires the same gauge, type in your picture.

    Electrically, it's pretty much the same deal.

    It was your picture of the wire bundle running back to the power supply that triggered my memory of the T-tap.

    So you can put away the soldering iron, and get out the crimping tool (for the male disconnect to go on the fan wire).:D
     
  20. MeInDallas

    MeInDallas Member

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    0
    Jul 31, 2011
    Dallas, Texas
    OK this is great! I found these on Amazon for under $3 for a set of 4 matched. This will be perfect! Thank you so much for your help!!! :D
     

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