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Discussion in 'TiVo Bolt DVR/Streamer' started by ilovedvrs, Oct 8, 2015.
Feels like a piling on of Howard Wolowitz.
2004 article discussing 2-wire fans and low frequency PWM (and other forms of fan speed control with advantages and disadvantages.)
Why and How to Control Fan Speed for Cooling Electronic Equipment | Analog Devices
If we assumed that the 4-pin header could actually work for a PWM fan, does anyone know if a quiet, 4-wire PWM fan exists in the correct size? I did some quick searching earlier, and wasn't coming up with much for 50mm PWM fans.
My Noiseblocker XS-2 fan arrived the other day, though my Bolt still hasn't shipped yet. To get a sense of how loud the fan is, I fired it up tonight.
I used a variable-voltage power supply, so I tried feeding it a range from 5V, up to 12V. It will likely seem louder when mounted in the Bolt's case (resonance, airflow noise, etc), but I was very pleasantly surprised at how quiet it is. At 5V it was effectively silent. Even at 12V, I still had to get quite close to fan to really hear it. It certainly didn't give the impression of something that would be noticeable across the room.
So if there's a good 12V source inside the case, I might try to simply power it that way. From my brief test (not perfect, certainly), it doesn't seem like it would be loud even running full-speed at a constant 12V. And it would completely avoid the electronic buzzing sound from the board, courtesy of not using the 2-pin fan header.
Worst-case, I could try to draw power from something else, even a second external 12V supply. I'd prefer to avoid making any permanent changes inside the Bolt, such as soldering to something. I can check for 12V on those 4-pin headers, but then it's a question of whether they're capable of actually powering a fan safely (I have no idea what's feeding them, and what current draw they can handle).
If I got a male and female set of the proper round plugs, I suppose I could make a "pass-through" for the stock power supply's output. Something I could put between the PS output and the Bolt, allowing me to tap into the 12V from the normal power supply. This would avoid one risk of using a 2nd supply for the fan, which is the second supply failing, shutting off the fan, while leaving the Bolt running.
If you find the right plug, please post here. The 5V USB is keeping my Bolt safe at 61, by I like your thinking. Agree with the noise of the XS2 fan. To me the hard drive gives off more noise than the fan.
This thread references a BenQ monitor power supply, which someone said he used for his Bolt:
Alternate power adapter for bolt
That eBay listing shows a plug size of:
"DC connecter size: internal diameter: 2.5mm, external diameter: 5.5mm"
I don't yet have a supply to measure. But assuming that's correct, this looks like it could work as a $6 female-to-male extension, which could provide a means to non-destructively tap into the stock supply's output, to draw power from it:
"5' ft DC Power Extension 2.5mm X 5.5mm Cord/Cable CCTV Extender Male to Female"
5' ft DC Power Extension 2.5mm X 5.5mm Cord/Cable CCTV Extender Male to Female
Or, on Amazon, with free shipping (over a certain order amount, and not eligible for Prime, sadly), $3:
Amazon.com : kenable 5.5 x 2.5mm DC Power Plug to Socket CCTV Extension Lead Cable 1.5m (~5 feet) : Camera & Photo
I've read all the posts and might have missed it but has someone documented all the steps to replace the fan?
There really isn't much to it. Remove the two pin fan connector from the motherboard. Remove the two screws attaching the fan. Then pry the adapter off of the fan and clip it onto the new fan.
And if I remember correctly, the 3 pin XS-2 fan connector had the unused wired on the side of the fan.
And I put the extra cable from the new fan on top of the hard drive. Since the wire to the power connector is so long. Not sure what other people did with it. But that seemed like the only place I had space for it.
I followed the same steps as arronwt describes. The only other trick is the little wireless board stuck to the side of the fan. You have to pull it loose before you can access the screw underneath. I used a spudger (though a butter knife would suffice) to pull the stretchy adhesive away from the fan while keeping it attached to the foam block. Keep the adhesive clear of dust and debris while you replace the fan, and it should stick back onto the new fan pretty well.
One thing I forgot to do was snap some photos of everything before I started futzing with it! It's always helpful to have a record of the original configuration.
I forgot about that wireless board. It comes off very easily if the TiVo is still hot. And can also be easily put back on. If the TiVo has been off awhile and is cold, removal and replacement will be an issue.