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Guest Message by DevFuse

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942 Cooling Fan Speed?


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31 replies to this topic

#26 OFFLINE   wkomorow

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Posted 27 June 2006 - 09:45 AM

Jerry -

Any chance that your mini-fans are creating white noise that is absorbing some of the fan noise from the 942. BTW, my 942 fan has been fine over the last few days.

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#27 OFFLINE   Jerry 42

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Posted 28 June 2006 - 10:18 AM

wkomorow

Anything is possible. I my case the high fan speed noise stopped and the internal fan speed/noise when down to the old speed/noise about 2 seconds after I turn on external fan. BTW the external fan noise rating is 12 dbs which is very low so it is unlikely to cover any other noise,

It may be the air flow/movement inside the 942 some how increase and that self corrected the internal 942 speed control. I was just thinking that this "issue" seemed to arise around the time of a previous Dish solfware, BUT it was also the time our general temps went up as we approached spring/summer. Perhaps that had some effect on the 942 internal temp fan controller. Do you / anybody have their 942s near an a/c vent that might cool the outside air enough for the 942?

An other idea which I have not tried as I not sure its wise or safe for the components of the 942, is to use compressed air and blow the air into the 942 and see if it cleans out and dust etc that might be blocking something and causing the internal fan to run at the high rate.

As I have had both 942s since the first month they were released and never had this "issue" before, I do not believe "its normal" as the CS supervisors said. The 942s are IMO good machines - I replaced 2 TiVos with them. I want to keep them going and operating as they did when I first got them.

Good luck with whatever to do.

#28 OFFLINE   scn101

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Posted 25 September 2006 - 10:12 AM

Over the past month I've noticed that my 942's fan often runs at full speed. The box is very cool to the touch and is in an open area. I've had the 942 for over a year and its never run the fan at full speed continuously. It is mounted on 1/2" spacers for better airflow.

If I do a soft reboot or a power line reboot the fan speed restarts at full speed for about 20-30 seconds and then slows down to a "normal" speed. It remains at a variable low to medium speed for a day or two and then locks on high speed again. I usually notice the high fan speed first thing in the morning, so I think it locks on high speed sometime during the early morning hours.

Since the box is cool I suspect either a temperature sensor failure or perhaps it is software related. Anyways, I think Dish might want to look into this.

#29 OFFLINE   lakebum431

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Posted 28 September 2006 - 07:37 PM

What are your high, low, and average temps? Go to menu 6-3-Counters to check.

#30 OFFLINE   scn101

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Posted 30 September 2006 - 10:51 AM

What are your high, low, and average temps? Go to menu 6-3-Counters to check.


Fairly cool I think at: 118F High, 93F Low, 111F Average

#31 OFFLINE   lakebum431

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Posted 30 September 2006 - 12:07 PM

Yeah, those look good. The fan should not be running full time. Looks like it might be time to replace that sucker with a brand new 622 :)

#32 OFFLINE   scn101

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Posted 21 October 2006 - 03:24 PM

Well I finally had enough of listening to my 942's fan sounding like a jet engine. The only way to have the fan return to a normal speed and sound was to either do a power cord or soft reboot. The fan would then settle down and run normally for a few hours but always returned to high speed. This process was getting old and kind of annoying.

The case was cool to the touch. The 942 was on a open shelf, on riser spacers, in a cool room with no heat sources anywhere near it. No way was the fast fan needed. Besides, it never did this over the previous 12 or so months. Something must be wrong. In addition, I was having issues with the 942 responding to the remote, sometimes it would, other times it wouldn't.

So I decided to open the box. Hey, maybe some dust was clogging it? Opened it, no dust, no dirt. But I did find a TO-220 package split open down its middle. It was a LM340T12, a 12V postiive linear voltage regulator. VR9 on the PCB. As luck would have it, I had a 7812 spare (part of my hobby repairing pinballs and pretty much identical to a LM340T12). I removed the offending device and noted that it had almost no thermal grease between it and its heatsink. This may explain why it failed, simply got too hot. Put some thermal grease between it and the heatsink and soldered in the 7812. Put it all back together as I had to completely remove the motherboard, harddrive, and power supply card.

That was three days ago. Ever since the fan has been running between low and medium speeds. No more jet engine sounds. And the remote is working properly again. Anecdotal, but the two issue may of been related? I can't be sure because I don't have the schematics to the 942. If anyone does, please send me a copy.

Not sure if my 942 was an isolated incident but I thought I'd share the experience.

Happy again with my 942.




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