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942 Cooling Fan Speed?
Posted 03 June 2006 - 10:50 AM
However, for the past couple of days the cooling fan continuously runs at high speed, even in standby. The 942 is not enclosed in a cabinet.
Doing a search for info on the 942’s cooling fan on this forum, I found several threads that mentioned overheating conditions. In a thread started by Gutter back on May 25, 2005, he put ¼” spacers under the feet of the 942 to aid cooling. (He had an overtemp warning of 147 degrees.)
I took Gutter’s idea and put 1” thick rubber spacers under the feet on my unit. The temperature drop of the 942’s housing was VERY significant! The heat given off from the vents on the left side was greatly reduced and the exhaust fan on the bottom almost feels like it’s now blowing cold air.
However, the cooling fan is still continuously running at high speed (in standby) and is quite audible from our normal seating location in our HT. Will check the internal temperature when I fire the unit up tonight.
Otherwise, my 942 works GREAT!
Thanks to all the contributors on this excellent forum!
Posted 03 June 2006 - 11:20 AM
It is good to mention the cooling benefits of some kind of spacers to those who were not reading this forum a long time ago.
As for your fan running full steam all the time, have you tried a power cord reboot? Does the fan run full hog when you are viewing tv or just in standby?
Posted 03 June 2006 - 12:41 PM
Sounds like you were already clued-in to this cooling tip. Cool! (Pun intended) And yes, forums like dbstalk.com contain so much info from so many people that it's good to go back in time every so often using the search function.
To answer your question, the cooling fan has been running at high speed continuously for the past two days, both when "on" and in "standby". It hasn't changed speed / audible output for two days. Previously, you could easily hear it cycle slow / fast.
I did take your suggestion and performed a power cord reboot. After plugging the 942 back in, the fan ran at high speed for 20-30 seconds and then was quiet. A green light on the front panel came on for a few minutes and I could also hear the HD spin up. After a few minutes, the green light went out and all I could hear was the HD.
Checking underneath the 942, I could feel no cooling fan discharge. I propped the unit up and looked -- the cooling fan blades are not turning! I've never seen or heard this before on my 942.
The left side is a little warm, but significantly cooler than it was before "putting it up on blocks".
Our HT is 67 degrees right now (it's below ground level), so I'm guessing that the cooling was so effective after giving it more air that the fan doesn't need to run. I thought that the cooling fan was supposed to run all of the time, changing speeds as needed to prevent the internal temperature from exceeding a certain limit.
Sorry, I don't have a TV on right now (I'm too busy chasing moles around the yard), but will see if turning the unit on tonight causes the cooling fan to kick on. Will also check the temp under diagnostics.
Thanks for your input! I really appreciate it!
Posted 03 June 2006 - 01:05 PM
Posted 03 June 2006 - 04:10 PM
Thank you too for the tip. It appears to be a very easy fix for a number of wacky electronic maladies with the 942.
Posted 03 June 2006 - 11:29 PM
It gets plenty of ventilation as it sits on a wire mesh rack with a few inches below to the DVD player which is rarely on. The unit doesn't feel the least bit warm on any side.
I left it unplugged for about 12 hours overnight and it was running back in it's original state for a few hours. But it has since returned to the high speed and volume.
Is there a chance that the latest software update could have caused this? The timing is suspect.
Any thoughts would be much appreciated!
Posted 04 June 2006 - 09:35 AM
Posted 04 June 2006 - 10:40 AM
Posted 04 June 2006 - 12:40 PM
Posted 04 June 2006 - 02:33 PM
I'm not surprised that it's not happening to everyone, but I'm ever so slightly comforted that I'm not the only one.
Is it coincidence that I got the call the day before the fan change to upgrade to the 622?
Posted 05 June 2006 - 08:56 AM
Like dogday, I too wonder if it is 287-related...
What's now weird is that the cooling fan either runs at high speed or is totally off, both in standby and when on.
When the fan is roaring away, the entire box is cool to the touch. When the fan is off, the left side is warm.
Audio / video = no problems.
Posted 06 June 2006 - 07:47 PM
Posted 09 June 2006 - 10:35 AM
Sounds to me due to the number od complaints from other users that this must of been caused by a software update. So until they fix it, I will have to reboot it when I want to use it.
Posted 11 June 2006 - 10:19 AM
I have 1/2 inch bumpers under each for all the time I had them - about 18 months. The high fan speed problem just started to ocurr about a month ago.
After reading this helpful thread I did a power cord restart and it seem to fix problem but I do not know for how long yet. (PS did a power button reset first but it did not fix it need the power cord reset)
Posted 11 June 2006 - 11:14 AM
The power cord "fix" of last night was unfixed this morning. Doing a power cord reset this morning seems to again "fix" the problem. As noted by others it would seem to be in some way related to the 3 AM EPG download.
Still find it odd that it only seems to affect only on of the 2 - 942s (always the same one.
Posted 11 June 2006 - 06:04 PM
Posted 12 June 2006 - 08:33 AM
The problem (issue) is back on the 942 that had the problem. The other 942 never had/has this problem.
Posted 12 June 2006 - 02:37 PM
Some of us are more sensitive to whirring / whooshing noises than others. Some HT enthusiasts even purchase front projectors, amps, etc. that are the quietest available so as to not detract from the quieter passages in movies and music. When my now-noisier 942 is churning away, it makes FAR more noise than my front projector or my fan-cooled amp. This is really distracting!
Enclosing this 942 wind machine is certainly possible, but I’m hoping for an L2.88 fix.
Posted 13 June 2006 - 06:37 AM
Not sure it is necessarily a bug. Could be an attempt to help with overheating issues some have had. It does not bother me, but I could see where those with a 942 in their bedroom could get annoyed.
Posted 23 June 2006 - 06:24 PM
I've been out of town for the past several weeks and came home to find my fan still running full-tilt all the time (except for the occasional stoppage in middle of the night when the box is off - during software downloads perhaps?).
I hate having to call tech support, but getting a bit tired of the noise.
Posted 25 June 2006 - 12:15 PM
I brought a small very quiet computer case fan that operates on 12 DCV at .08 ampere. From the various old DC transforms (used a 12dvc 300 mA) I have around I cut the DC side output wires and connected the two fan wires to the the transformer. (note if the fan does not work switch the two wires as poles are important here)
I placed the fan outside the left side of the 942 case by the vents with flow going away from 942 and immediately the 942's fan speed dropped to the lower quieter rate.
This my not be the answer that everyone is looking for - but the exterior fan and the lower 942 fan noise together is substandially quieter than the 942's fan running at the higher speed.
This works with both my 942s - one fan each. I got both fans as package for less than $12. Just be sure to check the "db" noise ratings of the fan(s).
Just a suggestion.
Posted 25 June 2006 - 05:01 PM
Excellent post and might be a fairly inexpensive solution for some until it corrected via software (if that is a possibility).
Posted 26 June 2006 - 09:38 PM
There is plenty of ventilation on all sides of the unit and the room temp is kept nice and cool thanks to a/c. It simply seems that the fan is just on - and the timing corresponds exactly with the last sw update.
guess it's time to call tech support. what time is it in India??
Posted 26 June 2006 - 10:59 PM
My 942's were not running hot either. There is more than 4 feet of space on front and both sides and I have them sitting on rubber spacers that makes an extra 1+ 1/2 inch clearance under the units. I do not know the final answer but perhaps air is not moving from inside the 942 case to outside fast enough and the exterior fan pulls out extra air from the 942s.
One 942 is in the bedroom and my wife was saying how much noise there was late at night. Now with the fan the noise 80% quieter.
PS before going the fan route I called tech support and even got to supervisors in US. Their response on the fan noise was "its normal". So good luck with TS. My guess is 942 fixes are less important to DIsh now that the MPEG 4 boxes are out and they want you to trade up.
Posted 27 June 2006 - 08:32 AM
My guess is 942 fixes are less important to DIsh now that the MPEG 4 boxes are out and they want you to trade up.
This couldn't be further from the truth. Dish is still very interested in the 942 and will take care of this if it turns out to be software related. They care and are on top of things.