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Guest Message by DevFuse

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My Deca unit caught on FIRE!


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143 replies to this topic

#81 OFFLINE   P Smith

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Posted 31 August 2012 - 10:52 AM

Well, you are overreacting to my posts ... I did propose to check DECA boxes temperature for now.

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#82 OFFLINE   BubblePuppy

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Posted 31 August 2012 - 11:08 AM

Have 3 of these installed in the kids rooms. Every room has a smoke detector, but still makes me nervous. HR20-700 has been acting up lately losing signal where I have to remove power cord? Hope it's not related to deca unit.:eek2:


As I posted there appeared to be three indicators that something was amiss:
1. Video break up and pixalation during clear days/nights. ( I can't be sure this was caused by the deca connector going out)
2. When turning on the tv there would be the notice that "communication with the satellite was lost", but that was the only indication as the video was fine and the buffer full.
3. Consistent loss of home network connection.
In that order. It was about a couple of month between item 1 and two, about a month between 2 & 3, and a day between 3 and the combustion.

In the words of the great detective: "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."

So I would first assume that your problem might be at the satellite dish or a connection. Have a tech come out and check the alignment and connections.
If that is ok and you still have issues you can switch deca units (if you have more than one) and see if the problem follows the unit in question, maybe have the tech bring out a replacement when they are going to check the dish.
If the problem does follow the unit then I would call Directv and bypass the script talkers and talk to a real tech. I'm sure my issue has made the rounds.

Edited by BubblePuppy, 31 August 2012 - 12:40 PM.

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#83 OFFLINE   west99999

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Posted 07 September 2012 - 08:10 PM

Well any update on this?

#84 OFFLINE   P Smith

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Posted 07 September 2012 - 08:43 PM

Still smelling like a sh&$&% ! :D

#85 OFFLINE   mweldridge

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Posted 07 September 2012 - 09:40 PM

I had 3 DECA units installed about 1 month ago. I saw this post and just checked all 3. They are very warn at the end where the coax feed is attached. Now I'm concerned.....

#86 OFFLINE   veryoldschool

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Posted 07 September 2012 - 10:39 PM

I had 3 DECA units installed about 1 month ago. I saw this post and just checked all 3. They are very warn at the end where the coax feed is attached. Now I'm concerned.....

If it's not on the pigtail to the receiver, the warmth comes from it being a 1 milliwatt RF transmitter.
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#87 OFFLINE   P Smith

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Posted 07 September 2012 - 11:10 PM

I don't think 1 mW will rise the temp to warmth status ...

#88 OFFLINE   veryoldschool

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Posted 07 September 2012 - 11:30 PM

I don't think 1 mW will rise the temp to warmth status ...

Do you have one to know/feel?
Since I have, it's fairly clear.
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#89 OFFLINE   P Smith

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Posted 07 September 2012 - 11:57 PM

By law of thermodynamic and Ohm's law... the very low energy will dissipate to surrounding air faster then produce the temp. Try to make an experiment - get a resistor and power source - calcualte it for say 5V: P=I*U=U*U/R = 25/R=1 mW, where R=25 kOhm. Now tell me what temp the resistor will be ?

#90 OFFLINE   veryoldschool

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Posted 08 September 2012 - 06:27 AM

By law of thermodynamic and Ohm's law... the very low energy will dissipate to surrounding air faster then produce the temp.

What air?
The output connector on the white DECA is the heat sink, and gets warm.
The WCCK is larger and its output doesn't get as warm, but is warm.
I'm sure it's the law of thermodynamics, but doubt it's Ohm's.
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#91 OFFLINE   P Smith

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Posted 08 September 2012 - 08:52 AM

For generating the calories - yes. It's P [1mW], and try the 24 kOhm resistor (I'm sure you'll will not feel it warm ).

#92 OFFLINE   dondude32

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Posted 08 September 2012 - 09:02 AM

My 3 deca's are warm. Here's a link where some users find them very warm.
http://www.dbstalk.c...ad.php?t=206149

#93 OFFLINE   veryoldschool

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Posted 08 September 2012 - 09:45 AM

For generating the calories - yes. It's P [1mW], and try the 24 kOhm resistor (I'm sure you'll will not feel it warm ).

"the power source" needs to be RF and just like a power meter that uses a thermistor, heat is generated.
The DECAs use the input connector as a heat sink. The WCCK has more mass so its input isn't as warm, but the unit overall feels like it too generates as much heat.
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#94 OFFLINE   veryoldschool

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Posted 08 September 2012 - 09:50 AM

some users find them very warm.

Too bad this can't be quantified.
What is "too warm" for one person may not be for another.

I've never found any of mine to be "too warm to touch", but yes they do get warm.
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#95 OFFLINE   veryoldschool

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Posted 08 September 2012 - 10:44 AM

I setup a couple of DECAs to see where and how much warmth comes out.

I don't find ANYTHING that would relate to the original burned up DECA here:

http://www.dbstalk.c...=1&d=1347122633

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#96 OFFLINE   dennisj00

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Posted 08 September 2012 - 11:09 AM

Just throwing my 2 cents here . . wouldn't this just be a short on the coax of the DC supply from the HR to the DECA . . . what size fuse is in the HRxx supplying DC to the coax port?

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#97 OFFLINE   Laxguy

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Posted 08 September 2012 - 11:24 AM

Any update?
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#98 OFFLINE   Laxguy

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Posted 08 September 2012 - 11:38 AM

I setup a couple of DECAs to see where and how much warmth comes out.

I don't find ANYTHING that would relate to the original burned up DECA here:


Nor do I. My DECA is warmest in the middle of the bottom side (near where the shortest arrow is). Both ferrules are warm, but not to the point of being difficult to touch for extended periods.

Folks who stack components are literally playing with fire.
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#99 OFFLINE   P Smith

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Posted 08 September 2012 - 11:40 AM

Just throwing my 2 cents here . . wouldn't this just be a short on the coax of the DC supply from the HR to the DECA . . . what size fuse is in the HRxx supplying DC to the coax port?


There is no fuse, it would be a regulation chip what is monitoring a current and will shut it off if it goes high than 1-2(?) A.

#100 OFFLINE   P Smith

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Posted 08 September 2012 - 11:42 AM

Nor do I. My DECA is warmest in the middle of the bottom side (near where the shortest arrow is). Both ferrules are warm, but not to the point of being difficult to touch for extended periods.

Folks who stack components are literally playing with fire.


I'm very skeptical about the "1 mW" power, it must be more than 1/2 W to get the box warm. Perhaps it's DC circuit , not RF as VOS mentioned.
Who have it open ?




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