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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

#101 OFFLINE   veryoldschool

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Posted 08 September 2012 - 11:52 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?

"Common sense" of failures would suggest you're 100% correct.
Without inspecting the failed unit, we simply don't know for sure.

I've been running these 2 DECAs for well over an hour and they haven't changed.

The coldest part of them is where the burnt coax is shown.

I can't stop those that want to worry, from doing so, but I find absolutely no indication that the heat from a DECA was the cause of this failure.
A.K.A VOS

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#102 OFFLINE   veryoldschool

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Posted 08 September 2012 - 11:54 AM

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.

The SAT input port current isn't over .5 amps
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#103 OFFLINE   dennisj00

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Posted 08 September 2012 - 11:57 AM

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.


Then I would say that it was a rare combination of a coax short and a HR power supply regulation chip that didn't shut down.

The PI that I have powering a DECA for my Nomad connection is completely cold on the DC side connection. Both it and a DECA on my HR20 are warmest, but not hot, on the coax input side.

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#104 OFFLINE   dennisj00

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Posted 08 September 2012 - 12:03 PM

"Common sense" of failures would suggest you're 100% correct.
Without inspecting the failed unit, we simply don't know for sure.

I've been running these 2 DECAs for well over an hour and they haven't changed.

The coldest part of them is where the burnt coax is shown.

I can't stop those that want to worry, from doing so, but I find absolutely no indication that the heat from a DECA was the cause of this failure.


I posted the above before seeing this but I totally agree.

We have many more 'worry' points in the average house!

I just found a problem last week that a licensed electrician (and inspector) put a 100 amp breaker (and an extra 20-25 amps of load) behind a 50 amp breaker in my panel. Nothing flamed, just failed as designed.

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DLB, MRV, nomad, HDGUI are HERE! . . . We're DONE!


#105 OFFLINE   veryoldschool

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Posted 08 September 2012 - 01:35 PM

After 3 hours, I'm pulling the plug on this test.

The power side connector(s) are so cool as to barely feel any warmth, while the other end is on the hot side of warm, but I can still hold the connector with my hand as long as I want.
A.K.A VOS

#106 OFFLINE   P Smith

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Posted 08 September 2012 - 01:38 PM

Any chance to measure the temp ?

#107 OFFLINE   P Smith

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Posted 08 September 2012 - 01:39 PM

The SAT input port current isn't over .5 amps


The three legacy LNBFs would rake the load up to 750 mA. Adding WB68 (what was common before SWiM) would add more, that why I put 1+ A above.

#108 OFFLINE   veryoldschool

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Posted 08 September 2012 - 02:00 PM

The three legacy LNBFs would rake the load up to 750 mA.

Multi-switches are rated @ 350-450 mA, and a receiver is only powering one LNB/input with legacy.
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#109 OFFLINE   veryoldschool

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Posted 08 September 2012 - 02:01 PM

Any chance to measure the temp ?

I wish I had something better than my touch/hand, but I don't.
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#110 OFFLINE   P Smith

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Posted 08 September 2012 - 02:10 PM

Multi-switches are rated @ 350-450 mA, and a receiver is only powering one LNB/input with legacy.

If it HR2x ?

Wouldn't Multi-switches require own load ?

BTW, mono-block ( multi LNBF build) has powered all LNBFs all circuitry simultaneously. And I'm doubtful if WB68 doesn't powering all separate LNBFs (up to 6 ! ) same time.

#111 OFFLINE   Go Beavs

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Posted 08 September 2012 - 11:36 PM

I took this picture with an infrared camera a while ago. It's a receiver DECA with the DECA power (receiver side) on the left. The line through the connector is a CAT5e line laying across it.

Receiver DECA.jpg

As you can see, the hot spot is in the center of the unit.

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#112 OFFLINE   P Smith

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Posted 09 September 2012 - 12:08 AM

I see also see suspicious red spot on right side up on coax connector ...


[Recognizing it was FLIRT camera]

#113 OFFLINE   tbolt

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Posted 09 September 2012 - 10:47 AM

I took this picture with an infrared camera a while ago. It's a receiver DECA with the DECA power (receiver side) on the left. The line through the connector is a CAT5e line laying across it.

[ATTACH]29939[/ATTACH]

As you can see, the hot spot is in the center of the unit.



The measurements I took agree closely with yours.

I used an Infra Red Temperature probe - $20 Harbor Freight Tools.

White DECA box measured 95F on the Coax Input and 105F in the middle.

Black DECA 2 box measured 96F on the Coax Input and 106F in the middle.

#114 OFFLINE   scb2k

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Posted 02 October 2012 - 02:18 PM

I have three of these set up in my house. I'm now a bit concerned and second guessing whether WHOLE HOME is worth the risk of a potential fire.

BubblePuppy, I'm glad to read that your family and belonging are okay. Thank you for bringing this to our attention.

#115 OFFLINE   inkahauts

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Posted 02 October 2012 - 02:28 PM

I have three of these set up in my house. I'm now a bit concerned and second guessing whether WHOLE HOME is worth the risk of a potential fire.

BubblePuppy, I'm glad to read that your family and belonging are okay. Thank you for bringing this to our attention.


If you read through the thread, it doesn't look like the bbdeca had anything to do with the burning up of the cable, but that the cable was bad.

#116 OFFLINE   P Smith

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Posted 02 October 2012 - 02:39 PM

If you read through the thread, it doesn't look like the bbdeca had anything to do with the burning up of the cable, but that the cable was bad.

Did you receive real DTV failure report for the OP case ? Or just speculating?

#117 OFFLINE   BubblePuppy

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Posted 02 October 2012 - 03:18 PM

I guess I should update this with there really isn't much of a update. Clayton arrived from LA and had checked all of the outside connections and was starting on the inside when I arrived home from work. He checked every single connection, checked the electrical outlet and the power strip. He even ran some diagnostics on the setup with some weird grid displays on the tv. Everything was fine.
Looking at the Deca there was a very small spot on the band close to the Deca that sort of looked like where a metal to metal contact might have been made that produced a short or spark. However there was nothing metallic anywhere close to have caused that.
Clayton didn't think the Deca unit caused the fire, could have been some anomalies in the output from the HR20, defective wiring construction in the connecting cable, or a number of things that came together to produce this. If you read my time frame the cause of this didn't happen suddenly, the deterioration was occurring over a long period of time with observable effects (of course only realized this after the fact).
Clayton took the the Deca pieces and the HR20 with him to LA for the autopsy.
Maybe he will let me know the outcome and maybe not.
But like he said that this is the first and only instance of this happening, so I wouldn't over react to it. Just make sure there isn't any chance of a metal to metal short or arc happening, keep all bends shallow.
If I know anymore I'll update again.

Edited by BubblePuppy, 02 October 2012 - 03:30 PM.

Thanks to Google search, people can appear to be smarter than they really are.

#118 OFFLINE   veryoldschool

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Posted 02 October 2012 - 03:24 PM

maybe "turn off"/stanby the dvrs when not watching tv.

Would be pointless because the DECA stays powered.
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#119 OFFLINE   Carl Spock

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Posted 02 October 2012 - 03:26 PM

I have three of these set up in my house. I'm now a bit concerned and second guessing whether WHOLE HOME is worth the risk of a potential fire.

If you are going to be this concerned about potential fires, you'll never get in a car again. Vehicle fires happen much more frequently that BubblePuppy's problem. From 2002 to 2005, there were an average of 305,800 vehicle fires per year, causing on average 520 deaths and 1,640 injuries. link

In BP's case, there was one fire that caused no deaths or injuries.

So, in other words, if you have to travel from Chicago to Los Angeles, take a DECA, not a car. :grin:
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#120 OFFLINE   BubblePuppy

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Posted 02 October 2012 - 03:28 PM

Would be pointless because the DECA stays powered.

That's true...my error, not Claytons. Hmm...now where is that edit button.
Thanks to Google search, people can appear to be smarter than they really are.




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