[LED] Would a LED die shorting or opening itself?

[Mr. Man-wai Chang]

Talking about LEDs that reach its end of life....

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[Mr. Man-wai Chang]

On 5/08/2013 11:07 PM, Mr. Man-wai Chang wrote:

Talking about LEDs that reach its end of life....

Forgot to say my question is about 3mm/5mm LEDs, not big, powerful LED
bulbs!

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[Mark Storkamp]

In article <ktoepo$cpl$1@dont-email.me>,
"Mr. Man-wai Chang" <toylet.toylet@gmail.com> wrote:

On 5/08/2013 11:07 PM, Mr. Man-wai Chang wrote:

Talking about LEDs that reach its end of life....


Forgot to say my question is about 3mm/5mm LEDs, not big, powerful LED
bulbs!

Short answer: yes.

Long answer:
http://en.wikipedia.org/wiki/List_of_LED_failure_modes

 

[Mr. Man-wai Chang]

On 5/08/2013 11:41 PM, Mark Storkamp wrote:

Short answer: yes.

Long answer:
http://en.wikipedia.org/wiki/List_of_LED_failure_modes

Quote from that website:

Short circuits Mechanical stresses, high currents, and corrosive
environment can lead to formation of whiskers, causing short circuits.

Doesn't smell like normal use.

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[Daniel Pitts]

On 8/5/13 9:04 AM, Mr. Man-wai Chang wrote:

On 5/08/2013 11:41 PM, Mark Storkamp wrote:
Short answer: yes.

Long answer:
http://en.wikipedia.org/wiki/List_of_LED_failure_modes


Quote from that website:

Short circuits Mechanical stresses, high currents, and corrosive
environment can lead to formation of whiskers, causing short circuits.

Doesn't smell like normal use.

Well, high currents can ensue if you fail to use a current-limiter of

some sort; this includes the cheapest possible current limiter: a resistor.

Corrosive environment includes ones with oxygen.

Mechanical stresses includes any place which might have vibrations,
which is almost anywhere.

Normal use shouldn't smell. If it smells, it's likely you've forgotten
to limit the current ;-).

 

[passerby]

responding to
http://www.electrondepot.com/electronics/led-would-a-led-die-shorting-or-opening-itself-125490-.htm
, passerby wrote:

toylet.toylet wrote:


Talking about LEDs that reach its end of life....

Never seen an LED dying while not opening itself. Wouldn't that be something
if it died by closing and the serial circuit of LEDs would continue to work
(albeit slightly brighter)! That would be the answer to all LED lighting
repair problems... Never happens.

--

 

[Mr. Man-wai Chang]

On 6/08/2013 1:18 AM, passerby wrote:

Never seen an LED dying while not opening itself. Wouldn't that be
something
if it died by closing and the serial circuit of LEDs would continue to work
(albeit slightly brighter)! That would be the answer to all LED lighting
repair problems... Never happens.

I suspect few, including me, would ever actually see a LED dying
normally. The equipment might have been upgraded or replaced before that.

--
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/ v \ Simplicity is Beauty! May the Force and farces be with you!
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[Mr. Man-wai Chang]

On 6/08/2013 12:38 AM, Daniel Pitts wrote:

Well, high currents can ensue if you fail to use a current-limiter of
some sort; this includes the cheapest possible current limiter: a resistor.

Since it's just a toy circuit, it would not happen. The DC in would not
fluctuate much, I suspect....

Corrosive environment includes ones with oxygen.
Mechanical stresses includes any place which might have vibrations,
which is almost anywhere.
Normal use shouldn't smell. If it smells, it's likely you've forgotten
to limit the current ;-).

Not for my toy, could be common for real cars...

--
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