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Re: Replacement LED?

Cross-posted to 4 groups.

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On 22/03/2016 05:56, DaveC wrote:
>> I beg to differ with your diagnosis. Unless the LED has magically
>> turned into a thermostat controlled flasher, it's not going to do
>> that. More likely, the LED driver circuit is doing the flashing.
>> Based on zero detail about the actual flashlight, my wild guess(tm)
>> would be the big electrolytic that usually goes across the battery.
>> Broken or badly soldered connections on the driver PCB are also
>> likely.
>
> Nebo NU15J:
>
> https://www.nebotools.com/prod_details.php?id=31&cid=16&subid=94&subsubcid=
>
> I like this model for its good trade-off between brightness and battery life.
> Might be “better”, but this fits my needs. (And it ft fits in my pocket
> along with my micro Swiss army knife...)
>
> No controller chip. Looks like a boost converter (inductor, BJT, schottky
> diode, ceramic cap).
>
> I scoped the voltage across the LED: it's constant 4v (with a very
> small--20mv?--rise and fall as it switches on and off). Haven’t yet
> measured current. Surely if there was a bad solder joint or other failure it
> would show up here.
>
> Thanks for the referrals of other lights, but I’m not buying a replacement.
> I’m doing this for fun and to learn.
>
> Cheers.
>

Desolder the original LED, carefully , as balance of probability it will 
be fine.
Jumper in any old high power LED and see if that flashes too.

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Thread

Replacement LED? DaveC <not@home.cow> - 2016-03-21 10:30 -0700
  Re: Replacement LED? Bob Engelhardt <BobEngelhardt@comcast.net> - 2016-03-21 17:00 -0400
  Re: Replacement LED? John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-21 20:05 -0700
  Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-21 20:51 -0700
    Re: Replacement LED? DaveC <not@home.cow> - 2016-03-21 22:56 -0700
      Re: Replacement LED? N_Cook <diverse@tcp.co.uk> - 2016-03-22 15:42 +0000
      Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-22 16:42 -0700
        Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 16:56 -0700
          Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-22 18:16 -0700
            Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 18:56 -0700
              Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-23 11:11 -0700
                Re: Replacement LED? DaveC <not@home.cow> - 2016-03-23 21:50 -0700
                Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-23 22:49 -0700
                Re: Replacement LED? DaveC <not@home.cow> - 2016-03-24 14:02 -0700
        Re: Replacement LED? not@telling.you.invalid (Computer Nerd Kev) - 2016-03-24 21:44 +0000
    Re: Replacement LED? Syd Rumpo <usenet@nononono.co.uk> - 2016-03-22 09:10 +0000
      Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 13:41 -0700
        Re: Replacement LED? rickman <gnuarm@gmail.com> - 2016-03-22 21:46 -0400
          Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 19:00 -0700
            Re: Replacement LED? rickman <gnuarm@gmail.com> - 2016-03-23 00:19 -0400
              Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 22:23 -0700
                Re: Replacement LED? DaveC <not@home.cow> - 2016-03-23 11:52 -0700
              Re: Replacement LED? "Ralph Mowery" <rmowery28146@earthlink.net> - 2016-03-23 10:31 -0400
    Re: Replacement LED? Andre Majorel <cheney@halliburton.com> - 2016-03-26 19:56 +0000
      Re: Replacement LED? John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-27 10:20 -0700
      Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-28 19:21 -0700
        Re: Replacement LED? "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-03-31 04:20 -0400
          Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-31 08:34 -0700
          Re: Replacement LED? krw <krw@nowhere.com> - 2016-03-31 20:10 -0400
            Re: Replacement LED? "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-04-01 17:21 -0400
              Re: Replacement LED? krw <krw@nowhere.com> - 2016-04-01 19:14 -0400
                Re: Replacement LED? "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-04-01 19:43 -0400
        Re: Replacement LED? Andre Majorel <cheney@halliburton.com> - 2016-03-31 10:40 +0000

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