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LED taillight issues...

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reed
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Joined: 28 Oct 2012
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PostPosted: 17:21 - 22 Nov 2013    Post subject: LED taillight issues... Reply with quote

Recently the LED tail light on my 1999 Hornet has been playing up, one half of it dies every now and then, now however it seems to have given up completely on that side, however if I take the cover off and touch part of the circuit board with my finger it comes back to life for a little while, it also comes back to life for a bit if I blow a heat gun at it for a few seconds, presumably as heat helps create a connection? It will always go back to only a single side working within a few hours though.

Does this mean I am required to buy a new one, or is there any way this can be permanently sorted? I'm thinking the issues is a bad earth?

Thanks.

This is how it looks after I have blown a heat gun at it...

https://i40.tinypic.com/n316y0.jpg
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jjdugen
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PostPosted: 17:40 - 22 Nov 2013    Post subject: Reply with quote

LEDS are wired in series, each LED has a safe working voltage of 3 - 3.5 volts. (So there are four to a 'cluster' 4x3=12).
You will probably find that one or more of the printed circuit lines has corroded or gone high resistance, just check each one with a magnifying glass. If the Leds light with some applied heat I would just run a new piece of wire to the failing rows.
Probably quicker and cheaper to give some more money to theChinks
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WD Forte
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PostPosted: 17:47 - 22 Nov 2013    Post subject: Reply with quote

As it has a common ground for all the leds I doubt its the earth/ground affecting only half the leds.
My guess is its a dry joint or crack on one of the tracks on the rear
Possibly near one the diodes. ( them black fings)
If you can remove the board and get at the back, a wee bit
of fresh soldering may sort it
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reed
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Joined: 28 Oct 2012
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PostPosted: 20:30 - 24 Nov 2013    Post subject: Reply with quote

Right, decided to get a new tail light, the issue is, when I unplug the current tail light, my rear indicators cease to work, however I don't believe the indicators are meant to be powered from the tail light wiring as standard? How would I go around powering the indicators when I put in the new tail light that only has wires to power itself?

Confused!
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doggone
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PostPosted: 21:05 - 24 Nov 2013    Post subject: Reply with quote

Are those four unlit LEDs in your pic the turn signals then? Thinking
If so I guess you will need separate units if the replacement isn't like that.
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reed
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PostPosted: 21:13 - 24 Nov 2013    Post subject: Reply with quote

doggone wrote:
Are those four unlit LEDs in your pic the turn signals then? Thinking
If so I guess you will need separate units if the replacement isn't like that.


They are, but they aren't in use as I don't like them, I have separate 'normal' indicators, this is the reason I'm confused as to why they run into the same wiring as the tail light.
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Vincent This post is not being displayed because the poster is banned. Unhide this post / all posts.

Im-a-Ridah
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PostPosted: 16:43 - 25 Nov 2013    Post subject: Reply with quote

jjdugen wrote:
LEDS are wired in series, each LED has a safe working voltage of 3 - 3.5 volts. (So there are four to a 'cluster' 4x3=12).
You will probably find that one or more of the printed circuit lines has corroded or gone high resistance, just check each one with a magnifying glass. If the Leds light with some applied heat I would just run a new piece of wire to the failing rows.
Probably quicker and cheaper to give some more money to theChinks


It's more like 2.5V for red. Other colours including white more like 3V.
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reed
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PostPosted: 16:52 - 25 Nov 2013    Post subject: Reply with quote

Vincent wrote:
Are there any unused female bullet connectors nearby that were originally used for the indys?


Nope not that I can see it's just a bunch of tail light wires, with the indicator wires from either side running into the, and joining them leading towards the block connector, which would be replaced with the new tail light, leaving me no where to plug in the indicator wires. Neutral
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