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Conlonl

Posted: Wed Sep 16, 2015 1:44 pm

Joined: Sep 06, 2015
Posts: 7
Trade Rating: 0

Hello Got a set of those aftermarket rear led taillights however I have a problem where a couple of the individually wired LED bulbs have gone out, it not as easy as just replacing a bulb I think it could be a faulty connection, anyone else on here had a similar issue or know anything about electronics who can help? Thanks Luke

mtempsch

Posted: Wed Sep 16, 2015 3:50 pm

Joined: Apr 14, 2010
Posts: 713
Trade Rating: +2
Location: Gothenburg, Sweden

Conlonl wrote:

Hello
Got a set of those aftermarket rear led taillights however I have a problem where a couple of the individually wired LED bulbs have gone out, it not as easy as just replacing a bulb I think it could be a faulty connection, anyone else on here had a similar issue or know anything about electronics who can help?
Thanks
Luke

From what little I remember from back when I mounted mine, similar to these, there was an electronics module with all the components 'potted' ie encased in a plastic compound meant to prevent damage from vibration and moisture (as well as making repairs or other tinkering a right royal pain...)

I don't recall how the LED's were wired, but if they're as you say individually wired from the module, then it's a question of desoldering the LED's in question from the wires or PCB traces they're connected to, and solder in a new one (observing the correct polarity) if it's the actual LED that's failed. If the fault is elsewhere it gets 'fun'. The potting compound can be dug out mechanically (carefully) and/or dissolved with the appropriate chemical. What type varies depending on compound used, and might also be not too good the encase electronics...

Depending on how the electronics were implemented, there could also be a fault in a series resistor (most likely in/under the potting compound...) or maybe other electronics (ditto).

Of course, things might have changed over the years (LED's are more common today and ways to drive them has evolved) / differ between makers. But if they're anything like I remember mine to be (haven't had cause too look into them in a looong while, even my rear and indicator bulbs have been very long-lifed) I doubt you'll be able to do much anything without first splitting/disassembling the lights.

How are the dead LED's placed relative each other, and how many are dead? If near each other they might be a 'series group' in a set of paralleled groups, and the fault may be just one of them or in a connection between those LED's...

First thing I'd do is try to get a voltmeter onto the dead LED's and see if there's any voltage across any of them (and if it changes as the brake is applied. If I thought they might be a series group, I might try to very briefly ('in passing' short each LED in turn and see if the other dead ones might light up. (Very briefly because the voltage current applied to the other LED's would be more than they're designed for, but for very short instances they normally can take it.

Or poke each LED individually with a battery with a resistor in series, 3V 680 Ohm should be safe voltage/current-wise, and give a noticeable though not bright light, But observe polarity as they typically don't like much reverse voltage, but 3V should normally be OK, but better safe....
If they light up from that, then fault isn't in the LED - driver circuitry or connections...

Good basic read on LED's

Edit: fixed the resistor value, should be 680 Ohm, not 680k Ohm...


	Silvermetallic 2004 206 RC

Conlonl

Posted: Wed Sep 16, 2015 5:17 pm

Joined: Sep 06, 2015
Posts: 7
Trade Rating: 0

Thanks mtemsch not an electronic expert but when I tried them the there was a row in between working rows that did not work but did pop on Dr a second when the pedal (brake pedal) was pushed but then went off again, also 3 more lights in a corner that appear to be together work when the light cables were wiggled but didn't stay on once let go of this sounds to me like potential loose / faulty wiring does this sound any easier to fix? Thanks
Luke

mtempsch

Posted: Thu Sep 17, 2015 12:26 am

Joined: Apr 14, 2010
Posts: 713
Trade Rating: +2
Location: Gothenburg, Sweden

Conlonl wrote:

Remote diagnosis is so tricky...

The corner group does sound like a wiring issue. Follow the wires to where they attach to LED or PCB and look closely (magnifying glass recommended ([cell phone] camera w macro function can also be helpful if it can get in there) and touch up anything that looks iffy with a soldering iron and some fresh solder.

Of course, doesn't have to be a solder connection itself that is the cause, could be like a crack in a trace on the PCB that gets wiggled shut as pressure is applied to a wire that attaches nearby...

Try to localize exactly which wire, and end of it that might be the culprit by very selective poking of he wires and concentrate on that end - connection and stuff nearby.

The line that lit up momentarily when brake was applied, to me sounds more like something upstream (in the driver electronics), but could also be because of how they're wired. Photos of the rear of the light might help with clarify some stuff remotely, but without some grasp of electronics I'd say you're probably limited to touch up accessible solder joints if you're OK at soldering - beyond that find someone local with a knowledge of electronics to have a look.


	Silvermetallic 2004 206 RC

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