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LED change problem

Saulens

New Member
Hey,

Maybe someone can help. I want to change LED diodes for my BMW from red original to orange color ones.

When i remove original led all circuit wont work. After i solder new standart 5mm led it also wont work, but if i solder onto original diode contacts new orange led contacts it works. So maybe ideas what type LEDs to use or what to do?
 

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Allicstocks

New Member
Hi Saulens,

Dont work because this are automotive special diodes(Not Standard),the better way is try to find original Diodes datasheet,hope this be helpfull for you.

Best Regards!
 

ClydeCrashKop

Well-Known Member
Most Helpful Member
Did you have the + / - polarity right on the orange LED?
 

rjenkinsgb

Well-Known Member
Most Helpful Member
I'd guess you need high power / high current rated LEDs rather than generic ones.
There are thousands of types with a vast range of ratings.

Even with appropriate current rated ones, orange will generally have a slightly higher operating voltage than red, so when they are all changed it may not work; the only way to know is try them, one at a time.
eg. Some typical voltage ranges for different colour LEDs that all have similar low current ratings:



The PCB looks to have fairly sophisticated control and monitoring circuitry so it may well be that any mismatch in the LED characteristics is seen as a fault and it shuts down.

ps.
Are you aware of your local regulations re. light colours? In some countries it is illegal to change from the manufacturers original colours, or at least you need to notify your insurance that you have a "modified vehicle"..
 

Saulens

New Member
It's US spec lights i need to change it to orange (EU regulations) it's pretty expensive to buy new ones so i have chance to experiment first. So basically try different type of LEDs.
 

rjenkinsgb

Well-Known Member
Most Helpful Member
OK on the colours.

Can you measure what current an unmodified LED lamp assembly draws from the 12V supply?
If there are no inductors on the board (I could not see any in the photos) the current regulator is likely linear and the input current the same as the LED current.

That would be a good starting point to help find which LEDs could be suitable for the conversion.
 
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