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LED Board Control Answered

Hi there.  I salvaged 2 boards of LEDs from an old LED can at work.  They were previously DMX, and have an array of red, green, and blue LEDs.  There are four leads coming from the board, +, -, a dashed line, and an unmarked line.  I am looking to integrate these with another project, but am unsure how to go about finding how to control them electrically.  I was thinking it might be digitally controlled right on the board, but I see no IC.  

All I am looking to do is figure out where voltage needs to be applied in order to have different RGB levels.  If I helps, the number printed on the board is FT140PCB GS.  I am able to attach an image if that would be helpful.

Any ideas of how to go about this?  Thanks a lot, anything would help!

Discussions

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thegeeke

8 years ago

An image would be helpful... DMX is a tricky protocol... my guess is that there is some processing on the board, the + and - are power (I can guarantee that!), and the other two wires are probably serial send and receive. (Again, that's my guess... without seeing it and experimenting with it, I can't say for sure.) Also, was the fixture static or intelligent? That could have more to do with it than most people think. Do you have the model number from the fixture? Or at least the brand? Most of my training is in intelligent lighting (even though I do IT and sound for a living... go figure!), so I've taken apart a lot of different intels. Some of them actually send data through the LED board to the rest of the light. Granted, not the most efficient way to run a light, but it's mostly used in some of the cheaper brands such as Chauvet.

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chamberlain2007thegeeke

Reply 8 years ago

Hi there, thanks for the reply. It was a static light which took DMX in. It was not a name brand, it was apparently from a Chinese manufacturer. I've attached a couple photos. Thanks a lot!

IMG_20110926_142456.jpgIMG_20110926_142646.jpg
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thegeekechamberlain2007

Reply 8 years ago

Hmmm... I do see some processing... could you send me a picture of the underside of that board? It looks from this angle as if it is sending the DMX signal through the board... it also looks like a knock off of a Chauvet LED.

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chamberlain2007thegeeke

Reply 8 years ago

You're probably right. I have seen a similar Chauvet in use. Here is a picture of the underside like you asked.

IMG_20110927_110740.jpg
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thegeekechamberlain2007

Reply 8 years ago

Yep, the DMX is going through the board... I would say that you need DMX signal to control that. (Unless you wanted to do some VERY advanced circuitry...) ;)