| Mar 14, 2016 - 6:06 AM | Forum: Interior/Audio/Electrical/Wiring · Post Preview: #1079724 · Replies: 8 · Views: 20,899 |
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Enthusiast Joined Mar 14, '16 From USA Currently Offline 
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QUOTE (Unicorn @ Sep 20, 2011 - 4:23 AM)  QUOTE (match220 @ Sep 20, 2011 - 4:58 AM) I just replaced a friends laptop LCD screen and it has an LED backlight instead of the neon tube type backlight. I decided to disassemble the screen to pull out the LEDs to see what size they are and if I could probably use them in something else. They are the flat bright kind, and I'm thinking about rearranging them into a square pattern and putting them behind my dome light. I can't seem to find the voltage online, and I don't want to risk blowing them by guessing. I thought about wiring them into a radioshack universal power adapter that I cut the tip of a long time ago, that way I can slowly increase the voltage until they come on. But I still won't know the exact voltage they were made for. Does anyone know what voltage they are supposed to be? Or at least approximately. Without sounding like too much of a nerd (  ) there's very little that I can't tell you about an LED or it's driver circuitry, but I'd need to see a pic of one of them first of all, so that I can determine the exact type of emitter that you're dealing with. If you want me to be general about it, you should be able to direct drive a SMT LED up to roughly 3.5-4v without doing damage, but a safe voltage would be 3v. If you are dealing with high intensity or high output LEDs, it's different - but since these came from a laptop LCD backlight I assume they are just standard SMDs, but I'd still like to see a pic of them so that I can tell you exactly what you're working with  Source(s); I'm an Electronic Engineer, but more importantly I design, build and collect/use high performance flashlights, most of which are LED based. Hey Unicorn! A nerd is exactly what I need right now. I have some backlight leds from a 42" LG TV There are a total of 40 leds. (4 rows of 10. The rows of 10 leds all plug in to a board at the top. I didn't save the main circuit board from the TV and now I'm assuming I should have because of the power supply for the backlight. My question is, can I just get some sort of power supply and get all the leds to light up? I'm just wanting to make a really bright art project out of them. |
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