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I was bored and decided to rip a HDTV all the way down to the leds. Inside I found 3 strips of LEDS all wired up in series I think. I tried a 12v source to power them up and no go. Anyone have a clue what the voltage would be to fire them babies up? Main/ Power board will be going on eBay shortly, but sadly not marked output!! It cant be a/c as the wires way thin, they would smoke in a heartbeat with a/c current.
probably less then a volt with the way current leds are, is there a transformer near where the leds plug into? If so and it has a model number, that should tell you the working voltage of the strips. In my experience, most leds will burn out at 3v and will turn orange or red first before popping. I've been fortunate enough to find some that will hold 9v.
There are youtube videos about how to make a lcd lamp tester. I purchased one for laptops because I wanted one that is packaged in a neat plastic box.
If you go on youtube you will find lots of videos on testing and repairing lcd/led tv's. Have fun on the junk ones you get for free, a couple of new capacitors you can have a good tv.
Mike
Hell, just keep cranking the voltage up and see what happens.
That's funny that you just posted this. I stripped down a 75 inch Samsung and got 10 strips out of it. I want to use them as under cabinet lighting and so I was trying to figure out what the voltage was. I used a 12 volt wall wart power supply, but that didn't even make it blink. I looked up on the internet and found out it takes quite a bit of voltage. one fella had a variable power supply and found out it took about 48 volts to drive them. I assume that the power board varies the voltage to change the intensity. I'm going to try a laptop power supply with 48 volts.
I do know if you add resistors you can step the working voltage up to 9-13 volt DC. I use a 470 ohm for 1 to 3 of them.Quote:
Originally Posted by logansryche
Also LED's will only light up one direction, there is a positive side and a negative side.
Yes I tried 12v...guess its higher...hmmm
I have just found a TV with those led strips. They are from 'LED backlit TVs'.
Same deal, I don:'t know the voltage yet.
Each individual led is probably under 5 volts, its just how they connect them up, inline or such.
I have been making tiny torches from 3volt motherboard battery clips and a led. Also 9v battery and battery clip offa a old 9v battery and LEDs.
Down to a AAAA battery (yes they do make them!!!) Out of a alkaline 9v battery, there's 6 of them and a solar lights 1.5v white LED.
For lighting needs they do make 10mm. LED's and they will run off of 12volt if you want to "customize your truck/car" by changing out the interior lights. Also a couple put together could make neat outside running lights for safety.
I sell colored ones that will slide right in and replace the standard meter light in a mobile CB radio. These run on 9-13 volt and runs a lot cooler than the lil standard bulb and will last 10 times longer. Here is one example of a popular one.
http://i1135.photobucket.com/albums/...psw3om3iu7.jpg
This is a multicolor that rotates thru 7 colors.
http://i1135.photobucket.com/albums/...pslh0w006t.png
15 volts I bet most these lcd are running rails like pc right so 3.3, 5, 12, volts pos and neg maybe its using 5 volt rail and using a dc to dc to upconvert to 15 volts sounds stupid right why u would lose current to converting but these places just pump out what they want. If they have a ton of extra older components sitting there they will change the design to use them and not tell anyone lol. Its what we get for buying the cheapest stuff from the places farthest away from our home. I am in no way anti anything. Unless that anything is anti american. Then Im anti that anything.
Lord lift up THE USA
Aaron.
there is a "hot" side and cold side. the manuals can be found online, and the 120v ac usually goes to 80vdc for those, but i'd have to check to be sure. all the ones I fixed were usually blown diodes, and/or fuses. they are very sensitive to power spikes, and easy to fix if you can find a replacement board on ebay for around $35...got several nice freeby tv's that way.