<div dir="ltr"><br><br><div class="gmail_quote">On Sat, Oct 18, 2008 at 1:29 PM, Ian Daniher <span dir="ltr"><<a href="mailto:it.daniher@gmail.com">it.daniher@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div dir="ltr"><font size="2">Hello All,<br>I'm working on a personal project(aquarium / grow light) involving the LED backlights of XOs.<br>If any repair center has a few extra from broken screens and don't plan on using them, I'd be willing to pay shipping for these parts.</font><br>
<b><font size="4">If you want to use them in your own project, here's what I've found:</font></b><br><ul><li>Twelve LEDs arranged as follows </li></ul><div style="margin-left: 40px;">LA1... LA4 LB1...LB4 LC1....LC4</div>
<ul><li>The connector has a single high(14v) line and three grounds. Each ground will drive multiple LEDs evenly spaced throughout. This may correlate with the above markings, but the LEDs are so bright as to make it difficult to tell. </li>
<li>Tying together the three grounds successfully allows me to drive all LEDs on the bar simultaneously. </li><li>I can drive the one positive terminal with 12v from a wallwart. I've used a computer PSU with great degrees of success. </li>
<li>The brightness of the LEDs may be controlled via PWM but is definitely controlled by grounding different combinations of the three ground terminals. </li><li>Reversing the voltage on the LED bar will cause between a sixth and a third of the LEDs on that bar to fail, indicating that, as expected, while all LEDs have very similar, they do not have the same electrical characteristics.</li>
</ul></div></blockquote><div><br>This last bit suggest to me that the LED's are wired in a certain way, not that they have different properties. I'm confused. Do the lights shut off on each bar that you have tested? Or just on a specific bar?<br>
<br>--Seth<br><br></div></div><br></div>