I got wrong pixels?

[angus40]

On the 100 count string tap into the data line for pixel #2 and connect it to a port , pixel #1 on that string could be sick .

Also you may require a resistor inline with your new pixels . look closely at the pictures you posted .

[pmiller]

On the 100 count string tap into the data line for pixel #2 and connect it to a port , pixel #1 on that string could be sick .

Also you may require a resistor inline with your new pixels . look closely at the pictures you posted .

What are the odds? I forgot I cut off the first pixel of the string that worked. What are the odds of all 5 strings having a bad first pixel? Apparently in my case 100%. That was the problem. I cut off the first pixel and the second string worked. Did the same on the third string and it worked. Guess I should just cutoff the first pixel of the remaining 2 strings. Thank you Angus40.

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[ags0000]

I agree - what are the odds?... and I think the answer is this is not likely pure coincidence.

It could be that the pixel strands were made in the same lot, AND they are made in a jig where all pixels at position <n> are inserted and connected, then position <n-1>, etc AND it was just at that point where the first pixels in your strands were being added that they ran out of pixels and went to a new batch of pixels AND those were all bad... Note that I'm not saying that's how these are made, but pointing out there are some other explanations.

However, I'm pretty sure that Ray Wu tests the strands before sending them out, and what may be the most likely explanation is that the strands were hooked up incorrectly (and the first pixel was damaged) or even perhaps an ESD event ruined the first pixels (though I believe they are still using a 33Ω resistor in series with the data input...).

Just a thought, not accusing or suggesting I have the one and only answer. It would be interesting to get to the definitive cause though.

[MartinMueller2003]

What are the odds? I forgot I cut off the first pixel of the string that worked. What are the odds of all 5 strings having a bad first pixel? Apparently in my case 100%. That was the problem. I cut off the first pixel and the second string worked. Did the same on the third string and it worked. Guess I should just cutoff the first pixel of the remaining 2 strings. Thank you Angus40.

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Sometimes Pixel 1 is wired differently than the rest of the pixels. I had that on a few of my strings.

[pmiller]

Thanks guys. I just find it strange that the string would work when connected to another string but not when connected to the controller. But, problem solved thank to you all.

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[Barnabybear]

Hi, I'm guessing the photo in post one is the first pixel that you cut off the string that worked. I notice it has a 151 (150 ohms) resistor in the R1 spot on the board? Do the other pixels also have this resistor? This looks like it it could be a series input resistor fitted just on the first pixel of each string and something like 330 (33 ohms) fitted on the others.

If so as the E68x already has a series output resistor of about 220 ohms adding the 150 ohms input to it would be quite a high value and explain why the string didn't work. How ever if connected to another pixel which doesn't have an output resistor othough higher than the 33 ohms 150 could be low enough to work.

[pmiller]

Hi, I'm guessing the photo in post one is the first pixel that you cut off the string that worked. I notice it has a 151 (150 ohms) resistor in the R1 spot on the board? Do the other pixels also have this resistor? This looks like it it could be a series input resistor fitted just on the first pixel of each string and something like 330 (33 ohms) fitted on the others.

If so as the E68x already has a series output resistor of about 220 ohms adding the 150 ohms input to it would be quite a high value and explain why the string didn't work. How ever if connected to another pixel which doesn't have an output resistor othough higher than the 33 ohms 150 could be low enough to work.

All 500 pixels have that 151 resistor.

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