[davidplotz]

THanks.

 Last question before I surrender. I swapped the IC in the dim quadrant (100 quad)  and got this weird result: The whole board became non-responsive. Half the LEDs are lit up, but dully (including in a previously dead quadrant!). None of the LEDs now respond to movement. They just sit there. 

One point that may be germane. The first time I swapped the IC I put it in backwards and turned the board on. Then I realized I had put it in backward, and switched it. COuld that have messed up the board in that way? Is there some other obvious fix. Thanks, and this will be my last bothersome note. 

I appreciate your thoughts! 

D

[davidplotz]

Thanks Windell. I hugely appreciate the intervention. I will go deeper into this over the weekend, but a few quick answers

I replaced the one LED and still have the same situation with the dead ones, but I will reexamine it more closely on the weekend. 

I don’t have a multimeter.

I double and triple checked the resistors in the dim quadrant, and they all look good, unfortunately. Any other tips on that? 

[davidplotz]

Hi Windell

Thanks

RE: The first step is to check the 5 LEDs that are not lighting up to see what the issue is.  Check to see, for example, if any of the LEDs is backwards by looking for the flat sides of the collars.  Check to see if any of those LEDs is not properly soldered.  If that all looks fine, then one of the LEDs may have been damaged.  Use a fresh LED, and place its two pins across the pins of each of those 5 LED locations, to see if it will light up a little bit.  

I tested the five dead LEDS in the dead quadrant, and four of them lit up an LED that I held across the pins. But I was not able to get the fifth to light up at all. (The fifth also looks like it is the last one in the series). 

I then swapped out that fifth dead LED with a new one, and it is still dead (as are the other four.) Suggestions?

[davidplotz]

I’ve now completed all four boards. I also have a quadrant that is very dim. The lights all work, but they are not bright like the other LEDs. Any thoughts on that? 

Again, thanks from a novice. 

[davidplotz]

Addendum to my previous note. None of the LEDs respond to movement in the light or the dark, but most of the LEDs in the dead quadrant do have a dim glow. 5 of the LEDs in the quadrant (in a W shape) do not have any glow. Thanks, and I appreciate the help. 

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