Aether2 #1 -- no problems
Aether2 #2 -- still not working, it is white all of the time when power is applied. the program/operate switch has no affect nor does the dmx terminate switch. the switches have no affect whether they are flipped during operation, or before power is applied. being connected to an active dmx dongle, or not, has no impact. attempts to program and get the red flash -- no affect. it remains white.
my problem sounds similar (identical?) to kgustafson's unit #2.
Troubleshooting steps...
- swapped the PIC with the working unit, no impact and the PIC moved to the working unit continues to work
- swapped the 485 chip with the working unit, no impact, ...
- touched up solder points, inspected front and back, no impact
- tested continuity to all test points. all good...
- tested resistance across all of the legs of the LM2941s, and each of the 4 behave like the other 3
- i can read and write to the PIC without problem through the icsp interface
- reprogrammed PIC to use the original image multiple times throughout my testing, no impact
- reprogrammed PIC to use a copy of the working unit #1's PIC with it's channel set to 321, no impact
- desoldered and resoldered the wires to the LED in order to access back of the PCB... twice... and no impact
can a bad part cause this behavior? (...it would be a part that is not the 485 or the PIC -- since i've swapped working parts for each of them)
At one point I thought I had a bad LED with a missing chip. i was wrong. the picture i took to upload to the forum looked like the chip was missing, but tissue was obscuring the chip. while I have a new LED in my possession, I have NOT swapped it out.