So, built a 2nd 64 x 64 matrix using 16 x 16 panels. I am finding this odd difference in color/ brightness which is unwanted.
These entire thing is powered by a pair of 5 V, 10 amp power supplied split right down the middle (left and right). I am running this on relatively low brightness so the voltage remains at or above 4.3 V even in the most power intensive patterns.
The power feed from each supply splits to power the upper and lower 4 panels on each side. So the power feed does not match the pattern.
The panels were from a stack that accumulated over time in the garage. At least 2 or 3 vendors on ebay or amazon so there could be differences in the chips/ board.
Is the brightness/ color variation a vendor issue ?
Can anyone suggest a cure that does not involve me ordering new / sorting out the panels and rewiring.