Hi,
I have developped my board based on TLC5940 as you can in the joined picture.
I have cascaded 15 of this IC. having finishe the development I order the board and start doing some Test. It happen out of the 10 board that I order only 4 are working as expected.
Making test on defect board, it happens that the sixth driver received signal at the input, but does not transfer it at its output. it means the transfer signal between sheet Tr1 and tr2 are not occuring.