TLC5958 Need help for cascading

I'm developing a display for a client and I'm using the TLC5958 driver. The display has 16 columns and 7 lines. The schematic of the PCB I developed is very similar to the one on tidu370.pdf with the exception that I have one driver per PCB (each PCB has 16x7 RGB leds).

For prototyping, I am using SCLK and GCLK with low frequencies and now I can already play my images and switch them on one PCB. However, when I try to put two PCBs in cascade, ie cascade 2 TLC5958 drivers, it doesn't work. In fact, I really don't understand how can I put this thing working... I think there is something I am not understanding well: the pins LAT, SCLK and GCLK are common to the several TLC5958 drivers and the SIN of the second TLC comes from the SOUT of the first TLC, all as is in tidu370.pdf, with the difference that signals are buffered between PCBs.

What happens to me is that the signal I put in the SIN of the first TLC is replicated (exactly the same) for the second TLC with a delay of a few microseconds. The LAT, SCLK and GCLK are common. I do not understand how this schematic will work with cascade. Need help!