Cannot make 48x48 led matrix working correctly

[wash34000]

Hello,

I get some old matrix led 48x48 with MBI5124 chip on it.

I can't get it to work properly. I could see that it was made up of two 24x48 matrix with a connector for each part. I tested the demo and I only have a 16x24 area that displays on the right, the left area of 16x24 has a line of 4 and the bottom area of 8x48 does not display anything.

The weirdest thing is the connector part, it's not a standard 16-pin port but a 20-pin port. and on this connection I have R3 G3 B3 that I don't know how to use.

I also only have AB, so I tried with the setting "--led-row-addr-type=1" but the result is worse than with 0.

The best rendering was obtained with this: "sudo ./demo -D 1 runtext.ppm --led-rows=16 --led-cols=48 --led-row-addr-type=0 --led-multiplexing =13"

Pinout: 1 - R1 2 - G1 3 - B1 4 - GND 5 - R2 6 - G2 7 - B2 8 - GND 9 - R3 10 - G3 11 - B3 12 - GND 13 - A 14 - B 15 - NC 16 - NC 17 - CLK 18 - LATCH 19 - OE 20 - GND

Thanks in advance

[wash34000]

I've try to switch pin from R2 / G2 / B2 to R3 / G3 / B3 and with this wiring i have the bottom area on the rightr working but no more the center. So now i'm sure that i need to connect all 3 datas to make it working ...