Why shift registers 74HC595 but not MAX7219 or similar MAX7221?
https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf
1 driver MAX7219 with 1 resistor may control 64 LEDs.
I checked connections, it seems ok.
Also, I found out that the same problem faced earlier someone else: Can't get second 74HC595 shift register working! . But it seems he couldnt solve.
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