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Post: OMG I am so sorry!!! as always (or nearly) the problem is the user. I had a cold solder joint which made the troble. Now I fixed it and it seenms to be the solution. Thank you to be so great to help me. Only one thing confuses me: You wrote, that I should use a 430R resistor. I used a 200R resistor because I read this in one of the tutorials. " The maximum current you can draw from any of the pins on the MCP23017 is 25mA s[b]o by using the 200R resistor in series with the LED we limit the current to a safe level. [/b]" https://www.abelectronics.co.uk/kb/article/17/io-pi-tutorial-1---the-blinking-led Usualy there are only up to 10 LEDs active. But in some cases and for a short time there might be a full load (all the 32LEDs are active. And sorry again for the confusion.