I am too stupid to get an i2c display to work.



No attachments, yet. Could you post photos of how the display is connected to the Uno? It would be nice if we could see the solder joints between the I2C backpack and the LCD, both sides and the solder joints on the I2C expander chip on the backpack. Does the backpack have the required pullups from SDA and SCl to 5V?

I just saw your other post and have questions.

Does the I2C scanner find anything (maybe related to the sensor shield)? If you remove the sensor shield and connect the display, does the scanner find the display?

Please read THIS and avoid cross posting as it just wastes peoples time and effort to help you.