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Problem with just assembled Zumo 32u4

Hi. So I’ve just assembled my sumo 32u4 with 50:1 motors and I have problem with weird 8 squares on LCD. I’ve checked if there is a problem with the code or soldiering but everything seems fine. Can someone help?

Hello.

Have you tried adjusting the contrast potentiometer. Also, what program is your Zumo running; is it one of the examples from our Arduino library?

Some of your soldered joints on the LCD look like they might be problematic, so I recommend you try and improve those joints and test your LCD again. The Adafruit Guide to Excellent Soldering might be a useful reference for that.

- Patrick