Arduino UNO R3 with LCD 16x2 by I2c. PROBLEM

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Do you solve it? I have the same problem :(. On the back shows the red light... "voltage" but not green screen and just black cubes on the front line :( ?!?!?!?!?!?!

davidtakacs
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I think the problem is in library, have you try it withiut i2c backpack?

jasum