LCD wont turn on, just beeps loudly

When I push the button to turn on the LCD, the screen flashes on and I get a loud beep as I hold the button in. What am I doing wrong?

I've checked my electrical connections multiple times.

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The LCD cables are not shielded. Sometimes this creates an issue.

You can use ferrites, or try aluminium foil around the flat cable. It might correct the issue (BE CAREFUL to not create any shortcut with the foil !!!!!!)

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