LCD Backlight Works But No Display? Try This

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If your Arduino LCD isn't working, the problem might not be your code —
it might be the LCD type itself. In this iagnostic video, I test
a standard 16x2 LCD against a working I2C LCD side by side, using a
multimeter and a logic probe to find the exact fault.

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Схемы по заработку в интернете
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