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eZ430-Chronos blank screen

hello everyone,

I have purchased a eZ430 Chronos development tool. I wrote again the original firmware using the Elprotronic FET-Pro430 software. While the board is connected and powered through the USB programmer the LCD displays everything as it should do. However when I disconnect it from the programmer and power it up from the 3V battery the LCD goes blank and the board doesn't respond to any button presses.

Why this behavior?

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