Mine did as you say. I unplugged power and then held B button in. Plugged in power….LCD was off. I need to check into boot loading mode.
The voltages are correct, that’s good. The first thing to figure out is if the microcontroller is up running. For example, unplug power, then press and hold the second pushbutton (B2) and plug the power back in, does the LCD remain off? If it remains off, that means the microcontroller is running and can successfully enter bootloading mode. If not, that means for some reason the microcontroller is not up running. Can you take off the LCD and take a picture of the microcontroller? Also, make sure the 12MHz crystal (for microcontroller) and 25MHz crystal (for Ethernet controller) are not accidentally switched.
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