No HDMI Signal - is my board dead?

Do you have any other SoC board with 3.3 v serial port (e.g. Raspberry Pi, …) that you could use instead of a USB to 3.3V TTL Serial UART cable to access the serial port on the VF2 ?

Even some Arduino boards could be configured as an Arduino Serial Bypass, which is effectively ignoring the Arduino chip altogether and using the on-board serial chip to function as a dumb USB to Serial Converter ( e.g. ). But you would need to verify that the voltage was 3.3 volts for your particular make and model of Arduino to avoid any risk of permanently damaging the VF2.