Both the display and the backlight are not showing anything at all when I power the Arduino through the FTDI with 3.3V due to low voltage.The 3.3V from the FTDI drop to 2.3V. That's not enough to power the display.
The Vcc on the Arduino is at 3.3V but its not connected.
And by the way, the backlight is the reason for the voltage drop from 5 to 4.6V.This is not happening when the backlight is off.
Take a look at the HD47780 datasheet. It is specced to work at 2.5v or higher.
I don't really need the LCD to work at 3.3V, it just would have been handy so I don't have to switch the power supply after programming.
The Ampermeter part of my Multimeter is broken so I can't measure the current at the moment.I did not bridge J7, the resistance between the J7 leads is 12 ohms.
I'll try powering the arduino from 3.3V FTDI and the display from 5V, will post the result in a bit.Isn't that a short to frame though?