Imagine the 16 pin header of LCD display - a backlight LED is at the one end (pins 15,16) and pwr+gnd on the opposite (pins 1, 2) . Maybe you exchanged them ?
Imagine the 16 pin header of LCD display - a backlight LED is at the one end (pins 15,16) and pwr+gnd on the opposite (pins 1, 2) . Maybe you exchanged them ?