You have connected A, K to 5V, 0V. So I would expect the Blue backlight to shine.
I would be happier with a small resistor e.g. 47R. You can see that R8 is 100R from your photo.
Obviously you need to connect RS, EN, RD, D4, D5, D6, D7 for it to display any text.
If you own a DMM, you could check whether A, K are reversed.
The displays may be cheap for a reason. OTOH, there would be a lot of bad feedback.
David.