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It was easy to try reversing pins 1-14. Didn't work, upper row was only filled with blocks. I guess I need new display with proper controller (HD44780).
Whole assembly drew 35mA from 12V supply with display connected (pins 1-14 reversed). Same without display. Display had 130 ohm onboard resistor for backlight and it drew only 13mA when 5V was applied (+15 ohm from PCB, total 145 ohm). So reversing pins 1-14 (unintended) made current go up.
I don't have those two leds or anything else connected to TB1 and TB2 yet. Does this matter?
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