[fixed] issue adjusting screen contrast

Hi guys, I’m on the verge of completing the assembly but I have issues with the lcd (yeah I know same old problem…)

I’ve been twisting the trimmer for turns and turns (for more than the 24 indicated without clicks) but I saw little improvement : at first I just had a blue screen… then white squares came in, now I can painfully distinguish parameters adjustements as I turn knobs…

Any clues ?

Oh and by the way soundwise, it’s GREAT :slight_smile:

What is the voltage on the trimmer middle pin?

0V

Try resoldering the Pad thats connected to GND - its easy to have a cold Joint here as the Groundplane sucks up most of the heat…

Should be between 0.5V and 1V for good contrast…

well after a closer look, I realized two pins were left without solder…

PROBLEM SOLVED.

Thank you guys !

Next step, finishing the programmer ! :slight_smile: