Just finished building the PreenFM2 and it fired up 1st time. I used an LCD instead of OLED. The LCD is lit, but blank. I went back and checked all connections and then also put a 10k trimmer in for RV1 since I have the LCD(thought that could be the problem). I checked the jumpers, I have jumpers on 1 and 2 but not 3. I am using a compatible HD44780 LCD. I am using USB power only. The unit is making sounds and I can change them but I am doing so blind. Any thoughts what else I can try?
