Hard to tell - but, it looks like one of the pins on the LCD isn't soldered? And on the back side of the pcb where the LCD header goes into the board it looks like you have some balling - which may mean a cold joint ( I think that is the term). It might be worthwhile to heat up the soldering iron and re-melt the solder to see if you get better movement into the joint. I noticed that the pin I could see on the pot didn't look like the solder had gone through the joint? How does the connection on it look - I don't imagine it would make a difference though and you've said you are getting display. Is it only an issue when the pump / relay turns on and off? or all the time?