My son recently finished soldering his timesquare watch together. I wasn't observing him the whole time, but he has made other soldering kits successfully before.
The watch appears to be working, telling time, etc, but the very top row of pixels doesn't work, and third from the top row doesn't work, but sometimes comes on for a bit. I inspected the solder joints visible from the bottom, and they seem ok.
Any hints on what to look for to help solve this problem?