OpenSprinkler › Forums › Hardware Questions › DIY Kit Assembly Questions › New build, LCD does not light up › Re: Re: New build, LCD does not light up
Hi, Ray. Thanks very much for your guidance. With your course in meter reading, we were able to determine that the voltage looks good. With the USB as a power source, VIN-GND is close to 5V and VCC-GND is close to 3.3V.
However, it appears that the resistance is way too low. For both VIN-GND and VCC-GND, the resistance is under 1K ohms. I’ve studied the back of the board closely with an eye loop and I can’t find a solder bridge. The only thing I can see is some filaments from solder wick (I believe). I’ve attached a couple of pictures – one each of the front and back of the board. Perhaps you can zoom in and see something I can’t.
Thanks again for your help! We’re building this as a family project so it’s a good learning experience.