I've been working with the Nybble kit on college vacations since the most recent holiday break and I've had to resolder the pin connectors for the ultrasonic sensor at least 4 times due to my own lack of carefulness. Recently I put in the batteries for the first time since at least March and I found out the yellow LED (the cat's right eye on the board) won't light up-- I hooked it up to a Voltmeter and no electricity is going through it. I don't remember if it ever lit up in the first place, but is there the possibility that soldering the pin connectors for the ultrasonic sensor or the connectors for the Raspberry Pi screwed up the part of the circuit that gets voltage to the left LED? If so, is there anyway to fix it or do I need a replacement board? Could anything else be affected or just the LED which is seemingly there for aesthetic? This has been my first major electronics kit so I don't even know if these questions can even be answered without further inspection of the board.
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I see the problem. There should be a jumper at SW3 connecting BATT and V_S. You can simply solder the two pins together.
What battery are you using? Regular AA battery WON'T work. You need to use 14500 3.7V Li-ion batteries.
Could you take a video to show all your observations, and include the details around the battery plug, and where you soldered the pins?
The yellow LED indicates whether the battery is powering the board and the servos, so it will make a big difference if that branch of circuit is broken.