Did the chip come off your yellow cart, or is something on/around the chip area of this cart sticking out- which would catch on the thin metal wires of the chip sensors? The wires of these chip sensors are very thin, and can be easily damaged by installing a cartridge without a chip attached, or if there's something on the chip area that catches on the chip sensor. You can get replacement sensors from www.compassmicro.com, and I have included photos below showing the two plastic tabs holding each sensor in place.
Make sure to install the sensor with the correct side facing out (shown above). The back side (with shorter wires) is shown in the photo below (the back side touches the green computer board behind the sensor).
I hope this helps, keep me posted.