Time circuit control microchip

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"Unbelievable, that this little piece of junk could be such a big problem."

—Doc Brown

The time circuit control microchip was essential to the working order of the DeLorean time machine. It was manufactured in Japan. After it was hit by lightning during the Hill Valley Thunderstorm in 1955, sending Emmett Brown back to 1885, it shorted out along with the flying circuits, burning to a charred color.

Doc's younger self and Marty McFly found the DeLorean buried in the Delgado Mine and recovered the burned-out microchip. New parts available in 1955 were used to replace the microchip allowing the time machine to work again, at least to reach temporal displacement, however it would never fly again.