Dental Equipment Repair. Water damage.

One of the nice things about learning how to troubleshoot Televisions is many of the troubleshooting skills we learned can apply to repairing a variety of other devices. In this case a Dentist brought in a motorized shaker used to mix amalgam fillings.
While examining the circuit board I noticed a hard water residue, and this revealed the circuit board had been exposed to water,. Even though the water had long since evaporated it can still leave minerals deposits behind, and this can create a conductive path between IC pins and cause electronic circuits to fail. After giving the circuit board a good cleaning and heating a few things up the device worked fine.

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