This old Omron vibrating toothbrush has interesting construction, compared to e.g. Philips Sonicare. It's basically a vibration motor with the off-center weight on a stick, closer to the brush head, with a two-cell NiMH(!) battery, with wireless charging. Note how well the PCB is labeled, and how many test points there are. Also, there's a set of connections for a (testing?) "tool", including TXD and RXD! This brush only starts for a short moment, despite the battery being full. Dead VREF?
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All blank pads on the bottom have the little dimples from the pogo pins of the test/programming fixture. Note how there are separate pads for providing the test battery power to the PCB under test. No test pads for the charging coil, though.
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