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Make sure the OE pin is pulled low to enable the output. If OE is high, the output will be in a high-impedance state, causing no channel switching. Inspect Wiring and Connections: Double-check all connections to ensure there are no loose wires or faulty soldering. Pay particular attention to the control, Vcc, and GND connections. Test the Timing : Use an oscilloscope to check if the control signals are being applied at appropriate intervals. Slow down the switching if necessary by adding small delays between control signal changes. Test the Device in Isolation: If problems persist, try testing the 74HC4051D with a simple configuration (only one input and output) to isolate the issue and rule out complex circuit interactions.By following this step-by-step guide and addressing the potential causes, you should be able to resolve any issues related to the 74HC4051D not switching between channels. If the problem persists after troubleshooting these common causes, it may be worth considering the possibility of a defective part.