Replace the sockets if you don't measure continuity through the sockets with new bulbs installed. With new light bulbs installed and the range hood unplugged, check for continuity through the light sockets with new light bulbs installed. Replace the switch if you don't measure continuity through the switch when it's turned on. If your range hood uses a switch to control the lights, unplug the range hood and test the switch for continuity using a multimeter to see if the switch allows current to flow to the lights when you turn the switch on. If the lights still don't work after replacing the control board, you'll likely need to replace the user interface control. If the electronic control board doesn't activate the lights, you'll likely need to replace the electronic control board. DIY testing of the user interface control isn't available for most range hood models. A user interface control is a keypad and display panel that sends signals to the electronic control board through a ribbon wire cable when you press its selection buttons. Replace the light bulb socket if its damaged or defective. If the new bulb wont turn on, the socket could be defective. If a light wont turn on when activated, first try replacing the bulb. If your range hood uses a user interface control to control the lights, you may need to replace the user interface if it isn't sending signals to the electronic control board when you press user interface buttons. The light bulb socket holds the light bulb in place and connects the electrical leads on the bulb to the power supply wiring. Replace the control board if you see burn marks because the burn marks indicate a control board failure. If the wiring is okay, check the electronic control board for burn marks. Reconnect any loose wires and repair any broken wires. FOR SALE Besides the 763N or HB80RL, the S97014212 also fits. With an average lifetime of 30,000-hours, it is ideal for use in Desk Lamps, Chandeliers and Wall. BROAN NUTONE S97014212 763N HB80RL 678 679 Light Bulb Socket Reflector FAST SHIP - 17.95. It is an energy efficient replacement for a 40-Watt traditional incandescent household light bulb. Unplug the range hood and check the wire harness connections between the light sockets and the control board or light switch. Using only 4-Watt, this G9 bi-Pin base LED light bulb provides a cozy warm white light (3000K) and high luminous efficiency with 400 Lumens output. A failed electronic control board, bad user interface control, broken light switch, bad light bulb sockets or a wiring failure can prevent the lights from working.
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