The light is probably broken. To solve this problem you will need to open the device and solder in a new one, or replace the LCD’s board entirely. See the Insignia NS-B4111 Troubleshooting page for more information.
We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.
Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!