It may be that the digital tube is burned out.

Generally, if the digital tube light of the mixer does not light up, it is because the digital tube is burned out, but it is also possible that the circuit surrounding the digital tube is broken.

The Yamaha (Yamaha, Yamaha) brand was founded in Maebashi, Japan in 1887. Yamaha products range from keyboard instruments such as pianos, electronic keyboards, and synthesizers, wind instruments such as brass and woodwinds, string instruments such as violins and cellos, and all percussion instruments, to the most advanced professional audio equipment. At the same time, Yamaha is also a comprehensive international group that operates music popularization business, network products, sporting goods, kitchen and bathroom supplies, engines, placement machines and other products. Yamaha Corporation (English: Yamaha Corporation) is a Japanese company that produces musical instruments, audio equipment and sound effects products. It is currently the largest musical instrument manufacturer in the world. Headquartered in Japan, its subsidiaries also operate household equipment and motorcycle-based businesses. In 2004, he developed VOCALOID, the core engine of speech synthesis software for electronic music production.