1. See if the menu button on the display has been pressed and does not pop up. If there is, just press it a few times to make it pop up.

2. Is there water in the button part, causing a short circuit? If there is, dry it with a hot air blower.

3. Whether the use environment is wet, resulting in short circuit of keys. If there is, dry it with a hot air blower.

4. There is something wrong with the circuit board where the menu key of the indicator lamp is located, which needs to be repaired.