I bought a second-hand Maschine MIKRO MK3, all function is good, But LCD screen is not working, it does not light up, Why and How to fix it ASAP? is there any NI technical support available?
Nobody can tell you why it doesn't work from looking on your picture. If you just bought it second-hand (and the seller offered it as fully working) I would request a refund and return it.
If this isn't possible because you bought it as is; contact product support: https://support.native-instruments.com/hc/en-us/categories/360000053737-Product-Support