Question edited for clarity, full 'make model (what it is)'.
This is an Amazon, eBay, Newegg, Overstock special and basically a device without a maker. There is a South African minerals company that share the same name but no Mintek maker of electronics. The only option would be to take it to a computer or electronics repair shop locally and see if they can diagnose. It is likely to be something simple like a failing capacitor.
https://www.google.com/search?q=mintek+mdp+1030+dim+screen
https://www.mintek.co.za/
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