Digital readout (black numbers) are blurred or missing on the temp andclock

We repair these pixels depend on condition & vin number for parts availability this is common on 210

I am not very familiar with Mercedes but other car manufacturers have the same problems where the LED displays die or start to fail. There are lots of aftermarket companies that specialize in repairing dash instruments and display clusters. Google "Mercedes instrument cluster repair" to see who is in your area, call them see what their suggestions would be. For instructions to remove the cluster there is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online