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LCD and End stops not working

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    LCD and End stops not working

    Replaced main board with V1.7, replaced LCD, x,y,z axis work correctly, bed heater and extruder heater work correctly. Loaded Marlin 2.1 and burned anet a8 opto boot. LCD is blank blue lit no text. X, y and z Axis limit switches work but the motherboard doesn’t recognize them. What do I do next?
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