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Display options....Invert?
It may be as a bad connector to the LCD. Gently poking around with a pencil on flat flex cables and connectors near/on the screen can identify this. A problem that looks this consistent suggests it may be a fault in a parallel signalling interface (where one bad connection causes ~1 fault), so the cables with the most traces are the ones you should be looking at.
5. The warranty is void if: (1) Accidental damage occurs during transportation (please confer with insurance agency or transportation company on the compensation).(2) Malfunction or damage is caused by misuse according to warnings in the product documentation or using or storing in an environment outside of the specification’s limits.(3) Surface damage by manmade factors, like burn, distortion by force, etc.(4) Repaired by anyone who is not from RIGOL Maintenance Center or an authorized maintenance branch.(5) Accident damage caused by using a power cord or a power adapter not approved by RIGOL.