Hi Anthony , To change the contrast settings on your KN1200 try the following .
I own as well as a KN7000  a Kn1200 and a SMAC1200 
Press  Mode set
Then press No 2
Then press contrast setting  no 5
Adjust screen contrast to suit you ,
Then press Mode set .
I've had this happen a few times , and this seems to return everything to normal .
Anyhow give it a try !!! 
  regards ...........Giovanni (norwich UK)
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Giovanni