Display not working after cleaning keys

Hi Folks, recently I cleaned my ctk-3000 because some keys were not working, now all the keys are working fine but after that i noticed that the display is not coming on the screen, what could be the reason?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0