i have a celestial k18d-c4 but an annoying screensaver

[sarge1989]

i have a celestial K18D-C4 but recently something has happened and there is this screensaver with 4 smiley faces moving around the screen, it could be a child lock but i dought it because when i turn the tv on there is a picture and sound like normal then the smiley faces come up and crawl around the screen, when i change the channel it is good for about 10 seconds then the smileys again, i have lost the manual and cant find nothing anywhere, PLEASE PLEASE any help much appreciated