Hi! I realize that you posed a couple years ago, but I am having the same problem with my relatively new Memorex MLT 3221 model. How did you solve it??? I have tried every 'layman' solution that I can think of! Please help!
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Blue screen means either no signal (if unit has rear connections hook a DVD etc to one and go to that input and see if it works) Or the blue may mean set is in shutdown----5 months old and it should still have a warranty?
Some of their very old sets the video input was located on channels in the 90's; Try scrolling down from 99 to 90 to see if you locate the video input; this is just the way they did things in the older sets.
Before you rate this solution let me know what you find first.
The way to test whether or not the television needs to be repaired is to do some things to it after it has cut off the picture. Making sure you can still hear the sound but no longer see the picture turn the volume up and down. If you can hear the volume increasing and decreasing, but you cannot see the volume indicator itself on the screen then you'll know that possibly the inverter(s) is/are loose or that the inverter board needs to be replaced. If you can see the volume indicator moving back and forth across your television screen then you might have a problem with your signal source i.e. your set top box (cable box/satellite tv box), your connecting cables or the connections themselves.
check your VGA cable is it working...because the sound is operated from the desktop PC itself and not from the screen, if sound is OK,meaning that system unit is OK but screen problem, check VGA cable. (cable from screen to PC)
If you are hooked up to a HD source if the signal is too high will cause this to happen. Normally this will happen due to signal interuptions such as signal being low will cause freeze, too high will cause it to go out and cause the TV to show default blue.
Good luck to you.