KDS monitor pincussion issue
 

Hello,

this my first time in this forum. I am a high school teacher. A parent came by, fed up with his monitor and said : if you can fix it, it's yours! So here is the problem :

when the monitor is first used, everything goes fine. But after 3 minutes in use, the sides curle in like a pincussion effect. The initial quality of the image out of this monitor is terrific and this is why I was hoping if someone would know how to fix this.

I tried opening up the monitor and tweeking the controls. As soon as the screw driver touched the outer metal panel, the monitor would respond with the image going back to it's good look.

I don't know?!?!

Help?!?