My TV was working fine Friday night. I get up Saturday morning and it is still working fine. I go outside for about 10 minutes then come back inside. To my surprise my TV picture has went totally out of wack. It looks like the blue cannon is out of alignment. I tried auto converging and then manual converging to no avail. I can't get the blue to line up at all. What could have happen in the 10 minutes that I went outside? And is there anything I can do to fix it myself? Much thanks for any advice.