While we were watching the football game a loud sound of air and screeching came from the back of the r56w36 56 in. Zenith tv. The unit powered itself off. We unplugged it and then plugged it back in and tried again, the same noise came and powered down again. The unit will turn on and then within 5 seconds shuts itself down. Please help us. Thank you
Sounds like a CRT is arching internally. to confirm remove the covers to have a view of the picture tube necks- in adimly lit room you should see bue arching in one of the tubes. (there are three piture tube with glass necks)