I have problem with my TV. When I switch on the TV, its on. But after a few second its off and its on again. This happened when I switch to TV mode. When using AV its quite OK. Did anybody can help me?

And one more thing, my other TV, it cannot be swtch on. It sound something when plugged is on. Did anybody knows about did. Is it because of the big capacitor at the power board? The fuse is OK...

Please anybody can help me>>>>