Bush led le-46gl12e trips out

Warbeast

I have a bush le-46gl12e that turns on with backlight but just before showing the blue screen it trips out restarts for up to a hour in a loop untill finally it shows a image and stays on if I disable the blue screen it boots faster maybe 4 restarts I have another tv same model so have swapped the psu and mainboard this didn't help so any ideas would be great thanks