Toshiba 46G310U turns on for a few seconds the goes black with a horizontal line

I have a Toshiba 46G310U that when it is first plugged up it will come on for a few seconds and show a great beautiful picture, then the screen goes dark with a horizontal line across the screen that eventually fades out too. Turning the TV off and back on does not help, If I leave it unplugged for 5 minutes with the source unplugged also, it will come on when plugged back up for a few minutes at the most then starts the whole turning dark with the horizontal line that fades completely out. I've aready replaced the inverter board, the T-con board, and now I am at a stand still because I can find any help with the problem for starters(Toshiba Tech support was NO help and was unwilling to listen to my problem), second I am thinking possible power supply problem but I am having problems finding the power supply board, the main logic board, and the two small narrow boards that the T-con plugs into above the LCD display. Display has to be good for the picture to be perfect before fading to dark. Back light is also good as I can see it when the display goes dark it still has a glow and with the back of the TV off I can see the actual back light panel shinning. Suggestions? No I won't call tech support back as it was a horrible experience dealing with the rude techs. Thanks in advance.

The tech at Toshiba support was rude and seemed more interested in what was happening in the office then my issue with the TV. I've talked to a local tv service shop and they had no clue about the LCD type of tvs. I just would like to know if it is the main logic/input board or the power supply board. I can find the power board but have had no luck with the main board. Mr.. Moderator if you have any suggestions from Toshiba I would be very appreciative of your help. Thank y

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Toshiba 46G310U turns on for a few seconds the goes black with a horizontal line

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