I have a vizio tv model m50-c1. I have audio and backlight but nothing on screen. I have replaced the t conn board and did not fix the problem. Any idea on what my next step would be? thanks

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1. Screen buffer test: Disconnect the two flex cable between the T-CON board & the screen one by one to see if one cable is disconnect the picture is come on a half a screen or not, if it does, the screen buffer board is bad that is not fixable, you need a new screen.
2. If the buffer test with no result, i will try a new main board.
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