On My 70 inch vizio tv! I replaced m.Board , p.Board and t-con board

On My 70 inch vizio tv! I replaced m.Board , p.Board and t-con board

My 70 "vizio tv has a power but but nothing on screen .. only some dark blueish light coming up on screen and no vizio logo or menu title .. I search around everything and I replaced all 3 boards ( main , power, and T con board) but still same .. and the ligth strips r working too I don't know what to do anymore.. if anyone has a experience please help thx a lot

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