pls help : vizio tv no picture only sound

Tv model: VIZIO E48U-D0

issue: NO Picture but only Sound present

test performed by me :

1) unplugged and reset by holding power button

2)FLashlight test : still no image

3) after searching a lot I replaced a powerboard : result: still issue persist

4) while back open Iturned on tv and found led light on but no picture at all

Note: there is no seperate t-con board for this model

ther is no danae to any board or capaciters or not even single burnt

NOW I KNOW VIZIO SUCKS BUT PLS HELPPPPPPPPPPPPPPPPP