fojitech(chasis 17mb22-2)model hd3200

[WILLYAM1]

Hi everyone.
problem is no picture sound o.k.
power supply all voltage are ok 12v 24v 5v 3.3v.
back light is on  and inverter is working.
no picture no o.s.d.
main board is 17mb22-2( 3.3v 1.8v 5v 8v all ok in main board)is the problem in main (control ) or in lvds board.
anyone hade same problem??? plees need help.
thanks willyam1