LG 42ld450 repair tips

[shopyd]

hello every one

i need help on repairing this tv board . P42-10LF Board EAX61124201/15 ver 1.2 t the Tv 42ld450 by LG
i disasemled the board and start it fron jumpering the conector and then started the ccfl this way too .but the problem is that it lights for 2-3 seconds and go dark .if i disconect the power and conect again it is doing the same.i checked all the component with the right instruments and did not find any defected components.

is some one deal this problem and have any sagestions.

thanks