(In need of hardware repair Help) My Sony Z3 gives no display but the sounds work!

The phone is Sony Xperia Z3 dual d6633
The problem: The phone gives no diplay but the sound is working and even when I press the camera button it gives sounds as if I'm taking pics...
Tried Solution: I replaced the LCD twice with new ones, and replaced the Main flex cable but still not working.

The phone actually was fixed before but I don't know where it was fixed. There is a thin wire wielded on the main board and I don't know where this wire should be connected! I took some pics of the main board and the weilded wire , please if you have experience with hardware or you've seen similar situation like this tell me what is the function of this wire and where should the other end be connected to?

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