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I know this isn’t going to be the answer you want to hear, and it’s certainly not what I want to tell you. However, I wish to be completely honest with you, so I feel obligated to not give you false hope.In almost every case like this, either the LCD screen is defective or the cable, which connect the screen with the mother board is defective or loose, but in both cases, you have to completely dismantle the laptop and check the connection and the screen. I will not recommend you to do that, if you do not have any previous knowledge in dismantling laptop, otherwise if want to do it and let me know.
Can you tell me, on what you do not agree ?