Why is my motherboard making noise when I connect the flexes?

I connect my flex for picture on lcd and then it makes noise. There was some water on the battery when i opened but i try with different battery and lcd also.

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was the battery disconnected and the board drained? Was all water removed before reassembly

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Yes i changed chassi with all new except motherboard.

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I found out the screen is making this problem. With original screen no sound in motherboard with aliexpress it makes sound in motherboard..

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the device had water in it? what are you connecting for the device to be noisy

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