i6S Plus backlight works when pressing CPU

I have a iphone 6s plus that has a strange problem. Half backlight but when you press on the CPU it works fine.

There are no shorts and the filters look good.

Checked the 6 pins on the LCD connector and the value is all good (500-600) and voltage is also correct.

Asked someone and he said it might be the board itself. Wanted a second opinion

Update (08/17/2019)

Gave back the board to the customer. Would take to much time to test it and for a iphone 6sp the customer didn’t want to pay a lot of money to repair it.

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