I just replaced the battery in my old Surface Pro 4. After reassembly, the device powers up and the backlight comes on, but nothing comes up on the display. I have connected it to an external monitor and confirmed that it is booting to the OS. I have also confirmed that the touch functionality is still working, by mirroring the main display with the external.
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If I’m not mistaken, when you disconnect and reconnect the battery in certain surface models, it blows a fuse for the image circuit. That or you could’ve damaged the display.
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Have a detailed look at the connector under the microscope. I‘ve had no touch and found a stucked pin inside the connector on the board. Maybe this is the same with your connector.
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I'm having the same issue, i get a subtle backligth but no image. Maybe related to a damaged ribbon flex cable?
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