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Hello, My MBP starting normally, but after few seconds the screen turns to black and back to normal over and over. Fan is still spinning. Just screen is dimming or on/off. Sometimes, while screen turns to black mode, touch pad is stoppage or acting slowly and keyboad backlight led is not working. It also on/off depending on screen status.
What shall I do check the first? Thank you for your any advice!
I fear your logic board is liquid damaged! Let’s check it out, follow this guide MacBook Pro 13" Retina Display Mid 2014 Display Assembly Replacement follow the fist steps to disconnect the battery stopping at after Step 6. Now jump down to Step 11 disconnecting the internal display cable. Now you need to inspect both the cables contacts as well as the the sockets solder joints for any corrosion, staining or damage.
Post a couple of sharp images if you are not sure Adding images to an existing question
