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kohsamui100

macrumors member
Original poster
Dec 21, 2016
81
1
My MBP screen suddenly started showing thin black horizontal lines all over from top to bottom, sometimes with shades of "underneath" icons and images, as on these pictures. It works flawlessly up until now, although it fell on the floor a year ago and got a dent on one corner, but there still weren't any monitor issues until I got those lines.

- If I connect an external monitor, the lines aren't showing on it, but still show on the MBP monitor
- The OS is Catalina, updated to the latest version available
- The lines show also if I just boot to a rescue disk, and over the apple logo on boot
- If I switch from the Intel to the Raden GPU using GFXcardstatus, the same problem still appears with either of the cards
- I reset the NVRAM and SMC a few times with no help
- D on startup (Diagnostics) says everything is fine

I've been using macsfancontrol since day one and the mac almost never heat up.

Is this a GPU/Ram/Bios issue? Bad GPU or capacitor near it (as on the 2010 model)?
or the screen really needs to be replaced? or possibly a loose monitor connector?

I don't want to get a new screen and then find out it's not the actual cause...

Thanks
 

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cmaier

Suspended
Jul 25, 2007
25,405
33,473
California
It’s more likely somethign on the board and not something specific to the screen (though there’s a small chance it’s related to the ribbon cable). I’ve seen this on several MBP’s over the years, and each time it’s been a GPU problem. But there are many possible causes that match your symptoms.
 

kohsamui100

macrumors member
Original poster
Dec 21, 2016
81
1
I found it to be flexgate. The screen is ok when the lid is half-open, then you'd move it 1mm and it would show up.

I wonder if someone knows a reliable source for a replacement screen which is not expensive and doesn't fall from the apple original retina. Or an original replacement part...


thanks
 
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