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1 Replaced Screen (from ifixit) only works in safe mode
Had a 2017 Macbook Pro with broken screen. Replaced the screen with the kit from ifixit. Boots fine then before I can login the screen flickers and goes black. I can still see the backlight on a bit, when I hold the power button to force shutdown I can see the screen go completely black to confirm it is off.
Ran diagnostics - no issues
Reset SMC - no change
Reset NVRAM - no change
Everything works great in safe mode however, so I’m pretty convinced it isn’t a hardware issue.
To that end, I wiped the macbook and reinstalled os (screen worked perfectly fine during this process). I even upgraded to big sur, with no problems. UNTIL I try to boot into the main os, then the screen goes black again. But everything works in safe mode.
Any ideas? I’m at a loss. The only thing I can come up with is that maybe something else was damaged when the screen was broken.
Esta é uma boa pergunta?
970 
16 comentários
What does an external display show?
This is very odd! I could see this as a 15" issue if the discreet GPU was having issues, a 13" only has the Intel graphics engine.
por Dan
External Display works fine. In fact... When I boot up with an external display connected, the macbook screen works fine. As in, it doesn't go black. So, at this moment the symptoms are:
1. Without external display, built-in screen goes black after boot up.
2. Built-in screen works fine in safe mode
3. With external display connected before boot up, the built-in screen works fine.
4. Connecting external display after boot up, the built-in screen does not come on, but the external display does work.
5. With external display connected, when shutting down the built-in screen goes red for a few seconds before shutting down.
I'm clueless...
por Adam Susong
It sounds like a driver problem. Safe mode does not load proper drivers so only the default minimum drivers are loaded. It is still running thru the same hardware. The monitor runs thru different hardware.
por bill
@ruggb - Don't think this is a driver as =that would have effected both displays. Maybe a display setting, but that would have explained if the external was messing up not the internal.
por Dan
@danj Not so much. The data for the two displays are the same. The interface circuitry are not. One drives it via data lines and clock signals. The other drives it via video. The drivers for both are different. In fact, the external monitor is operating with a standard signal and may not even have a driver.
When you first boot up, any circles are not circles since the driver isn't loaded yet. Once the driver is loaded the circles are indeed circles not ovals.
The hardware is obviously operating since it displays the low res VGA signal. The driver is also the easiest and cheapest item to verify. But if you would rather spend the money on a new display first, be my guest.
There is an outside chance it is hardware related, but the driver is the main culprit 99% of the time.
por bill
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