Timeline for MacBook Pro 15-inches display not working: how to isolate the cause of the issue?
Current License: CC BY-SA 4.0
12 events
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| May 12, 2020 at 0:16 | comment | added | Allan | Yeah, that would confirm a backlight issue | |
| May 11, 2020 at 14:48 | comment | added | rudicangiotti | If it is just a backlight issue, it is reasonable to think that by placing a light beam from the rear Apple logo, something should appear on the screen? I'm asking for this hint just to do a last check. | |
| May 11, 2020 at 14:35 | comment | added | Allan | Yes. You plug it into a known working source. Unless you have a spare MacBook lying around, you have to take it in. But you can be pretty certain its the display because you're not seeing anything prior to macOS loading. Displays die; it’s possible it’s only the backlight. It’s not uncommon especially with older machines. | |
| May 11, 2020 at 14:29 | comment | added | rudicangiotti | @Allan, are there some procedures to validate the display death? I am asking for this information because - as far as I have read - it is pretty uncommon that displays stop working suddenly without previous symptoms, isn't it? | |
| May 11, 2020 at 14:22 | comment | added | Allan | If it doesn’t turn on before macOS boots, its not software. Your display died and it needs to be serviced. | |
| May 11, 2020 at 14:19 | comment | added | rudicangiotti | @Allan, it is not just a black screen but it doesn't even turn on (no light signs are visible even in a fully dark environment). Anyway, answering to your question about warnings, I did not log them and, sincerely, I don't remember anything about them if not that they were several messages and that they were printed only when launching Disk Utility from external USB drive and deactivating disk partition. | |
| May 11, 2020 at 14:12 | comment | added | rudicangiotti | @Lulucmy, I already did that before reinstalling OS. Nothing changed, unfortunately. | |
| May 11, 2020 at 13:34 | history | edited | Allan | CC BY-SA 4.0 |
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| May 11, 2020 at 13:33 | comment | added | Allan |
What were the “warnings?” Its a massive jump to go from an unknown error in diskutil to “it’s the software layer.” I wrote an answer on resetting NVRAM/SMC and reinstalling the OS. (Second part of answer) as part of the repair procedure. Its worth a read.
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| May 11, 2020 at 13:30 | comment | added | Allan |
Do you the Apple logo while booting? If you hold down the Opt ket while booting, does the boot manger interface appear?
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| May 11, 2020 at 12:57 | comment | added | Lulucmy | With the external display, can you try to go in System Preferences > Energy > Uncheck "Automatic graphics switching" ? | |
| May 11, 2020 at 12:53 | history | asked | rudicangiotti | CC BY-SA 4.0 |