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Problem w/ Mac Screen Lighting Up
Old 07-13-2019, 06:52 PM   #1
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Problem w/ Mac Screen Lighting Up

Strange problem........normally when I raise the lid on the Mac, the screen lights up instantly. On occasion it remains dark for many seconds........
Yet it will act normally if I close/raise the lid again.

I know the Mac thinks the battery should be replaced but it works fine for my purposes .........guessing it will last 1-2 hrs before down to 80%. At first I thought it did it because the battery was low but it has done it when 100% charged.
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Old 07-13-2019, 07:42 PM   #2
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This not the forum you were seeking.
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Old 07-13-2019, 07:54 PM   #3
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Sounds like a faulty connection to backlight?
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Old 07-13-2019, 09:18 PM   #4
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My 2010 Mac does that sometimes, I just hit the space bar a few times and it wakes up. It's not bothersome enough to have ever look for a fix.
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Old 07-13-2019, 10:43 PM   #5
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My 2010 Mac does that sometimes, I just hit the space bar a few times and it wakes up. It's not bothersome enough to have ever look for a fix.
Thanks.....I'll try that next time. I've hit other keys w/o success......return/enter key, etc.
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Old 07-14-2019, 04:05 PM   #6
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I believe you are seeing different wake times because of display sleep vs. computer sleep. It only takes 3 seconds to wake the display vs. 30 seconds if the computer is sleep (depends if you have an SSD vs. regular hard drive),
More info https://support.apple.com/guide/mac-...0.13/mac/10.13
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Old 07-14-2019, 04:51 PM   #7
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Quit closing it. I suspect the hinge mechanism eventually wears out. Your Mac is probably pretty old if the battery needs replacing?

Hit the space bar to wake it up instead?
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Old 07-14-2019, 09:10 PM   #8
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Lots of support stuff online ...

https://support.apple.com/en-us/HT204760
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Old 07-15-2019, 09:21 AM   #9
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Originally Posted by stephenson View Post
Lots of support stuff online ...

https://support.apple.com/en-us/HT204760

Yes, when I had this exact issue on my last MBP, I had to reset the SMC and/or NVRAM, I forget which, but that fixed it.
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Old 07-15-2019, 05:04 PM   #10
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Thanks all for the tips. Now I know why my google search was not successful........I failed to use the technical term "sleep".

So far no luck w/ the space bar trick. Seems to awake after some 20 secs
w/, w/o the space bar............when there is a delay. Usually it's ok.
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Old 07-15-2019, 07:33 PM   #11
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Quote:
Originally Posted by kaneohe View Post
Thanks all for the tips. Now I know why my google search was not successful........I failed to use the technical term "sleep".

So far no luck w/ the space bar trick. Seems to awake after some 20 secs
w/, w/o the space bar............when there is a delay. Usually it's ok.
I'm not so current on Mac issues, but I seem to recall there is "sleep" and "deep sleep". And I think "sleep" means it mostly shuts down, but keeps everything in RAM powered, so it is fast to wake up.

"Deep Sleep" is what some of us call "hibernate", where it writes RAM contents to disc. This allows it to wake up again, even if it lost power during "deep sleep" (losing power would also lose RAM contents). But it takes time to read the contents back from disc. Twenty seconds is a good ballpark for that.

Maybe some Mac people can chime in on how sleep/deep-sleep is triggered or if there are settings to control it.

-ERD50
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