Questions tagged [power]

The electricity drained by a device

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25 views

Macbook Air doesn't turn on [duplicate]

I have a 2017 Macbook Air 2017. A week ago I turned it on and wrote my password, then it shut down. I tried to turn on but nothing happened. I read some posts on the Internet and tried the following: ...
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50 views

MBP 2015 Sierra strange behaviour while hibernating

I noticed that my MBP early 2015 with Sierra OS X drained a battery quite a lot overnight. I did some research and my pmset settings are like this: Here is a screenshot of pmset -g log | grep ...
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1answer
92 views

Can I use a DC 60W 18v 3A solar pannel to power my macbook pro 15" retina mid-2012?

I have found this solar pannel ( https://fr.aliexpress.com/item/Suaoki-60-w-Panneau-Solaire-5-v-USB-et-18-v-DC-Sortie-Portable-Pliable-Puissance/32935273533.html?spm=a2g0w.search0104.8.83....
4
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1answer
882 views

Can't hibernate computer MacOS Mojave, no pmset “standby” option

I have a Mid-2009 Macbook Pro 17 inch (5,2), with MacOS Mojave 10.14 installed. I want to enable hibernation (or standby, or deep sleep, or safe sleep) in order to power off the RAM when in sleep mode....
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1k views

iPad Pro Won't Turn On

iPad Pro was fully charged. Upon going to bed I set alarms as usual. No alarm in morning and iPad will not turn on. When I try to recharge the back gets quite warm. I tried restarting by pushing both ...
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1answer
68 views

What are the electrical requirements for magsafe charging?

I'm supplying power to a MacBook Pro via a magsafe cable from a broken 60 W power supply. Is it safe (1) to omit the initial high impedance 6 V or 3 V and simply apply "14,5V to 18,5V on Magsafe 1 ...
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3answers
3k views

Keep low power mode on all the time

I would like Low Power Mode to be the default state of my device. When I get to 80% battery it toggles itself off automatically. How can I stop it turning itself off? How can I always keep my phone ...
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1answer
319 views

Burned magsafe dc in board ports: Replace, even if working?

I have noticed that two of the pin plugs on my magsafe dc in board, the ones, which are for power are blacked. As far as I know, this is due to moisture. Right now everything is working fine, however ...
3
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3answers
2k views

How safe is it to replace the magsafe 2 connector with another one by simply connecting the wires?

I have a problem with my magsafe 2 adaptor, it has been stopping to work occasionally for a while now. Until now I always managed to get it to work by yanking the cable (in order to unstuck the pins), ...
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1answer
1k views

What would happen if I plug in two USB-C power supplies into the same Mac? Would it charge faster? [duplicate]

I have a bunch of USB-C power supplies (some at different wattages). Would my Mac charge faster (or blow up) if I plug two power supplies into the same computer (different USB-C slots)
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2answers
178 views

Does it look like a Fake iPhone 6 or original? Specially The accessories. I'm confused with power adapter (rounded Pin)

Does it look like a Fake iPhone 6 or original? Specially The accessories. I'm confused with power adapter (rounded Pin). I have only this two images. Thanks I just needed info on the USB charging ...
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0answers
265 views

MacBook Pro A1278 keyboard works but power button doesn't

I have a MacBook Pro (mid 2012) A1278. All the keys work except the power button. I've tried different keyboards (i.e., plugging in internal keyboards to test the power button). None of the keyboards ...
1
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1answer
36 views

Mac runs as long as plugged in, but unpredictably shuts off otherwise - clock resets

I have a MacBook Pro, as shown in the image below. Also, as I think it might use a lot of power, I run Ubuntu on a vagrant machine to test website apps. Recently (last 2-3 months), the battery would ...
3
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1answer
75 views

My MacBook Pro touch bar 13" isn't starting

My MacBook Pro touch bar 13" isn't starting and here's what I'm seeing: 1) No power - I can't hear blowers or any sound or see any activity on the backlight when I press the power button/touch ID 2) ...
2
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1answer
178 views

Power consumption of iMac

All other things being equal, what is the difference in power consumption of iMac with 8GB of RAM and iMac with 16 GB RAM?
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2answers
140 views

How to backup SSD if MacBook doesn't turn on?

I have a MacBook Pro 15" Mid 2015 and after 3 years of using it, I think it is broken since it won't power on. I already tried resetting SMC and NVRAM but it's still not working. I don't hear any ...
3
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1answer
967 views

USB-C Power Injector

I was wondering if a device exists for this yet: I have a normal screen that currently as an AUKEY HDMI to USB-C running from it to my 2017 MacBook Pro. It works well. I charge the laptop with the ...
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1answer
491 views

Does IFTTT app drain battery faster in iPhone (and Apple Watch)?

The IFTTT app sounds interesting with endless possibilities. I have just installed it but skeptical about using it because of the possibility of battery drain. The app has to keep track of every event ...
1
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1answer
8k views

What is the maximum wattage an iPhone X will support for wireless charging?

The existing chargers on the market are all either 5W or 7.5W for their charging capacity. While higher capacity chargers dont exist on the market, what is the theoretical maximum that an iPhone X ...
2
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0answers
20 views

MacBook early 2009 power issue?

I have been on here quite a lot with all my issues. I have a project MacBook (early 2009, a1181, which is running OSX High sierra and Ubuntu along with a bootloader, refit or fEFInd, can't remember at ...
2
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1answer
40 views

Is it safe to use 2 Power sources into a MacBook Pro 2016 15"

I have a 4k monitor that has power over usb-c but it is only supplying 15W instead of what it advertised of 60W. So I was wondering if I could charge my Mac with its 87W power supply while having the ...
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2answers
3k views

MacBook Air won't power on

My MacBook Air won't turn on. I plugged in the charger and it says it's charging. When I turn it on, the light instantly turns green for a few seconds, and then it goes to amber. What's going on? I ...
2
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2answers
2k views

iMac with a dead internal drive being used as a second monitor - booting and power efficiency

I have an old 2012 iMac12,2 which had a fatal hard drive crash in early 2018 and has been running via booting from an external hard drive. I have connected the 2012 Model to a new 2017 iMac18,3 via a ...
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2answers
3k views

Macbook Pro Battery 0% and wrong date

Model: MacBook Pro Retina, 13-inch, Early 2015 While I was working, I didn't realize that the battery was low and as a result, my MacBook Pro shut down when the battery had no power. So, then I ...
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1answer
167 views

On iPhone 5s, can the battery itself be the cause of fast draining, even after a brand new U2 chip is installed?

My battery was draining very fast even when UNUSED and in LOW POWER MODE. This was happening even in AIRPLANE mode (i.e. overnight, unused, in Airplane and Low Power Modes both enabled). I got the ...
3
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1answer
126 views

Change what percentage/time remaining causes the battery icon on Mac to go red

I'm dead broke. So, I have a cheap battery for my dead-broke-esque 2008 MacBook. It only lasts about 2 hours on a full charge. However, it's a little goofy at times. Not in a dangerous way, just that ...
7
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1answer
799 views

Are Macbook Pros with a rusted / corroded MagSafe port safe to operate?

So I have MacBook Pro 13" 2015 and when I connect the MagSafe power connector to it, it seems like it’s more difficult to charge. So I check the MagSafe port and want to clean it I think. When I ...
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0answers
281 views

My iMac automatically/mysteriously powers off when on standby. How can I make it not power off?

Our iMac randomly powers off while on standby. I put it to sleep, come back, and it is powered off. I need to reboot it, which is a long process. The iMac is at the newest operating system and it is ...
2
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0answers
30 views

iPhone not recognized by MacBook 12"

I want to connect an iPhone 6 to my 2016 12" MacBook. I have a USB-C to USB-A adapter. If I connect the iPhone, macOS shows a warning (translated): USB device requires power (Note: It just says power,...
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1answer
4k views

Do I need a voltage converter for Japan, for MacBooks or USB devices?

Japan uses 100V; I will be in parts of the country using both 50Hz and 60Hz. Will I need a voltage converter for a) a MacBook power supply, b) a standard AC-to-USB plug? I live in the U.S.
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1answer
121 views

What happens if I use a 60W rated USB-C cable to charge my Macbook from the 85W power brick?

Will they still be able to negotiate the correct charging amount of 60W and not overload the cable?
3
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1answer
1k views

A1502 Late 2013 MacBook Pro will not boot, one exception

The ONLY time it's booted since it's been in my possession was when it was in the Apple Store, when it ran the Apple Diagnostics. What I've tried is: resetting the SMC (no reaction) using power on ...
3
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1answer
143 views

Late 2008 13" MacBook not detecting brand new battery

I bought a broken late 2008 13" Aluminum Unibody MacBook on eBay. Supposedly, according to the listing, Apple had said the original battery needed to be replaced. The other issue was the slightly-...
2
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3answers
71 views

Did Sierra's latest security update brick my device?

I have an mbp mid-2012 running the latest Sierra. I installed the latest update which attempted to restart the machine. The usual progress bar was showing and then it shut off. Curiously, it didn't ...
7
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3answers
22k views

“Battery not charging” on MacBook Pro

I have the infamous "battery not charging" problem on my 2014 Retina MacBook Pro. The power source shows as "Power source: power adapter". I checked system info and I have 1100+ cycles, which I guess ...
3
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1answer
1k views

Shut down system without superuser permission

The following command causes an immediate system sleep pmset sleepnow Trying to shutdown system with pmset $ pmset shutdown Usage: pmset <options> See pmset(1) for details: 'man pmset' ...
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0answers
13 views

Power button does not work! MBP 2011 [duplicate]

Overnight, my MBP would not power on with the power button. The Battery was full and the LED on the charger was green. SMC Reset did not bring any results. So I opend up the Mac, disconnected and ...
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0answers
48 views

early 2015 13 inch macbook air shuts off when disconnected to power [duplicate]

my macbook air shuts down 0-30 seconds after I unplug it from the magsafe. the computer says it's at 90%, and charging; I did an SMC reset, ran apple diagnostics (no issues detected), cleaned the ...
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0answers
181 views

Can I force my MacBook to only charge from the USB-C device I select? Or forbid it from charging from devices I know to be unreliable?

For some reason, my MacBook keeps trying to charge off of my external display's USB Type-C ("USB-C") link even though I have a more powerful source connected. I care because the monitor is ...
2
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2answers
6k views

MacBook randomly shuts down [duplicate]

This is likely the same problem I saw reported countless times. However, mine comes with a twist, so I wonder if anyone can provide extra insight. Briefly, my laptop randomly shuts down (I think it ...
2
votes
1answer
48 views

iMac 5k 2014 won't boot/turn on

Looking for ideas on how to fix my iMac, it's a 5k 2014 that will no longer boot. It all started one morning when I'd put it to sleep the evening before, when trying to wake it, nothing happened, and ...
1
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1answer
98 views

After heavy use, my big iPad has charged very slowly. What can I do besides the Genius Bar? Is there a different wall charger I should use?

During an inpatient stay, I had my 12.9” iPad Pro(Model A1652 EMC 2827), which I tried to use much of the time I was awake. The battery was depleted most of the time: I had it plugged into a wall ...
6
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1answer
4k views

Double sound notification when plugging in iPhone X with Fast Charge

I recently purchased an iPhone X, and along with it I also purchased a 29W USB-C Power Adapter and a USB-C—Lightning cable. This setup is supposed to enable Fast Charging of the iPhone X. However, ...
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0answers
1k views

Iphone 6+ USB disconnects from Macbook Pro constantly over and over

My iPhone keeps disconnecting from my MacBook Pro; in fact any iPhone I try to connect (and with different cables) can never connect to it. I am very familiar with command line and Linux so please if ...
7
votes
1answer
481 views

How to select power direction over USB-C

I have a USB battery which has a USB-C port on it. When I connect it to my MacBook Pro (regardless of whether the MacBook Pro is running off its battery or via the mains), the Mac doesn't charge the ...
1
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1answer
22 views

Phone data security when plugged in to hotel power supply

is it true that only Apple chargers are secure from data theft from your phone through electrical systems such as in a hotel or coffee shop? I was told that you should never use a non-Apple phone or ...
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0answers
62 views

Weird Linux and/or MagSafe charger glitch

This is... confusing to say the least. A few months ago, the battery in my 2010/2011 MacBook Pro completely died, complete with a Permanent Failure Flag. Today, I replaced it, and things are really ...
0
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1answer
485 views

MacBook Pro 2016 won't charge even on power adapter

I'm using the CalDigit USB-C Dock and the Mac said it is using the power adapter, but my battery is slowly draining: I did an SMC reset and reset PRAM (NVRAM) but still won't charge. Why isn't my ...
2
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2answers
981 views

Is it okay to use non-OEM USB-C cable and/or adapter for Macbook Pro?

Is there anything special about the Apple USB-C cable, other than its quality, that would prevent me from using a USB-C cable from another brand? And the same question for the wall adapter.
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2answers
469 views

Macbook Power Adapter Prongs Burnt

I was travelling in China with my Macbook and USB-C Power Adapter. While plugged in at a hotel, the prongs of adapter got burnt. Is it okay to just replace the prongs, or is it likely that the ...