: MagSafe green light blinking


krs
May 1st, 2018, 11:45 AM
I have a MagSafe charger where the green light is blinking - never had that before in all the years I have owned Macs.I wonder if anyone knows what that means.

I have already gone through all the normal steps, resetting things on the Mac etc.

If I plug in another MagSafe charger everything works fine, so that suggests the Mac and battery are OK.
Don't currently have another MacBook Pro to check the charger on it - will have a second one next Saturday.

But in the meantime - has anyone ever come across this?
Green light is just blinking on and off at a steady rate of about twice a second, no orange.

Closest I can find on the net is this - but no conclusion there:
https://forums.macrumors.com/threads/dead-macbook-pro-blinking-green-magsafe-no-orange-wont-charge-wont-turn-on.1048433/

CubaMark
May 1st, 2018, 01:05 PM
...and you did an SMC reset, yes?

A couple of other threads to try:

https://www.ifixit.com/Answers/View/399244/MagSafe+blinks+green+and+doesn%27t+charge

https://www.ifixit.com/Answers/View/204364/Not+charging%2C+blinking+green-orange+light

Also:

MacBook model / year ?
Did you check the Cycle count on your battery?
Press OPTION while clicking the battery icon in your menu-bar should return a Condition: indicator (Normal; Replace Soon; etc.).
Also a "System Report" (About this Mac) under "Power" will give you your battery specifications, cycle count, etc.


Lastly: Did you examine the end of your Magsafe cable for debris?

krs
May 1st, 2018, 02:28 PM
Yes - I have done the SMC reset.

Actually just did it again - no difference

MacBook is a 15-inch 2.4 GHz core 2 duo early 2008 running 10.6.8
Battery cycle count with coconut battery is 444 - capacity shows at 51%
Condition shows "Replace soon"
MagSafe connector looks fine.

I have had my share, maybe even more, of these Apple chargers go south - just never had one that has decided to quit with a flashing green light.

Once the other MacBook Pro is back, it's a bit newer model, a 2011, I would be able to determine for sure it's a charger issue

Otherwise that MacBook Pro runs very well.
10.6 definitely has a lot fewer sotware issues than 10.11 which is what I'm running on the othder Macs in the family.

This 2008 was put together from a few other 2008's where one had a keyboard issue and the other a display issue.

Now I need to get another display bezel to put together another older 15-inch MacBook Pro - the bezel seems to be a weak point in the design, cracks at the bottom outer edges.

CubaMark
May 1st, 2018, 03:05 PM
MacBook is a 15-inch 2.4 GHz core 2 duo early 2008 running 10.6.8
Battery cycle count with coconut battery is 444 - capacity shows at 51%
Condition shows "Replace soon"

My 13" 2008 model is still going strong, though missing a couple of keys :)

Your cycle count is less than half my mid-2013 rMBP :)


I have had my share, maybe even more, of these Apple chargers go south - just never had one that has decided to quit with a flashing green light.

I've had two of my laptops - the late-2008 MacBook Unibody, and a late-2011 MacBook Pro - both fail at the DC-in board (what's behind the magsafe port on the laptop). iFixit walked me throug (https://www.ifixit.com/Guide/MacBook+Unibody+Model+A1278+DC-In+Board+Replacement/768)h replacing both of those, successfully, though it's not for the faint of heart (good toolkit a must).

krs
May 1st, 2018, 03:48 PM
Your cycle count is less than half my mid-2013 rMBP :)

My cycle count is unusually low because that 15-inch MacBook Pro was replaced with a 13-inch one in 2012 or so and then just sat.


I've had two of my laptops - the late-2008 MacBook Unibody, and a late-2011 MacBook Pro - both fail at the DC-in board (what's behind the magsafe port on the laptop). iFixit walked me throug (https://www.ifixit.com/Guide/MacBook+Unibody+Model+A1278+DC-In+Board+Replacement/768)h replacing both of those, successfully, though it's not for the faint of heart (good toolkit a must).

What were the symptoms when that happened?

I assume right now everything is fine with the MacBook Pro since a different charger works properly -
short delay in MagSafe light coming on when MagSafe is plugged in
steady orange while charging
green when fully charged

Moscool
May 2nd, 2018, 04:35 AM
I've had my share of no light/green-orange alternating and no charging taking place when it should be charging; but not the green blinking. Did you check the physical route? - Q-tips with contact cleaner, pushing the tips down with a toothpick to loosen the springs etc. ?

pm-r
May 2nd, 2018, 01:52 PM
But in the meantime - has anyone ever come across this?
Green light is just blinking on and off at a steady rate of about twice a second, no orange.


Is the MBPro getting a charge and is the battery charged to full capacity and charging as it should?

If so I wouldn't worry too much about it.

What does Coconut Battery.app show???
https://coconut-flavour.com/coconutbattery/

krs
May 2nd, 2018, 02:46 PM
I've had my share of no light/green-orange alternating and no charging taking place when it should be charging; but not the green blinking. Did you check the physical route? - Q-tips with contact cleaner, pushing the tips down with a toothpick to loosen the springs etc. ?

Pins seem to be OK.
Look and feel the same as the one that is working.

However, I haven't checked the voltage on the green flashing one - it's supposed to be a bit over 6 volts when idle.

krs
May 2nd, 2018, 02:51 PM
Is the MBPro getting a charge and is the battery charged to full capacity and charging as it should?

If so I wouldn't worry too much about it.

What does Coconut Battery.app show???
https://coconut-flavour.com/coconutbattery/

MBp charges fine with the good unit - doesn't charge at all with the one that has the green light flashing.

I'm just trying to figure out what the green light flashing means - it has to be something built into the chip that is inside the MagSafe connector.
Years ago I came across a website that explained in nitty gritty detail the handshaking that takes place when a MagSafe connector is plugged in but trying to find that site again will be a challenge.
That site may cover the flashing green light - I assume it means something along the lines that the handshake didn't complete successfully

Moscool
May 2nd, 2018, 03:30 PM
krs, I had a look at French sites to check if there were different answers

- If your Mac is old, try and remove the battery and operate it directly from the power supply
- Even if this doesn't work, removing the battery for a couple of minutes is supposed to help
- Try the charger with and without the extension cable
- The Apple site gives close-ups of connectors to check cleaning here (https://support.apple.com/fr-fr/HT203207)

Otherwise answers are as per what you have already tried. Take it to an Apple shop and test it on one of their machines.

hexdiy
May 2nd, 2018, 07:44 PM
@ krs: I assume you mean Ken Shiriffs blog?

Macbook charger teardown: The surprising complexity inside Apple's power adapter (http://www.righto.com/2015/11/macbook-charger-teardown-surprising.html)

Teardown and exploration of Apple's Magsafe connector (http://www.righto.com/2013/06/teardown-and-exploration-of-magsafe.html)

Nothing about a Magsafe 1 wire chip causing flashing green there as far as I can see...

hexdiy
May 2nd, 2018, 07:51 PM
Otherwise, try a search term like

"apple magsafe flashing green"

Lots of hits on that!

Try a different mains outlet and / or a grounded power cable.

Good luck

krs
May 2nd, 2018, 11:00 PM
@ krs: I assume you mean Ken Shiriffs blog?

Macbook charger teardown: The surprising complexity inside Apple's power adapter (http://www.righto.com/2015/11/macbook-charger-teardown-surprising.html)

Teardown and exploration of Apple's Magsafe connector (http://www.righto.com/2013/06/teardown-and-exploration-of-magsafe.html)

Nothing about a Magsafe 1 wire chip causing flashing green there as far as I can see...

Yes, that's it, thanks

krs
May 2nd, 2018, 11:03 PM
Otherwise, try a search term like

"apple magsafe flashing green"

Lots of hits on that!

Try a different mains outlet and / or a grounded power cable.

Good luck

Most of the supposed fixes involve disconnecting and reconnecting the battery.

I have done that a number of times already with no change.
And I have one charger that works fine with that battery and that Mac.

However, I have another MBp coming on the weekend which is newer with a newer battery so I can try the charger with that and seewhat happens.

pm-r
May 3rd, 2018, 01:28 PM
MBp charges fine with the good unit - doesn't charge at all with the one that has the green light flashing.

I'm just trying to figure out what the green light flashing means - it has to be something built into the chip that is inside the MagSafe connector.

I'd say you got your answer the charger is FUBAR and the flashing green light is trying to get your attention (it worked too) to let you know it's not working or charging properly.

Another example of Apple's Help/info not relying to the user a feature their engineers included maybe.

krs
May 6th, 2018, 12:28 PM
I now tried that charger with the flashing green light on the newer MBp.
The battery cycle count on it is actually higher at 549 but the battery condition shows as "normal"

In any case, flashing green is the same.

But doing a bit more digging on the net, I think I may have the answer - at least part of it.
On one of the discussion groups a former Apple tech person responds to the question about the flashing green LED.
His comment was that a flashing green is and never was a state generated by a genuine Apple MacBook charger....and sure enough, when I look at that charger with the flashing green LED, it is not an Apple unit even though one would be hard pressed to tell the difference.
The key thing I find, even if the Apple logo and text is everywhere, is that the knock-offs don't have that 1 second delay.

End of story.