After powersurge no light on magsafe+no charge. Board or PwrSupply?

Power went out today and the house got got a surge when power was restored. Bedroom light was much brighter than usual for 30 seconds or so. Misc. cheap Household powerstrip got fried+microwave oven no longer works. My MBP17 was running at the time and I didn't think to quickly power down when the power went out. I didn't realize till later that the magsafe was not 'green'. I always run off the powersupply. The MBP and 3 external drives are plugged into an inexpensive 'protected' powerstrip. Had no trouble with any of the hd's. I bought the powersupply a couple months ago, 'reconditioned' frrom OWC. Could it be a bad PS and just bad timing, or maybe a bad magsafe board? I don't have access to another PS. How do you check voltage with those little pins in the T-connector? Different voltage per pin? Or same v accross them all? Thanks for any help!

-Mike

MacBook Pro17" a1229 Last 5 SN# digits- ...R9YAN

More info...I tried other sockets on the ps, different outlets in my room and others around the house. I get no light from the magsafe LED at all. The MB ran just fine until the battery ran out. I was playing with garageband until I noticed the low battery, and then realized the magsafe's green light was out. No orange or red either.The battery doesn't last long at all, so I keep it plugged in 99% of the time. I'm hoping the ps is the problem and the logic and left I/O boards are undamaged. I guess I need to find someone with a MBP I can test the ps on...

Answered! View the answer I have this problem too

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What are the last 3 characters of your serial number so we can determine your exact machine?

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Just came back from a mac store+repair shop. Had the tech plug my magsafe into a much nicer macbook pro...No Light! Power supply is dead.

I'm hoping a new PS is all that I need.

-Mike

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Good I am glad to hear that, good sign.

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1)If the Magsafe is operating properly it will not be putting out any voltages until it is enabled by the SMC. To test if Magsafe is good the voltage tests are done from the DC In Board on a known good Apple laptop, as the SMC needs to activate the Magsafe. It is kind of a Catch 22. Have you tried plugging it into a different socket on the power strip? What color if any are you getting from the Magsafe LED? If it is orange or red that means it is charging. On some MBPs the battery needs a 15% or greater charge before it will power up. If it is charging leave it plugged in for an hour (The battery should tell you it's level of charge) then try to power it on. If it powers on problem solved. If it doesn't see 2).

2)The Magsafe should (even aftermarket) have protective circuitry in it, making it die before it kills the notebook. If the Magsafe has no light either it is bad or the SMC can't see it to activate it, in that case I recommend you test the Magsafe on another MBP. If you can't access another MBP then replace the Magsafe. - No further troubleshooting can be done without a known good PS.

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I have fixed one MacBook charger with the same issue.

Steps -

  1. Identify the fuse (T3.15A 250V) near the AC input.
  2. Just check the continuity of fuse with multimeter.
  3. If no continuity, you have found the issue.
  4. Just connect the fuse's end with a jumper wire.
  5. Plug the charger and test the output. It should work.
  6. The charger will work like this but for future protection try to get the same fuse from market and replace with jumper wire.

I will be posting the pics soon.

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thank for the post. did you ever post the picture? I am in the middle of trying to identify the blown components on my dead power supply. Regards.

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Maybe a little late, but maybe someone has similar issues.

The MagSafe adapters have a 3 Stage surge protection builit in, consisting of a fuse, a varistor and a thyristor. Either or all of them will act to prevent the power supply or the notebook from suffering any damage.

In my case all of them were blown which I found our after opening the case. There are plenty of instructions on how to do that on the internet.

Just to test the charger I hard-wired the circuit and oh wonder: Everything came back to life. Now I ordered the spare parts for a handful of euros which should take care of everything.

Reminder: Don't do this if you don't know what you're doing.

Cheers

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Hello Chris,

I am trying to repair my Magsafe PS, because I believe I have a similar problem than you. I opened the case up and would like to identify the surge protection elements to bypass them and try if it works. Could you tell me how did you do this?

Thanks!

Joe

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Hey Joe,

just follow the current path from the AC input. It is hard to say what the individual parts look like, because Apple's supplier keeps changing the design with every generation. I have not opened any two similar chargers yet.

FUSE: Can either be SMD, so you will find a white little rectangle, or a regular mounted device in which case it should be a little red box. It should be marked "F" on the circuit board

VARISTOR: Is a disc shaped device, 12mm in diameter and 3 mm thick. Can be blue, yellow or red

SIDAC (THYRISTOR): looks like a regluar transistor with only two pins.

Best of luck and be careful!

P.S. If the surge protection acted you might find it more easyly by following the traces of black soot in the case.

!BATTA!

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Hey Batta Batta (like the african song ;),

thank you for the response, I founded all the three components using your descriptions, they looked exactly as you said. I got rid of all three and hardwired the circuit, but nothing happened. The connector's leds do not light up... So I gave up thinking that the problem was the adapter. I have just ordered a new mag safe power supply, so at least I'll know that that part of the problem is out of the picture.

The question now is: what is next? If the power supply was not the reason, what and how should I investigate now?

Just to say that my battery died months ago, not before it slowly inflated as a ball for weeks. This is a known problem at apple, and it happened to me twice. The first one i got it changed by apple, the second was out of guaranty... So I had to run plugged to the wall for months. I think now that this may have caused the problem.

The thing is, that one day the computer decided not to power on anymore, and it's been darkness ever since... What could be the issue, would it be fixable? What do I do now? What is clear is that I will try to repair it myself, since nobody seems to have interest to being paid of for that. And i also like the fun of it.

Any sugestion is highly appreciated,

Peace and love,

Joe

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First of all, what computer is it?

- Measure the voltage from the adapter. There should be a small voltage even it it is not plugged into the computer. Some 6V I believe.

- Check the adapter's cable for continuity. Maybe you just have a broken lead. Common problem with those adapters.

- check the magsafe connector for any stuck particles. It might just be a contact problem.

If that doesn't help and with your battery being as it is it might sound like something more serious.

If you feel comfortable with it go check out the logic board for blown fuses.

This is about how far I will be going with my advice, because everything beyond this point requires specialised equipment.

BR

!BATTA!

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Hi Batta,

thank you for the ideas, i have done what you told me and there has not been any proress. I think it's going to be something more serious.

The adapter got so destroyed though, that I threw it away at the end.

I will try to talk to someone that has some experience with the logic board and see if I can get some more advise.

Thank you for your help, see you around!

Joe

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i am in Asia and have experienced a power surge which according to the local Mac Technician the surge fried my Mac Book internals. Before i dispose of the machine... is this fixable?

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Hi Marj,

anything is fixable... the question is: Is it worth the effort.

Pretty much depends on the kind of Mac you're talking about.

I think any macbook after 2011 is definitely worth a try. Older only if you can do it yourself.

BR

!BATTA!

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Fabulous, thanks for that...

I purchased my mac in 2009 so it's old..

Very helpful...

Marjetka...

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I am in Asia too and also experienced power surge, now my Magsafe Charger wont charge.The LED is completely no light.please help.

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Hi,

I had the same issue with my MagSafe for MacBook Pro. There was no charging after a sudden power surge. I had lost all the hopes and was already checking my pockets to buy a new charger when I came across this approach of sitting on the charger for 5-10 mins to warm it up a little and then try charging. It sounded extremely absurd to me but I thought of just giving it a try before I spend my $100. To my surprise it worked and my charger is working fine. I would like to know the reason why this happens with MagSafe if anyone knows. Cheers to the online community for suggesting this solution.

Bhavya

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Mmmm... can you tell me every detail happened ?

What do you mean by warming it up ?

Gently i'm asking you to answer like a bro :')

Peace & have a great day.

Muhammed

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Mike McIntosh will be eternally grateful.
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