Macbook Pro - Not charging. Not Turning On.

[Sak30]

My Macbook Pro (mid 2012) unexpectedly shutdown on its own last night. Everything seemed to work fine all along until then. But now cant charge my machine. Cant even switch it on.

Initially i thought my battery may be too low. So rushed to get my laptop charger. But for some reason it refused to charge my Macbook. Can see a just a dim green light on the head of the charger . But no success in charging the machine.

I have tried resetting the SMC without any luck.

Another strange observation, there appears to be a continuous low level noise from the base of the laptop (not sure its the fan, hard disk or any other circuit board). The laptop has been disconnected from the charger last 12 hours. But still can hear this static noise ( similar to low level buzzing or an old vinyl record stuck). It is hardly audible but very much present when I hold it very close to my ear.. I find this noise very unusual. Why should this happen even with no charger connected. By now whatever little battery I had charged before the laptop crashed should have discharged.

There has been no kind of liquid or external damage as far as I remember.

Kindly suggest possible solutions.

Thanks in advance.

 

[Analias]

The only solution is to take it to a 3rd party tech and get it repaired. Sooner rather than later, as draining the battery too low can cause the fuse to blow, and if you can hear a buzzing I guarantee it's draining the battery. There is a problem most likely in the charging circuit, probably the isl6259. I'd recommend removing the back in the mean time and disconnecting the battery. Feel around for any hot components before you do though.

 

[Audit13]

Is it possible the MacBook was exposed to liquids?

 

[Analias]

Is it possible the MacBook was exposed to liquids?

They don't need to be exposed to liquid, quite often their chips just spontaneously die. Besides, humidity is enough to cause corrosion after 8 years of use, especially when hair and fluff and dust lock it in. I don't think it matters anyway, no amount of smc and nvram resets will fix it, and unless OP is skilled with electronic diagnosis and repair it's going to have to go to a 3rd party repairer.

 

[Audit13]

They don't need to be exposed to liquid, quite often their chips just spontaneously die. Besides, humidity is enough to cause corrosion after 8 years of use, especially when hair and fluff and dust lock it in. I don't think it matters anyway, no amount of smc and nvram resets will fix it, and unless OP is skilled with electronic diagnosis and repair it's going to have to go to a 3rd party repairer.

Yes, chips can spontaneously die, but the effects of liquid exposure can appear quickly or slowly over time. You never really know until all parts are at least visually inspected. I have personally revived several MacBook Air logic boards by visual inspection and a thorough cleansing with pure isopropyl alcohol.

Humid air is basically moist air. Bringing a cold metal object into a hot and humid environment will cause condensation on the metal parts; hence, liquid exposure.

Corrosion can be detected through a visual inspection and cleansing with pure isopropyl alcohol can sometimes fix the problem. No expertise is required other than having patience and the right tools to dissassemble the unit.

I've never seen hair or dusk cause corrosion.

 

[Fishrrman]

Isn't there a small auxiliary "DC-in" board that attaches to the motherboard to control charging? If so, that could be the point of failure.

I'd check over at ifixit.com ...

 

[Analias]

Isn't there a small auxiliary "DC-in" board that attaches to the motherboard to control charging? If so, that could be the point of failure.

I'd check over at ifixit.com ...

There is, but I've rarely seen a faulty one on a macbook pro, and it doesn't control charging in any way. The dc-in board on the air is another story as it contains components critical to the one-wire circuit.

 

[MacInTO]

You could also have a bad adapter. If you have another, try that. Or look for metal particles stuck to the charger port. That could cause a poor connection.

You can also try removing the battery, attach the charger and then see if it starts up. It should work without a batter. While you're at it, vacuum the dust out of there. I've had machines have problems because of too much dust inside.

If none of these work, with a good adapter, no charging is often a bad DC-in board. I've seen a few of these fail before. If this part didn't exist, your motherboard could get fried instead. Cheap part but a pain to replace because the motherboard needs to be removed.