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Does this sound like Magsafe 2 dc in board failure?

My Macbook Pro Retina 15" early 2013, A1398 has no water damage and not been dropped. But the adapter had some non springy connector pins on the magsafe 2 head, with blackened outer two pins on the dc in connector. (I think outer two are ground, not power). Cleaned them up, found no metal debris in connector, magsafe head still hot and intermittent green and orange leds. Coconut battery showed good condition battery.

Jiggled magsafe 2 connector, smelt some burning, and leds now both out. Battery not charging but ran from power adapter if SMC reset. Laptop then worked as normal until battery got to below 5% or so, then nothing would power up computer.

Have got second spare working magsafe charger to check, but nothing can boot it up.

Does this sound like only damaged magsafe dc in board, or logic board probs? The laptop was working fine before it wouldn't boot up, but of course not charging battery.

Does the dc in board have any fuses or protection circuitry? Looking at photos of it, there seem to be some components on the small PCB, and someone mentioned a burnt out P7 (?) transistor on the board.

Any ideas?

Thanks

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First lets review the MagSafe adapter to see if it was the source of the problems you're now facing: Apple Portables: Troubleshooting MagSafe adapters Using this Apple T/N do you see any damage to the computers connector contact face as well as the pins in the cord end?

One of the problems I've had in the past a lot of is fake chargers damaging systems. Here's a bit more: Counterfeit MacBook-Charger Teardown & Lacking safety features, cheap MacBook chargers create big sparks.

As for fuses the logic board has a few but I don't think thats going to help you. I'm suspecting the charging logic on the logic board has issues. You'll need to find someone with the needed diagnostic skills and tools to fix your logic board.

The DC In-Board is mostly passive as you can see here: MacBook Pro 15" Retina (Mid 2012-Early 2013) MagSafe 2 DC-In Board It mostly directs the power to the logic board. The one wire comm link between the charger & system does have some logic but it data not power. What can happen is a short in the MagSafe connector shorts out the power lines to the center pin (comm) which can burn these parts. Here's the IFIXIT guide: MacBook Pro 15" Retina Display Early 2013 MagSafe DC-In Board Replacement

MacBook Pro 15" Retina (Mid 2012-Early 2013) MagSafe 2 DC-In Board 이미지

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MacBook Pro 15" Retina (Mid 2012-Early 2013) MagSafe 2 DC-In Board

$24.99

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I opened up the case and located the Magsafe 2 connector. The transistor (?) P7 on the PCB has fried. The other smd components lok ok. Not sure what P7 does.

I can still run the laptop as normal using the power adapter, but battery not charging, just shows 2%.

Just another thing, the charger is the original 85W Apple one, not a copy.

Thats not good something shorted! So yes you'll need to replace the DC-In Board and you likely need to replace your MagSafe charger as well. Is the cord damaged in any way? If you see any wrinkles in the outer covering the cord has a short.

charger and cables look ok from outside, but havent opened it up.

i ran the apple hardware tests, the quick version and the extended version (2 hrs!) and both found no problems.

coconut battery shows about 100mA charge current, so this trickle charge not enough to charge battery but seems to allow boot up and then laptop runs on charger only.

i have genius bar appointment, will report back.

Ok so the news is that it was the magsafe 2 dc in board which had failed, and luckily not the logic board. The Apple Hardware test I did found no problems.

Very Lucky! If the charger is in good shape we can surmise the fault was a static discharge. Make sure your case is static free and mind the fingers around the connector so you don't zap it if your charged up walking across the floor.

Time for a humidifier and a bottle of soapy water to spray your computer bag (letting it dry first).

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