Identify Blown Capacitor, What does it do? Where to buy?

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MacBook Air 13" Mid 2013

듀얼 마이크와 802.11ac Wi-Fi 연결 기능을 갖춘 더 큰 Apple MacBook Air 노트북 입니다.

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josvanderplas @josvanderplas

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게시일: 2017년 4월 15일

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Identify Blown Capacitor, What does it do? Where to buy?

See picture attached. It seems to be a blown transistor (as reece pointed out it is actually a capacitor) next to the Airport card. The machine works fine, but I feel the urge to replace it.

What does it do and where do I buy a new one? The soldering job seems pretty straight forward.

The identification seems to be "NEL AV7" or AY7.

The schematics for this board is here.

On google image search the transistor is identified as "NEC AV7" instead of "NEL".

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Reece @reecee

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Below is Apple's reference followed by the specification of the tantalum capacitor (assuming board number is 820-3437). You should be able to buy these from places like Farnell, Digikey or Mouser, depending on where you are located.

Would definitely replace it before it causes a problem.

C7582

62UF-0.023OHM

11V

TANT-POLY

20%

CASE-B2S-1

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Ah, so it's a capacitor not a transistor. Do you by any chance know in what circuit this is located? What is it's functionality?

josvanderplas 의 2017년 4월 15일

It stabilises PPBUS_S5_HS_OTHER_ISNS, which is used for input on Q7520, Q7560 and U7501. The fact that it is blown could indicate a voltage spike on this line, it could have been affected by a lot of heat or just be bad.

Reece 의 2017년 4월 15일

I don't seem to find a replacement that has the right capacitance. Typical Apple to use such tailored components...?

The only source I could find was Aliexpress, but then I have to buy 50 pieces. Oh dear. Might be able to find a donor board for cheaper.

I suppose a 68uF would work, but there are none that are of the right size and/or voltage.

Any tips?

josvanderplas 의 2017년 4월 15일

I'm not sure to be honest with you, sometimes it is ok, but sometimes it can cause an issue. I would play it safe, order a donor board from Aliexpress for under 20$ and transfer it across.

Reece 의 2017년 4월 15일

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Ah, so it's a capacitor not a transistor. Do you by any chance know in what circuit this is located? What is it's functionality? — josvanderplas
It stabilises PPBUS_S5_HS_OTHER_ISNS, which is used for input on Q7520, Q7560 and U7501. The fact that it is blown could indicate a voltage spike on this line, it could have been affected by a lot of heat or just be bad. — Reece
I don't seem to find a replacement that has the right capacitance. Typical Apple to use such tailored components...?

The only source I could find was Aliexpress, but then I have to buy 50 pieces. Oh dear. Might be able to find a donor board for cheaper.

I suppose a 68uF would work, but there are none that are of the right size and/or voltage.

Any tips? — josvanderplas
I'm not sure to be honest with you, sometimes it is ok, but sometimes it can cause an issue. I would play it safe, order a donor board from Aliexpress for under 20$ and transfer it across. — Reece

AJ Calixtro @ajcalixtro 평판: 1 · Answer 1 · 2022-03-15T22:17:45-07:00

AJ Calixtro @ajcalixtro

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I have blown capacitor also but it was NEX AV7, will it be okay to replace it with NEE AV7 or NEL AV7? I discovered that the 3rd letter indicates a year, will ot matter when it cpmes on replacing one of this? I only have one blown cap btw

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MacBook Air 13" Mid 2013

Identify Blown Capacitor, What does it do? Where to buy?

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