Burned SMT on MacBook Pro 13"logic board 820-2936-B? How could it be?

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MacBook Pro 13" Unibody Early 2011

2011년 상반기 모델, A1278 / 2.3 GHz i5 또는 2.7 GHz i7 프로세서.

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Ant Bee @antbee

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Burned SMT on MacBook Pro 13"logic board 820-2936-B? How could it be?

Hi, everyone. I have a macbook pro A1278 i5 2.3GHz for sometime, it won't work on a sudden yesterday . So, I take out the logic board and have a look, it seem that one of the SMT burned,(see in the pictures , get a burn black marks.)

I have no idea what is going on. If I put on the charger, the charger give a green light, no fan spin, and the burned SMT get real hot. I assume the SMT should be replaced, but do not know the specification. The words on the SMT is KO 336 16k 117, it should be the brand Kemet, I do a lot of google search, but no luck , nothing specific is found.

The logic board is 820-2936-B. Does anyone have any idea? and what cause it to be like this? any fix?

so after the changing smt, the mac back to life. Thank you for the information.

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Dan @danj

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Sadly your CPU’s power logic is messed up. The component you’ve pointed to is a capacitor C7530 as you can see here in the board view:

And if we look for it within the schematics we can see C7530 is a 33UF 20% 16V POLY-TANT CASE: D2E-SM and is part of the PHASE-2 power section.

At this point you could have a deeper problem as well, do you have the skills to do micro-soldering? It might be best to find someone with deeper skills to fix your logic board.

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Thank you for your reply, I really need it. I can do the SMT replacement with a heat gun , and I am ok with the tool. I think I will replace the burned SMT and see what we get, because I have no idea what else can be done . Hope it would be ok again, I will keep update the condition of the MBP once I try something.

However, I also what to ask if any SMT with 330UF and up to 16V is ok for the replacement? Because I only find SMT 7343 (D type), they say it is also 330uf and up to 16v.

Ant Bee 의 2021년 10월 2일

@Ant Bee - Here's the needed part: 33UF,16V KEMET 16 VDC B Case 20 % Tantalum Capacitor

Dan 의 2021년 10월 3일

Thank you, let try if it would work. I will update the situation once I get the part and make the replacement.

Ant Bee 의 2021년 10월 4일

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Thank you for your reply, I really need it. I can do the SMT replacement with a heat gun , and I am ok with the tool. I think I will replace the burned SMT and see what we get, because I have no idea what else can be done . Hope it would be ok again, I will keep update the condition of the MBP once I try something.

However, I also what to ask if any SMT with 330UF and up to 16V is ok for the replacement? Because I only find SMT 7343 (D type), they say it is also 330uf and up to 16v. — Ant Bee
@Ant Bee - Here's the needed part: 33UF,16V KEMET 16 VDC B Case 20 % Tantalum Capacitor — Dan
Thank you, let try if it would work. I will update the situation once I get the part and make the replacement. — Ant Bee

MacBook Pro 13" Unibody Early 2011

Burned SMT on MacBook Pro 13"logic board 820-2936-B? How could it be?

Update (10/15/2021)

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