2.3GHz, 2.6GHz, or 2.7GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.7GHz) with 6MB shared L3 cache.

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Need help replacing resistor or capacitors on logic board

I have a 2.7Ghz i7 with 16GB ram model, i bought it on ebay and it was firmware locked. i knew this before i bought it and did research before hand. when i thought i could repair it i bought it.

Upon replacing the EFI firmware chip i accidentally lost a resistor i believe, and it fell into an alternate dimension just like my socks do in the dryer.

I need help finding the value of the component i lost so i may replace it. I know sometimes computers run without some components, but when i turned this one on it would not post anymore, but the fans did spin up and the heatsink got hot quickly. So i immediately turned it off. I suppose i could have the wrong EFI chip, but since i accidentally knocked off another component i think i first must assume that is the issue.

Here are links to some pictures i took, i know not everyone does logicboard repair but if anyone can help me find this component id really appreciate it. Otherwise il have to replace the board and that costs like 700 bucks :/

http://postimg.org/image/ncm2v5iud/ This is the location of the missing component. Excuse my spelling error on this image. Lol

http://postimg.org/image/z8pan3jax/ This is the EFI chip

http://postimg.org/image/pqknamk1j/ This is a resistor, i believe.. still in circuit. I measured it but since its in circuit it probably doesnt matter that i measured it.

Answer this question I have this problem too

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I also have a schematic of this board, however, i havent had any luck finding exactly what im looking for. :/ if anyone knows how to read one of these without looking through every page and deciding what it means i could send it to you via email. I really just want to fix this thing.


Make shure you don't boot into the hard drive that was in it before you replaced the efi. Is the efi chip for a1398? Are u sure its not upside down?


John, you didn't do well in spelling class, right? When the word turns red or blue, it is not embarrassed, you are. Let's make some semblance of effort so you don't sound like a hick. Your answers are excellent but your vernacular detracts from their veracity.


Yeah I hear they dock your pay here if your answers have grammatical errors.


Check the bottom of your pay check, you'll see itemized deductions for grammar, spelling and profanity. If there are to many you don't even get a paycheck and are told that all this effort is pro-bono.


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The resistor is R5023 SPI_SMC_CLK its 33ohm resistor in 0402 package make shure to check R5021-R5024 (SMC12 SPI SUPPORT) for their correct measurement check the schematic.

Unless Bios chips are correctly flashed it won't work right you need right spi rom just so you know.

If this helps click the answered button.

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Yes I was aware of the need for it to be programmed correctly as apple uses different chips for a number of their laptops. The guy I bought it from sells them and claims to have flashed it properly before hand. Hopefully he is telling the truth... Because I've since lost the original chip. I should have just bought the SO8clip and a raspberry pie board and done it the build it yourself way so I'd have a back up of the original chip, but just buying a preprogrammed chip was cheaper... I might end up paying for being cheap. Ironic..

So it is a 33ohm resistor that I need to buy, in a 0402 package. Just to verify. I will look on my schematic also. I won't do anything until I'm positive.


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Kris HM will be eternally grateful.
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