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The April 2014 update of Apple's 13" MacBook Air features refreshed dual-core i5 and i7 processors, plus slightly increased battery performance.

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How to identify missing resistor near ufi chip?

After replacing the ufi chip on two macbook air a1466 (emc 2632 and 2178), I see that I have missing resistors that I can't find on the schematics (r6115 and r6128 near u6100).

My problème is that I can't figure out the values of that resistor! How can I do since I don't have a working board to compare?

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Выбранное решение

Hopefully this is the correct board (820-3437)

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Please ID the locations you think had been populated from these photos.

Keep in mind some Schematics come off the back of the truck are not complete! Also Apple might have altered the design not needing the component! As an example Apple doesn’t populate the JTAG connector as well some debug components which are not needed in production.

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@danj yes it the correct board , the resistor is near the u6100 (ufi chip)

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@nacimux - First Apple calls the 6100 chip UEFI not UFI.

I've posted a clearer boardview drawing based on the board number. I've also noted both the R6115 and R6116 resistors. Both resistors are the same value so if the issue is the value and not the placement, and the schematic is not helping you, I would de-solder the R6116 and measure it.

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What do you mean by “I can’t figure out the values?” You have posted the values in your image.

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@imicrosoldering But how much ohm? 15? 20?...

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@nacimux - The value of the resistor by the schematic is 15 Ohms, 5% tolerance, 1/20 watt in a MF201 case.

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@dan 15 ohms! This is what I was missing, what about the size? Is it 0201?

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Nacim будет вечно благодарен.
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