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La mise à jour tant attendue du célèbre Mac Mini. Processeurs disponibles : Intel Core i3 quad-core à 3,6 Ghz, Intel Core i5 hexa-core à 3,0 Ghz et Intel Core i7 hexa-core à 3,2 Ghz.

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mac mini 2018 - help identifying small SMD component

hello,

I was replacing the RAM and my screwdriver slipped off the fan screw and I managed to destroy a small SMD resistor/capacitor on the board. It is close to power socket I assume it's "power related circuit" anyway the mac won't start anymore :(.

I need your help to identify the damaged component (circled in the image). Many thanks.

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@george19895 that is reference designator R4711 which is a 3.0K 1/20W 5% resistor in a 0201 package. Way better answers and explanations than what I left.

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Well. It was an unfortunate component to take out, but if all you did was accidentally knock off that one little guy, it could be far worse. But we may need a better picture to know the extent of the damage.

The Important Thing

This is a 3K Ohm resistor in a 0201 package. It's likely you can harvest one from something else if you have circuit boards lying around where you can find values for components. Or you can buy some new ones from any number of online vendors for electronic components (Digikey, Mouser, etc...).

A Whole Lot of Extraneous Info

As @danj suspected, this is part of the T2 circuitry. Specifically it's a resistor that tells the SoC ROM important data about the board. It's referred to in the schematic as a "board ID resistor." I am less familiar with theses on Macs than I am on iPhones, but typically different resistor values or placements notate different boards when the same set of components is used on multiple configs. On the iPhone, it's how the system identifies an almost identical board as an iPhone 11 Pro Max, rather than an 11 Pro. This same SoC ROM is used through the entire life of T2. Even the iMac Pro, where T2 first appeared.

The SoC ROM, in plain speak, is a read only memory chip. It stores baseline firmware; data that its accompanying chip will need to function. The SoC, or System on a Chip, is T2 in this case. ROMs are a common part of computer circuits. There are plenty of various ones for different systems: Thunderbolt, the Secure Enclave, WiFi, and others. ROM chips are typically programmed during the manufacturing process. But I suspect it needs the input coming through the line with the missing component to function.

T2 turning on is a pretty early step in the boot process. So without it, your machine can't get to the point where everything actually turns on. T2 doesn't know what to do without the missing input from this chip so anything it handles is dead in the water. You won't even get trackpad click without T2, hence why it seems so dead.

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Thanks for your detailed answer, it now explains why I don't see the power led on or hear the chimney sound. Unfortunately I don't have a microscope and I took the photo with my phone. I hope the component can be solder back on - it looks pretty tiny. I plan to take it to a repair shop early next week (unfortunately all shops are closed Fri - Tue this week). I'm frustrated because it was a brand new mac - I wanted to upgrade the RAM as I did before with another machine :(.

I was not sure if the repair shops have access to schematics and this is why I asked here first about the component value. I have hopes that with the right toolset they can fix it.

par

My mac is fixed, component was replaced and all is working fine. thanks a lot to everyone.

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Réponse la plus utile

@george19895 that is reference designator R4711 which is a 3.0K 1/20W 5% resistor in a 0201 package.

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Thanks a lot, you literally saved my life, it was a brand new mac. I was trying to upgrade the memory and I wasn't careful.

I'm somehow sure that R4710 was not on my board, maybe it's another revision. I'll need to find a shop to solder it now and compare the missing part with another board. Much appreciated your help.

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@oldturkey03 - I should have known you found them 👍🏻👍🏻👍🏻

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@oldturkey03 - I really don’t get you! You give the answer and then throw it away so the next person looses the knowledge offered!

Leave your answer alone! All three offered information based on what we know and have access to.

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Here’s a better image on what it should look like

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Sadly, I don’t know of any way to find the component as I have yet to see schematics and board views of the Intel MacMini’s. Someone who has a junker logic board might be able to see if they can take it out and measure it.

If that fails I think your only option is locating a junker to acquire the component.

FYI - I suspecting this is part of the T2 logic which is also very close.

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Thanks a lot for your reply. If I can find another board can I measure the component "in place" or should be taken off for the measurement ?

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@george19895 - it would need to be removed and given the size difficult!

Which if you get the junker I would just install it. I wouldn’t try taking it off a good board as the risk is two messed up boards 😩

par

Looking closely to your picture I believe this could very well be some 01005 SMD resistor, what do you think ?

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@george19895 - Likely, there are tantalum caps in this size as well.

The iFixIt picture is a bit fuzzy so I can’t tell. Your logic board may have lost its solder pads as well here. One really needs a microscope to see things at this scale.

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George sera éternellement reconnaissant.
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