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Released in July 2018, the 15" MacBook Pro, model A1990, features a 15.4 inch LED-Backlight display with True Tone technology, TouchID, and up to 6 Core i9 Processor.

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Securing the Touch id connector

Bear with me as I'm an amateur and only doing repairs on my own stuff. I need help with something here..

This is the a cable going from the touch id/power button on a macbook pro 2018 15" A1990. The connector has some sort of "metal net" that used to be attached to the case through something sticky(adhesive/paste?). The "sticky" is worn out and I can not figure out what I should use to secure the connector..

Does it have to be a conductive adhesive/paste or similar? What is that "metal net" used for?

Any help is much appreciated!

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@tedlindstroem - I couldn’t ID the part clearly from your image. I had to go by your description.

I would use the correct tape to replace the tape. Using regular double-sided tape will remove the EMI pathway. You might be able to use a very thin coat of acrylic spray adhesive. Just spraying onto the cleaned off surface (leaving the tape piece on). Just mask off the area so you don’t get the other parts sticky. Thinness counts here!

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For reference here’s the part MacBook Pro 15" Retina (Late 2016-2019) Power Button

The blue plastic protects the adhesive which is already applied to the part so you can stick it down to the frame.

The net is a conductive element within the adhesive for EMI protection. You might be able to reactivate the adhesive using acetone or toluene solvent.

MacBook Pro 15" Retina (Late 2016-2019) Power Button Afbeelding

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MacBook Pro 15" Retina (Late 2016-2019) Power Button

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Thank you for the answer. Atleast now I know what the net is used for. Thanks for the tip on aceton. However the adhesive seems to be a goner.... Do you or anyone else know if I can find a product on the market that should work as a replacement?

----

Just for clarification: The Power Button part does not include the cable and connector that I am struggling with (The power button connector is however connected to this cable.)

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Adding some more info:

Id and name of cable in topic appeara to be 821-00645-A/03 Touch bar power button flex cable.

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@tedlindstroem While your adhesive may be gone, the pad needs only make contact between the cable and the frame of the device to serve it's purpose. (If you were to peel the pad off, you would see copper colored exposed ground contacts on the ribbon cable under it instead of just black as on most of the cable).

You can simply get a piece of good tape (I would recommend a Kapton tape so you know it is electronics safe) and just tape it down over the ribbon cable where that pad is. If you tape it down securely, you will be holding the ribbon cable down in contact with the pad and the pad in contact with the frame. This would serve the purpose of the pad. The adhesive is just there to hold it down in the first place, and is not required for it to do its job.

Also: "Bear with me as I'm an amateur and only doing repairs on my own stuff. I need help with something here.."

We are all amateurs at first. Do not be afraid to ask for help, it is how we all help eachother learn and grow and get better at these things.☺

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@erelectronics - Hold that thought!

EMI needs an electricity conductive adhesive. While some areas can cheat, the TouchID sensor area is not one of them as it needs a low noise area to work effectively.

I would just get the required double stick adhesive tape and just replace this piece. This is what I use https://multimedia.3m.com/mws/media/1197... contact 3M for a sample roll. Express in your dialog you are a product designer or something that they think your not a one roll customer 😊

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@erelectronics Thank you! I did this and it seems to work, but I also ordered some silver-based conductive adhesive that I probably will apply once it arrives.

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@danj Wait, it *needs* an electrically conductive adhesive? I have been taught that the electrical conductivity of the adhesive is required only because a non-conductive adhesive layer may interfere with the conductivity between the pad and the ground. Is that not true? Does direct contact over a surface area have a degraded effect compared to adhesive'd contact over the same surface area?

Do you have a resource of which I can see test results or etc. on such things? Not that I don't believe you, just I would love to learn more about it to avoid giving bad advice in the future if my prior learning was incomplete.

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Electrically conductive differs depending on the voltages involved.

Think of it this way you take a 9volt battery pressing your thumb across the terminals you don't feel anything - Right? Now if you touch the battery to your tongue you get a sensation!

So the dielectric conductivity is different between your finger skin and your tongue to your nerves!

Here we are working in the high frequency realm Electromagnetic interference (EMI) The type of coupling we have here is Radiative.

While different Static Electricity (ESD) uses the same principles of discharging the high voltage while not offering a metal surface which could be a conductor for the powered device you are working on as in the case of an anti-static mat.

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Ted Lindström zal eeuwig dankbaar zijn.
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