Concern about display adhesive bond

Question

iMac Intel 27" Retina 5K Display (Mid 2017)

Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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Simos Kondylakis @simos805

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Concern about display adhesive bond

Hi, I have an iMac 5K 2017 and I wanted to clean the inside and replace the thermal paste to maximize thermal performance.

My concern is about the display adhesive. Most people who have done a repair like that don’t have problems based on the reviews of the adhesive parts on iFixit (although we don’t know after how many hours/days/months they wrote the reviews), but some users claim that their displays come off and break down due t poor adhesive bond.

For some that happened after 1-2 days of installation and for others after 6+ months.

You can see even this guy on the video below having that problem, ended up with a broken display.

https://youtu.be/Sntb7FyFlnw

Seeing all those comments and that video, I’m very scared about doing that repair, because then I will be anxious all the time if the display will break down the next minute…

What’s your opinion about all that?

ifixit says that you have to completely remove the old adhesive and clean well the surfaces with alcohol so the new adhesive will be secured well, but again, is there a way to be sure my display will be secured and won’t come off randomly, or the reality is that you will never be sure with those types of adhesive and you have to accept that possibility of the display to break down randomly??

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Dan @danj İtibar: 478,9b Self employed contract worker 35 329 970 · Answer 1 · 2020-11-17T20:14:30-07:00

Dan @danj

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I’ve done well over 30 systems now and I can tell you the issues come down to two!

Bad cleaning!

People don’t clean the surfaces properly and/or use the wrong solvents so a film is left. You want to make sure the surfaces are fully clean with none of the old adhesive left. I use a two solvent solution I use goof off to clean the old stuff off where needed and then I use reagent grade isopropyl alcohol 85% or better to pull off the goof off and any other oils using lint free lab wipes.

Heat and pressure!

You need to use a heat gun warm the case and glass surfaces to soften the adhesive so it makes better adhesion as well as apply pressure. You don’t need high heat, you want it warm to your touch and use a rubber roller to press the glass down along the edge (don’t over do the pressure as you can crack/chip the glass), This is what Apple uses! As you can see here: