OP, really sorry to hear about the insect in your display. I've heard of this happening (rarely), and I've actually experienced this myself with my 2013 iMac. In that case it was also a fruit fly or a gnat, or some such creature. This happened after years of ownership, so I was baffled at first at how the insect could have gotten in to what I thought was a fully laminated and sealed assembly.
Although it is common practice to talk about the screens on the slim iMacs as being bonded together, this is not entirely true. The glass is bonded to a polarizer, which is bonded to the lcd, but the backlight assembly is not bonded together or bonded to the reverse of the lcd in the same way that the lcd is glued to the glass. Rather, the backlight assembly is layered together and taped to the bonded lcd assembly around the edges of the inside of the display assembly. At least on the 2013 model that I had (and this may be true on subsequent models), there were small openings in the tape in the corners and around the display cables. It was therefore possible for a small insect to enter the iMac through the intake vents or a speaker grille, be drawn to the light at the corners of the panel, get into the panel, and then get stuck between the lcd and the backlight assembly. I've also seen a number of complaints on here and elsewhere about dust or particles appearing in the bottom corners of iMac displays, and the gap in the sealing tape might also explain this as well.
The bad news is obviously that you have a fly in your new iMac. If you aren't able to resolve this through Apple or a repair centre, then it might be possible to remove the display and carefully pull back the sealing tape enough so that you can separate the backlight layers to remove the insect. I don't know, I've never tried this.
I think it extremely unlikely that the insect (in whatever life-stage) was present at the time of assembly, and very likely that it got into your display though the scenario described above. I agree with you and some of the other posters here that this is an unacceptable design characteristic. I do not see how one can reasonably police their personal space to be free of gnats.
Although it is common practice to talk about the screens on the slim iMacs as being bonded together, this is not entirely true. The glass is bonded to a polarizer, which is bonded to the lcd, but the backlight assembly is not bonded together or bonded to the reverse of the lcd in the same way that the lcd is glued to the glass. Rather, the backlight assembly is layered together and taped to the bonded lcd assembly around the edges of the inside of the display assembly. At least on the 2013 model that I had (and this may be true on subsequent models), there were small openings in the tape in the corners and around the display cables. It was therefore possible for a small insect to enter the iMac through the intake vents or a speaker grille, be drawn to the light at the corners of the panel, get into the panel, and then get stuck between the lcd and the backlight assembly. I've also seen a number of complaints on here and elsewhere about dust or particles appearing in the bottom corners of iMac displays, and the gap in the sealing tape might also explain this as well.
The bad news is obviously that you have a fly in your new iMac. If you aren't able to resolve this through Apple or a repair centre, then it might be possible to remove the display and carefully pull back the sealing tape enough so that you can separate the backlight layers to remove the insect. I don't know, I've never tried this.
I think it extremely unlikely that the insect (in whatever life-stage) was present at the time of assembly, and very likely that it got into your display though the scenario described above. I agree with you and some of the other posters here that this is an unacceptable design characteristic. I do not see how one can reasonably police their personal space to be free of gnats.
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