Just a moment ago the phone was lying on the table, and now it's staring at you like a swamp eye and hinting that something inside has gone wrong.
The most annoying part is that the first thought is almost always off target. Your hand reaches for your wallet, a figure for a new display is already spinning in your head, when in fact the cause may be hiding somewhere else entirely.
We had exactly this kind of case come in: a green screen on a 13 Pro Max, and the owner was mentally prepared for a display replacement. And that's not a cheap business. But it took our technician three minutes to work out that the matrix wasn't the problem.
How does this work? We take a known-good display, connect it in place of the original — and look. If the picture returns to normal, the screen is to blame: we replace it, mourn the money, but solve the problem. And if the green stays even on a new display, then we need to dig deeper, into the board.
In this case the green stayed. The board turned out to be the culprit, and that's good news in bad packaging: repairing the board is often cheaper than fitting a new display at 18 thousand. Though of course it all depends on the specific damage.
So remember the simple logic: a green screen isn't always about the screen. Before agreeing to a display replacement, it's worth making sure the display is actually to blame. Otherwise you can pay for a new part and then discover that the phone is still giving you that same swampy greeting.