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A bright green line running down your display. The whole screen washes out to white. Flickering colored lines that multiply the longer you look. It's alarming — but if this is happening to your iPhone, here's the reassuring part first: it's almost always a display problem, not a dead phone, and your photos, messages, and data are completely safe. The damage is in the screen, not in your storage or logic board.
Screen repair is the most common fix we do at Cell N Comp Repairs, and these green-line and white-screen cases are among the most frequent issues we see. After thousands of them, we can walk you through exactly what's happening, why, and what it takes to fix it — no guesswork, no scare tactics.
Modern iPhones (iPhone X and every model since) use OLED displays — millions of tiny self-lit pixels arranged in precise columns. That design is why these specific symptoms look the way they do:
The common thread: these are hardware symptoms. No amount of restarting, updating, or factory-resetting fixes a true green line or a failed panel — because the problem is physical, inside the display assembly.
Occasionally, a line is a temporary rendering glitch rather than real damage. Two quick tests tell you which:
If it survives a restart and doesn't appear in a screenshot on another device, you're looking at a display hardware issue — and here's what causes those.
In our experience on the bench, it almost always comes down to one of these — and industry diagnostics back each one up.
Water and moisture are a leading cause. Liquid seeps under the display and corrodes the microscopic circuits and contacts that carry the image signal to the panel. The result can be lines, discoloration, flickering, or a dead display — and it sometimes shows up days or weeks after the phone got wet, as corrosion spreads. (Tip: there's a liquid-contact indicator in the SIM tray slot — if it's pink or red instead of white, the phone has taken liquid.) If your phone took liquid, act fast — here's what to do about iPhone water damage.
This is one people rarely suspect, but we see it regularly. When the bottom of the iPhone runs hot — from a failing battery, a cheap or faulty charger, or a bad charging port drawing too much current — that heat stresses the display's connections. The display connects to the logic board via microscopic flex-cable contacts, and repeated expansion and contraction from heat can loosen or damage those connections, causing lines or flicker. If your screen issue started alongside the phone running unusually hot or charging strangely, the phone may also be having trouble charging. Our guide to why an iPhone won't charge walks through how to tell whether it's the charger, battery, or port that may need attention- not just the screen. Heat is a prime suspect.
The obvious one — but with a twist. A drop can crack the glass or damage the OLED panel and its connector without any visible crack. Green lines that appear right after a drop are a textbook sign: the impact broke a column of pixels or jarred the display connector, even though the front looks fine.
Sitting on your phone, it getting stepped on, or being squeezed hard in a tight pocket or bag can all crush the delicate OLED layers enough to trigger lines or dead sections. Pressure damage is one of the most common causes of the green-line issue and, like a drop, often leaves no external mark.
Pressure can also come from inside — a swollen battery pushing up against the back of the display is a common cause of lines on older phones. If the screen or back of your phone is lifting, see our guide on a swollen battery.
The display connects to the logic board with a short flex cable and connector. If that cable comes loose, gets pinched, or its solder joints weaken (from a drop, heat, or a poorly done prior repair), the image signal is disrupted—causing lines, flicker, white-out, or a screen that cuts in and out. This is also why a screen problem can appear after a low-quality third-party repair that didn't seat the connector properly.
Sometimes there's no drop, no water, no obvious cause at all — the panel simply fails. A weak electrical trace or a faulty factory bond can let a green line appear on its own, often after months of normal use. This was famously widespread on the iPhone X and still shows up across OLED iPhones. It's not something you did wrong — the panel had a latent defect that finally gave out.
Occasionally, the fault isn't the screen at all but the display circuitry on the logic board — a damaged connector port or display driver chip, often after a hard drop, liquid exposure, or a power surge. In these cases, a new screen alone won't fix it; it needs board-level (micro-soldering) work. This is the least common cause, and proper diagnostics are the only way to tell it apart from a simple panel failure—so you don't pay for a screen you didn't need.
Your data is safe. A green line, white screen, or display fault affects only the screen assembly. Your photos, contacts, messages, and everything stored are untouched, even if the screen needs a full replacement.
The fix for most cases is a screen replacement. OLED panels can't be repaired at the pixel level, so when the panel, its connector, or its flex cable is the cause — which is the vast majority of cases — a new display resolves the issue. It's the same repair as a cracked-screen replacement, priced by model. The one exception is the rare logic-board case, which needs micro-soldering rather than a screen swap; our diagnostic identifies that up front.
There's one thing worth acting on quickly: if the cause is heat (a hot phone, a bad battery, or a charging issue) or liquid, the underlying problem can keep doing damage. A new screen fixes the symptom, but the battery, charger, port, or liquid corrosion may need addressing too — otherwise it can happen again. Our diagnostic checks for that so you're solving the real cause, not just the visible one.
If your iPhone screen has developed lines, turned white, or started flickering, bring it to any of our three Chicago-area stores. Our diagnostic is free: we'll confirm whether it's the panel, the connector, liquid, heat, or the board, tell you exactly what it needs, and quote it upfront — no diagnostic fee. Most iPhone screen replacements are same-day, backed by our 30-day warranty.
Serving Chicago and the north suburbs, including Evanston, Lincolnwood, Skokie, Niles, and Morton Grove.
