Phone screen problems Spots, lines, tints, burn-in, bleed and dead touch areas on a phone screen — what each one means, whether it can be fixed, and what a display replacement costs.
Run the colour test first Step through the colours full screen. A fault that stays put on every colour is in the panel; one that changes or disappears is a signal, setting or driver problem.
On white dark spots, pressure marks, lines
On black bright dots, backlight bleed, glow
On red, green, blue dead or stuck pixels, colour lines
Find your fault Why is there a purple line on my iPhone Purple vertical lines on an iPhone screen are almost always the display itself: the flex connector between the panel and the board has lifted (often after a drop or a swollen battery pushing from behind), or a row or column driver on the panel has failed. Depends — see test Bright spot on iPhone screen A white spot on an iPhone screen that glows on black is one of two things. Depends — see test Galaxy S8 screen lines A line on a Galaxy S8 screen is almost always the display itself: the flex connector between the panel and the board has lifted (often after a drop or a swollen battery pushing from behind), or a row or column driver on the panel has failed. Depends — see test Note 9 screen color issue A phone screen that has turned off-colour — the whole screen, not a patch — is one of four things, in order of likelihood: a colour setting (Eye comfort / Night Light / a colour filter under Accessibility / a wallpaper-based theme), an OLED panel ageing or damaged so its colour balance has drifted (a cast that is worse at low brightness), a lifted display connector after a drop, or liquid in the display. Fixable Yellow spot on my phone screen A yellow spot on a phone screen is heat or adhesive: on an OLED the organic layer has aged where the phone runs hottest (the bottom, near the charging port and the processor), and on an LCD the optical adhesive between glass and panel has yellowed or separated. Depends — see test Phone screen turning green A phone screen that has turned green — the whole screen, not a patch — is one of four things, in order of likelihood: a colour setting (Eye comfort / Night Light / a colour filter under Accessibility / a wallpaper-based theme), an OLED panel ageing or damaged so its colour balance has drifted (a green cast at low brightness is the classic AMOLED sign), a lifted display connector after a drop, or liquid in the display. Fixable Phone display problem Phone screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Grainy screen protector A grainy, sparkly or slightly rainbow look after fitting a screen protector is the protector, not the screen: matte protectors scatter light and make white look like fine sand, and a cheap glass protector with a thick adhesive layer adds a faint moiré against the pixel grid. Fixable S8 black dot on screen A black dot on a phone screen that shows on white and vanishes on black is inside the panel: a cluster of dead pixels (a sharp-edged tiny square), a pressure mark (soft-edged, where something pressed the panel), or dirt under the glass (moves if you press gently, on tablets and monitors only). Depends — see test Why is my phone screen green? A green tint over the whole phone screen — or a screen that goes fully green — has two very different causes. Depends — see test Blue spot on phone screen A blue spot on a phone screen is OLED damage: the blue sub-pixels in that area have been knocked out of balance by pressure or a knock, so the area renders blue where it should be white. Depends — see test Grey spot on phone screen A grey spot on a phone screen is a dimmed patch: pixels that still work but weakly. Depends — see test How to fix broken screen protector A broken screen protector — cracked, chipped, lifting at a corner — is doing its job, and there is no way to repair it: the tempered glass is already shattered along its stress lines. Fixable Permanent smudge on phone screen A permanent smudge or stain on a phone screen that no cloth removes is one of three things: the oleophobic coating has worn through in patches (looks like a greasy print that will not wipe off, usually where the thumb rests), moisture or oil has crept under the screen protector, or the OLED has a faint burn-in ghost that reads as a smear. Depends — see test Spot on iPhone screen A black spot on an iPhone screen that shows on white and vanishes on black is inside the panel: a cluster of dead pixels (a sharp-edged tiny square), a pressure mark (soft-edged, where something pressed the panel), or dirt under the glass (moves if you press gently, on tablets and monitors only). Depends — see test Dots on phone screen Small coloured spots on a phone screen come from three places. Depends — see test Green smudge on phone screen Green smudges on a phone screen are single green sub-pixels stuck on, or a small area where pressure has damaged the OLED layer. Depends — see test IPhone XR screen issues iPhone XR screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Samsung S9 screen problems Galaxy S9 screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Moisture in iPhone screen Moisture inside an iPhone screen shows as a dark cloud on white, a fog under the glass, or a bright halo at one edge on black, and it shifts over hours. Depends — see test Rainbow effect screen protector A rainbow or oil-slick effect on a screen protector is Newton's rings: the protector's adhesive is not fully bonded to the glass, or a wet-applied protector has liquid trapped, so light interferes between the two surfaces. Fixable Note 9 screen discoloration Discolouration on a phone screen means the colour is wrong in one area, not everywhere: a yellow or brown patch, a blue or purple edge, a dim corner, a pink blotch. Depends — see test Why is my phone screen blue tint A phone screen that has turned blue — the whole screen, not a patch — is one of four things, in order of likelihood: a colour setting (Eye comfort / Night Light / a colour filter under Accessibility / a wallpaper-based theme), an OLED panel ageing or damaged so its colour balance has drifted (a cast that is worse at low brightness), a lifted display connector after a drop, or liquid in the display. Fixable Samsung display issue Samsung screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Discoloration of mobile screen Discolouration on a mobile screen means the colour is wrong in one area, not everywhere: a yellow or brown patch, a blue or purple edge, a dim corner, a pink blotch. Depends — see test Phone screen problems Phone screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Redmi Note 8 screen problem Redmi Note 8 screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test White patch on iPhone screen A white patch on an iPhone screen that glows on black is one of two things. Depends — see test Black spot on mobile screen A black spot, patch or blot on a mobile screen that is there on every colour is damage inside the display: crushed pixels from pressure, or an internal crack in the panel with the glass intact. Not fixable — new panel Black dot on iPhone X screen A black dot on an iPhone screen that shows on white and vanishes on black is inside the panel: a cluster of dead pixels (a sharp-edged tiny square), a pressure mark (soft-edged, where something pressed the panel), or dirt under the glass (moves if you press gently, on tablets and monitors only). Depends — see test Black dot on mobile screen A black dot on a mobile screen that shows on white and vanishes on black is inside the panel: a cluster of dead pixels (a sharp-edged tiny square), a pressure mark (soft-edged, where something pressed the panel), or dirt under the glass (moves if you press gently, on tablets and monitors only). Depends — see test Galaxy S8 screen issues Galaxy S8 screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Purple patch on phone screen A purple patch on a phone screen is OLED damage: pressure or a knock has upset the red and blue sub-pixels in that area. Depends — see test Rainbow spot on phone screen A rainbow spot on a phone screen is Newton's rings: two flat surfaces almost touching, usually a screen protector or the cover glass pressed onto the panel, or moisture between them. Depends — see test Phone screen bleeding "Screen bleeding" on a phone means one of two things. Not fixable — new panel Mobile display problem Mobile screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Black shadow on iPhone screen A dark shadow or shaded area on an iPhone screen — larger than a spot, with soft edges — is one of three things: a pressure bruise where the panel was squeezed (a bag, a thumb, a case), a backlight fault (LCD: a failing LED string or a slipped diffuser sheet leaves a dim band), or burn-in of a dark app area (OLED). Depends — see test Green horizontal lines on phone screen Green horizontal lines on a phone screen are almost always the display itself: the flex connector between the panel and the board has lifted (often after a drop or a swollen battery pushing from behind), or a row or column driver on the panel has failed. Depends — see test IPhone X screen issues iPhone X screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test My phone screen is turning blue A phone screen that has turned blue — the whole screen, not a patch — is one of four things, in order of likelihood: a colour setting (Eye comfort / Night Light / a colour filter under Accessibility / a wallpaper-based theme), an OLED panel ageing or damaged so its colour balance has drifted (a cast that is worse at low brightness), a lifted display connector after a drop, or liquid in the display. Fixable Note 8 screen problem Galaxy Note 8 screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Note 9 screen problem Galaxy Note 9 screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Rainbow effect on phone screen A rainbow effect on a phone screen — oil-slick colours that shift when you tilt or press — is interference between two surfaces almost touching: a screen protector not fully bonded, moisture between glass and panel, or (on a laptop) the polariser film starting to lift. Fixable Small black spot on phone screen A black spot on a phone screen that shows on white and vanishes on black is inside the panel: a cluster of dead pixels (a sharp-edged tiny square), a pressure mark (soft-edged, where something pressed the panel), or dirt under the glass (moves if you press gently, on tablets and monitors only). Depends — see test Water in mobile screen Moisture inside a mobile screen shows as a dark cloud on white, a fog under the glass, or a bright halo at one edge on black, and it shifts over hours. Depends — see test Mobile screen problem Mobile screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test Black dot on phone screen A single small black dot on a phone screen is one of three things: a dead pixel (a sharp black point on every colour), a speck of dust under the screen protector or the glass (raised, and it moves with the protector), or the start of pressure damage (soft-edged, grows over time). Depends — see test Why my phone is glitching A phone that is "glitching" — the screen jumps, ghost touches open apps, the image tears, colours flash — is usually the touch layer or software, not the display panel. Fixable Black mark on phone screen A black mark on a phone screen that shows on white and vanishes on black is inside the panel: a cluster of dead pixels (a sharp-edged tiny square), a pressure mark (soft-edged, where something pressed the panel), or dirt under the glass (moves if you press gently, on tablets and monitors only). Depends — see test Purple dot on phone screen A purple dot on a phone screen is OLED damage: pressure or a knock has upset the red and blue sub-pixels in that area. Depends — see test Stain on phone screen A permanent smudge or stain on a phone screen that no cloth removes is one of three things: the oleophobic coating has worn through in patches (looks like a greasy print that will not wipe off, usually where the thumb rests), moisture or oil has crept under the screen protector, or the OLED has a faint burn-in ghost that reads as a smear. Depends — see test Touch screen test A touch screen test checks whether every part of the screen registers your finger. Fixable IPhone screen bleeding "Screen bleeding" on an iPhone means one of two things. Not fixable — new panel IPad screen problem IPad screen problems fall into a short list, and each one has its own page: a black or white spot (pixels, pressure, backlight), a line (panel connector, cable, or graphics), a colour cast (settings or panel ageing), flicker (settings, cable, or connector), burn-in ghosts (OLED ageing), a blurry image (settings), half the screen blank (panel driver), or touch that stops responding in one area (digitiser). Depends — see test OLED and LCD fail in different ways Knowing which panel your phone has explains most of what you are seeing. OLED screens — most modern flagships and many mid-range phones — light each pixel individually. They fail with burn-in (a faint permanent ghost of something long displayed), green or pink lines , and colour shifts. They do not get backlight bleed, because they have no backlight.LCD screens have a backlight behind the whole panel. They fail with backlight bleed , bright or dark blotches , and yellow patches where the diffuser or adhesive has degraded, usually from heat.
The yellow patch, and why it is so common A yellow or amber patch, usually near an edge or corner, is one of the most searched phone screen faults and it is almost always the same thing: the adhesive or diffuser layer behind an LCD panel has discoloured, generally through heat. A phone left on a car dashboard, charged under a pillow, or gamed on hard while charging will all do it. It is permanent, it tends to spread slowly, and no software or setting affects it. Some makers treat it as a manufacturing defect within warranty; most treat heat exposure as user damage.
Lines on a phone screen A green, pink or white line running down an OLED phone screen is the classic display failure. It usually appears after a drop, after moisture, or sometimes on its own as the panel ages. It is a break in the panel’s driver connection — no software fixes it, it typically widens over time, and the repair is a display replacement.
Burn-in and how to check for it Burn-in is a permanent faint ghost of a static image — a keyboard, a navigation bar, a status bar — left after months of the same pixels showing the same thing. It only affects OLED. To check, display a solid mid-grey screen at high brightness in a dark room: burn-in shows as darker patches shaped like whatever caused it. There is no repair. Lower brightness, hidden bars and dark mode slow it but do not reverse it.
When touch stops working but the picture is fine A dead strip or patch where touch does not register, while the image is perfect, means the digitiser layer has failed rather than the display. On most phones the digitiser is bonded to the display and both are replaced together, so the repair is the same. Before paying, rule out a screen protector with trapped debris or a cracked protector — both block touch convincingly.
What a repair costs United States: $80–200 for a display on most Android phones; $200–380 at Apple for an iPhone screen out of warranty ($29–99 with AppleCare+)
India: ₹2,000–6,000 for a display on budget and mid-range Android phones at an independent shop, ₹6,000–20,000 for flagship OLED screens at the brand service centre; iPhone screens ₹12,000–35,000 at Apple-authorised service
Warranty Most makers replace a panel under warranty for physical panel faults that are not accidental damage; pressure marks, cracks and liquid damage are treated as accidental and are not covered. For dead pixels, each brand has a threshold (typically 3–5 bright or 5–8 dark pixels on a laptop; Dell's premium-panel guarantee replaces at one bright pixel).
Frequently asked questions What causes a yellow spot on a phone screen? Heat degrading the adhesive or diffuser layer behind an LCD panel. It is permanent, tends to spread slowly, and no setting affects it. Common causes are dashboards, charging under bedding, and heavy use while charging.
Can a green or pink line on a phone screen be fixed? Not by software. It is a broken driver connection inside the panel and it usually widens over time. The repair is a display replacement. If the line appeared with no drop or knock and the phone is in warranty, claim it.
Is phone screen burn-in repairable? No. Burn-in is uneven wear of OLED pixels and is permanent. Dark mode, lower brightness and auto-hiding bars slow it down, but nothing reverses it.
Why does part of my screen not respond to touch? The digitiser layer has failed in that area. The picture comes from the display and touch from the digitiser, so one can fail alone. Check for a cracked or dirty screen protector first, then a display replacement.
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