Tabhairt isteach
Buying a replacement smartphone screen—whether for repair, resale, or personal use—can feel like a gamble. Some screens look fine at first glance but hide defects that will cause headaches later. An dea -scéal? You can spot most of these issues on the spot, before you ever hand over your money.
Sa treoir seo, we’ll walk through 4 screen features you must NEVER accept, along with simple on-site testing methods so you can return defective items immediately.
Let’s make sure you never get stuck with a bad screen again.
1. Yellow Corners When Displaying White (Backlight Aging)
What Yellow Corners Look Like
When you open a pure white image and notice that the corners appear yellowish or warm-tinted, that’s a red flag.
It usually looks like:
- Tá na ceithre choirnéal beagán "salach"
- Halo te, go háirithe faoi deara faoi solas geal
- Leibhéil gile míchothrom
Cén fáth a dtarlaíonn Aosú Backlight
Tagann an locht seo le feiceáil nuair a bhíonn scannán backlight an LCD sean nó ró-théamh. Is minic a thugann le fios:
- Níl an scáileán branda nua
- Tá an backlight curtha in ionad go dona
- Úsáideadh nó athchóiríodh an painéal roimhe seo
I mbeagán focal - coirnéil buí = seanscáileán ag ligean air gur nua é.
Conas É a Thástáil ar an Suíomh
- Cumhacht ar an scáileán
- Oscail cúlra bán (app ceamara, bhrabhsálaí, nó uirlis tástála)
- Méadú gile go dtí uasmhéid
- Breathnaigh ar na ceithre choirnéal
Má fheiceann tú buí, fiú beagán, é a dhiúltú láithreach.
Cén Fáth ar Chóir duit é a Fhilleadh
Leanann backlight ag dul in aois ag dul in olcas. Is gearr go mbeidh mílí soiléir ar dhath beag buí an lae inniu. Titfidh feidhmíocht agus gile le himeacht ama.
2. Éifeacht Ripple Uisce Nuair a Brúitear Beagán (Teip Ciseal Tadhaill)
Cad is brí le “Water Ripple”.
Nuair a bhrúlann tú an scáileán go héadrom agus go bhfeiceann tú ripples ag scaipeadh mar uisce tadhaill, sin comhartha éagobhsaíocht ciseal dteagmháil.
Ba chóir go mbraitheann scáileán sláintiúil soladach gan aon saobhadh cosúil le leacht.
Cúiseanna Scaradh Sraithe Tadhaill
Tagann an éifeacht ripple de ghnáth ó:
- Nascáil lag idir na sraitheanna tadhaill agus taispeána
- Droch-chaighdeán lamination
- Painéil damáiste de bharr teasa nó brú le linn athchóiriú
Conas Tástáil Le Brú Solais
- Cuir an scáileán ar dhromchla réidh
- Brúigh go héadrom timpeall coirnéil nó sa lár
- Seiceáil le haghaidh saobhadh wavy, fáinní, nó leacht-mhaith ripples
Rioscaí Fadtéarmacha
Beidh scáileán leis an gceist seo:
- Caill cruinneas dteagmháil
- Criosanna marbh a fhorbairt
- Taispeáin dídhathú an tuar ceatha
- Faoi dheireadh theipeann go hiomlán
Tá an locht seo ar an toirt UIMH.
3. Green Spots on a Powered-Off Screen (OLED Burn-In)
How to Identify Green Patches
This defect appears even when the display is as.
Cuardaigh:
- Light green haze
- Irregular patches or dots
- Areas that stay green even when the screen is black
Why OLED Burn-In Happens
Burn-in occurs when OLED diodes wear unevenly due to long-term display of static images.
This means the screen is:
- Not new
- Previously used for long sessions
- Likely harvested from old devices
How to Test It Correctly
- Turn off the screen
- Tilt it under white lighting
- Inspect the black surface for greenish marks
If the green patches exist while the screen is off, run away.
Why This Is a Severe Defect
Burn-in is permanent and irreversible.
Once you install it, the issue becomes even more obvious. This is one of the worst defects you can receive.
4. Bent or Damaged Flex Cable Pins (Connector Defect)
What Bent or Missing Pins Look Like
Before installation, always check the connector.
Warning signs include:
- Bioráin lúbtha
- Missing pins
- Misaligned gold contacts
- Dirt, oxidation, or scratches
How Pin Issues Affect Installation
Damaged connectors can cause:
- Gan taispeáint
- Fliceáil
- Teip dteagmháil
- Short circuits
- Permanent motherboard damage
How to Inspect the Connector Before Buying
- Hold the flex cable under strong light
- Look closely at every pin
- Ensure spacing, alignment, and glossiness are uniform
Why This Defect Is a Dealbreaker
Once installed, pin defects are irreversible.
You might even end up damaging the phone’s board—far more costly than the screen.
Never accept screens with connector problems.
How to Perform an On-Site Inspection Quickly
Step-by-Step Routine
- Check appearance (no scratches, glue marks, deannach).
- Test brightness and white screen for yellow corners.
- Test touch pressure for ripple or separation.
- Inspect powered-off screen for green spots.
- Check flex cable pins for perfect alignment.
- Final full-function test (teagmháil, dath, gile, camera hole alignment).
Tools You Should Bring
- Small LED flashlight
- Preloaded test images (white/black/red/green)
- Phone body or tester
- Microfiber cloth
Common Mistakes When Checking Screens
- Not viewing under strong light
- Only checking the display, not the flex cable
- Rushing the test because the seller is waiting
- Believing “it’s normal” excuses
If something looks off, it’s probably defective.
Why These 4 Defects Are Immediate Return Reasons
They Indicate Aging or Refurbished Parts
Most of these flaws appear in recycled or poorly refurbished screens.
High Risk of Installation Failure
Is minic go mbíonn saincheisteanna suiteála nó teip ghearrthéarmach mar thoradh ar lochtanna nascóirí nó tadhaill.
Mífheidhmiú sa Todhchaí Beagnach Ráthaithe
Fiú má oibríonn an scáileán inniu, téann na lochtanna seo in olcas le himeacht ama.
Leideanna chun Scáileáin Ísealchaighdeáin a Sheachaint
Roghnaigh Soláthraithe Iontaofa
Cuardaigh soláthróirí le fardal cobhsaí agus cáilíocht chomhsheasmhach.
Seiceáil Beartais Bharántas
Cuireann soláthraí maith rialacha athsholáthair soiléire i gcónaí.
Raon Praghsanna Margaidh a thuiscint
Má tá praghas “ró-shaor,” is dócha go bhfuil an painéal athchóirithe nó lochtach.
Deireadh
Ní gá go mbeadh riosca ag baint le scáileán athsholáthair a cheannach. Trí fhoghlaim conas iad seo a aithint 4 lochtanna criticiúla— coirnéil bhuí, éifeachtaí ripple, glas sruthán-i, agus bioráin flex damáiste - is féidir leat botúin chostasacha a sheachaint agus a chinntiú go mairfidh do dheisiúcháin níos faide.
Déan tástáil críochnúil ar an láthair i gcónaí. A few minutes of inspection can save hours of frustration and prevent financial loss. Stay sharp, stay cautious, and never settle for a defective screen.
Ceisteanna Coitianta
1. Are yellow corners always caused by backlight aging?
Tá. This is the most common sign of an aged or refurbished backlight system.
2. Can OLED burn-in be repaired?
Níl. OLED burn-in is permanent and cannot be reversed.
3. Are water ripple effects normal on some screens?
Níl. A quality screen will not show ripple distortions under light pressure.
4. Should I refuse a screen even if only one pin is slightly bent?
Tá. Even one damaged pin can cause boot failure or short circuits.
5. How long should an on-site inspection take?
A careful check typically takes 3 chuig 5 minutes once you know what to look for.
