Guide To LCD Rejects

The Asia MTM Group Limited Guide to Rejected LCDs

There are many reasons an LCD may rejected. Sometimes the screen itself is badly damaged, sometimes it’s a minor issue that significantly devalues the screen and sometimes the issue is more internal, such as a bad cable. Below you will find a detailed guide to what common problems can occur and result in a rejected screen.

Cracks – Cracks in the screen are fairly common, and vary in size and shape. Sometimes you will see a crack across the entire screen, other times it may be very small and/or hard to spot. A variety of other effects can be caused by these cracks such as lines in the display or the liquid crystal (which looks like a black liquid) leaking from the cracks.

Blemishes – A variety of things can be considering a blemish on the screen. White spots caused by water damage, scratches or other physical marks on the LCD often caused by tools or adhesives yellow or orange marks can be rejected depending on their severity. Colored smudges can also occur due to several reasons and are generally rejected. These smudges can vary in size, shape and brightness and appear in a multitude of colors such as red, pink, blue, yellow or purple. It is not uncommon for multiple colors to appear in these smudges.

Pixels – We reject any screen screens with dead or frozen pixels. Pixels can appear anywhere on the LCD in several different colors. They can sometimes be not so obvious, but if a tester spots a dead pixel the screen will be rejected regardless of the pixel’s size or color.

Pinpoints – “Pinpoints” are smaller, shimmery pixel defects. They appear white or iridescent, can vary in size and often appear and disappear depending on the viewing angle. A single tiny pinpoint may still pass as a good LCD, however, a much brighter pinpoint or multiple pinpoints may result in a lower grade or rejected LCD.

Red Shadows – A not so uncommon issue with iPhone LCDs, particularly third party LCDs, are red shadows, also known as “pink pills”. These appear on a white screen and look like a pink or purple rectangle in the center of the screen. Red shadows can vary in size and brightness and will result in a lower graded screen.

Cut Flex Cables – A cut or damaged flex cable means the screen cannot be tested properly and will therefore be rejected.

Bad Digitizers – Occasionally an LCD may appear undamaged but have internal issues that result in rejection. Usually these issues are either in the form of lines and/or blocks on the screen or the LCD touch may not be functioning properly. Depending on the assessment of our experienced testers, these issues may be considering minor or temporary and can result in lowering the grade or outright rejection.

Dim Display – Sometimes an LCD will have a functioning display and touch, but will appear darker or dimmer than it should. This will result in rejection or lowering of grade.

We hope this has been informative and we want to thank you for reading. Please contact us if you have any questions. We sincerely appreciate your business!

 

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