Horizontal pixel lines failure for with screen replacement.

Question

iPhone 5s

O iPhone 5s da Apple foi anunciado em 10 de setembro de 2013. O reparo deste dispositivo é semelhante ao de modelos anteriores e requer chaves e ferramentas de abertura. Disponível como GSM ou CDMA / 16, 32 ou 64 GB / nas cores prata, dourado e cinza espacial.

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Tamas Korodi @krdtms_90

Rep: 1

1

Postado: 6 de mar de 2017

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Horizontal pixel lines failure for with screen replacement.

Hi people,

I have came across this problem a couple of times already. Thing is, I get a brand new replacement screen (from different sellers), fit the new screen without any problem, and when turning the phone on, this fault appears at the bottom pixel lines of the new screen. See pictures attached:

https://drive.google.com/file/d/0BzpvsfJ...

I have got some of the screens changed by the sellers, both of us thinking it was a factory issue. I tested the last screen I had recieved though, and it worked well for the first connection. After the - careful - assembly of the phone, these lines appeared. Of course, no hard reset would help.

I have replaced screens on a couple of iphone 5s models without any problems. It seems like this particular phone so to say 'ruins' the perfect, brand new screens during the installment.

I have got a new screen now, waiting to be installed, and I would like to ask you what would be those things in your opinion I should handle with special care. I can assume it's the ribbon cable bending in a bad way, or being pressurised by some other components.. or maybe the LCD display's socket on the motherboard is worn out that much that it damages the connector. I have no magnifier, so I don't see.

I have also tested the phone with another screen I use for test (it has broken glass, so this is its only purpose now), and it worked well, no pixel issue.

Could you give me some hints, please?

Thank you.

Tamas

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Lettucejuice @lettucejuice Rep: 199 5 · Answer 1 · 2017-03-07T15:35:38-07:00

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Lettucejuice @lettucejuice

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Postado: 7 de mar de 2017

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Did you try the screens on without screws in the connector shield plate on the motherboard? Maybe it could be a long screw damage of some sort and it shorts certain circuits when a screw is in place?

Does the screen work when it's not fitted into the metal body?

Check the motherboard connectors for damage too.

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Yes I did. The screw lenghts were alright. When I first connected to test, it had no issues, after full assemly it produced the fault. From then on no matter how I tried connecting it, didn't work, kept the fault. I have already read about the longer screw problems, so I pay attention that every screw is as long as it needs to be.

The screen doesn't work, even if just the connectors plugged in, nothing else is assembled (not even the front-cam assembly).

As I said, I haven't got a magnifier to check it. I made high-res pictures from it with phone and I didn't see anything abnormal.

Thanks for the hints though, they were good ones.

7 de mar de 2017 por Tamas Korodi

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Tamas Korodi @krdtms_90 Rep: 1 1 · Answer 2 · 2017-03-07T16:18:48-07:00

So I have managed to assemble the phone with a new screen, and works fine.

All major steps were followed by screen tests just in case if it produces the fault again I can narrow down the causes.

I am not 100% sure, but I might know what I've missed until now.

Before now I hadn't wraped the ribbon cable firmly. The front panel has a plastic edge above where the ribbon cable comes directly from the LCD (just above the IC intergated on the cable). I guess that edge functions as a holder to keep the bend of the LCD - digitizer - front camera assembly cables in place. What I can assume is that without wrapping the brand new, plain ribbon cables properly under this, as you click the screen and the housing together in the end the cables get stuck and pressurised under this holder edge , thus damaging the ribbon cable. I don't know how these cables work, but it is still odd, that only the bottom couple of pixels went nuts nothing else on the screen. Like it was damaged at the same place, with every occasion.

Anyways. It works now. I hope that Lettucejuice's answer and my finding will help somone in the future.

iPhone 5s

Horizontal pixel lines failure for with screen replacement.

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