Screen flickering, white and blue lines

Question

iPhone 6

Introdotto il 19 settembre 2014, questo iPhone con schermo da 4,7" è la versione più piccola dell'iPhone 6 Plus. Identificato dai numeri modello A1549, A1586, and A1589.

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Hernando Berg @hernandoberg

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Postato: 23 ago 2018

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Screen flickering, white and blue lines

Hello, I got a iPhone 6 in these days that had screen flickering and touch faliure sometimes and had white or blue lines over the screen. So obviously I replaced the screen first and turned it on and it still had some white lines over the screen. And the logic board got verry hot where touch ic's are located. I figured it would be a bad Mason so I replaced 2 times already with new ic and also reballed cumulus and still the exactly same problems. Not sure exactly which part is getting so hot, but that place gets too hot to touch just like before. Sometimes when I turn it on, the touch works and other times the screen gets white and blue lines all over and touch is not responding. Any ideas what to look for next?

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Minho @refectio

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Postato: 23 ago 2018

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I would check the power rails feeding the Touch IC’s to see if everything measures okay. Also look for bridged components that could be causing a partial short, hence excess current.

I would check the coil directly above Meson, L2401. It has a tendency to crack or have a bad solder connection as it is on the fault line as well. Whenever I replace a Meson, I always reflow it to be certain. If it is cracked, I would replace it.

Try applying some freeze spray (locally) to see what melts first, that may give you some guidance.

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thank you for the reply. I replaced the coil and now it seemed like it worked fine so i handed it back to the customer. And guess what, now the flashlight doesn't work anymore. Anyway, he left the flashlight switched on even though it didn't work and after a few days, the screen flicking happened once again and while the screen flickered, the flashlight worked. Once the flickering was gone, flashlight doesn't work anymore. I'm quite stuck on where to look next.

27 set 2018 da Hernando Berg

On the reverse side of L2401, you will find the LCD connector and close by the chestnut and strobe driver IC. it's possible you applied too much heat and caused some issues elsewhere.

27 set 2018 da Minho

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thank you for the reply. I replaced the coil and now it seemed like it worked fine so i handed it back to the customer. And guess what, now the flashlight doesn't work anymore. Anyway, he left the flashlight switched on even though it didn't work and after a few days, the screen flicking happened once again and while the screen flickered, the flashlight worked. Once the flickering was gone, flashlight doesn't work anymore. I'm quite stuck on where to look next. — Hernando Berg
On the reverse side of L2401, you will find the LCD connector and close by the chestnut and strobe driver IC. it's possible you applied too much heat and caused some issues elsewhere. — Minho

iPhone 6

Screen flickering, white and blue lines

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