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2017年9月22日発売。モデル番号はA1864, A1897。GSM もしくはCDMA/容量は64もしくは256GB/仕上げはゴールド、シルバー、スペースグレイ。

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iPhone 8 Plus Backlight/Black Shadow Problem

Hey!

My iPhone 8 Plus has a black shadow on the right bottom corner of the screen after I changed the LCD Screen. Could this be a bad Backlight IC? If yes where is the Backlight IC on the motherboard and would changing it fix the problem like it does on the other iPhones. Couldn’t find anything on the internet for the 8 plus regarding the issue I have.

Thanks,

Fahad

Update (08/27/2018)

I checked the motherboard and turns out the pin 45 was bad on the J5700 connector. So I flipped the board to check the fiter/fuse and the small C5733 is bad. What do I replace it with?

Block Image

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The shadow is because you have one of the two strips of LEDs that make up the backlight not working, and it is usually not working because it has an open line in this scenario. You create an open line on the backlight circuit either through damaging a pin at the connector, or connecting a screen without first disconnecting the battery which can blow the backlight filter, or if you have a water damaged induced short (or spontaneously occuring) on one of the two backlight circuits.


You’ve already ruled out bad screen which was another possibility, so you know this is a logic board repair. You can either buy all the equipment and learn how to do microsoldering and board level troubleshooting (iPhone 8p backlight is not bad for a beginner project), find a local microsolderer or use a mail-in logic board repair service.

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Yep the lower right backlight strip is probably not working. Where is the BL IC/Filter on the Motherboard since I can’t find it online.

さんによる

Look it up on the schematic. If you need help, then tell us what you are thinking as you look at the schematic and we will let you know if you're on the right track. Start at the connector and try to figure it out.

Step one is to figure out if you have a short or open on the backlight anode and cathode lines for either backlight circuit on the 8 plus.

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theres a chip on the lcd flex in the lower right area, it maybe isnt aligned properly and causing it to push on the lcd

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Nope, Installed the old LCD back and same issue. Lower right has a black shadow.

さんによる

did you try the screen without clipping it in to see if the shadow is still there

さんによる

Yes it was there when out too.

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Is the backlight coil is a long ic located next to the charging port conector. Put pressure on it and see if the black shadow goes away.

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just replace it the U5600 ic problem slove

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Fahad Zareef Khan さん、ありがとうございました!
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