Chosen Solution
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?
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.
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
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.
just replace it the U5600 ic problem slove
