Help, iPhone boot loop after faulty screen fitted
 

I really hope someone can help.


I recently fitted a new screen to a iPhone 7 but upon start up the phone got to the apple logo and then restarted again. After searching the threads I thought it could be the audio ic which I tried to reball but there was no change so I put the phone aside.


Today I had another iPhone 7 and thought I could use the new screen however, the same thing happened with this second phone i.e bootloop ( the phones restore normally but then revert to a boot loop )




I had a look at the screen cable under the microscope and found a bit of solder touching ground and the top four pins ( I think they go to pins 1,2,3 and 4 on the motherboard )


I have checked the board and discovered at least pin 2 is short to ground which the schematics show as "I2C_Disp_EEprom_SDA_Conn"


I have checked FL4741, C4741, C4731 and FL4729 and all are shorted.


Can someone please help and give me some idea where the short is possibly coming from as I have two customers iPhone 7's to repair.


Thank you in advance

Check your home button cable. When damaged home button also make the phone get very hard to turn on and boot loop.

The "FL" should be shorted because it is the filter.