Réparez vos affaires Communauté Boutique

Sorti le 16 septembre 2016. Modèle 1660, 1778. Disponible en GSM ou CDMA / 32, 128 ou 256 Go / Or rosé, or, argent, noir et noir de jais.

2265 questions Voir tout

Options

iPhone 7 stuck in Boot loop after shorting Display plug pins

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

Répondu ! Afficher la réponse J'ai le même problème

Cette question est-elle utile ?

Oui Non
Indice 1
1 commentaire

Thank you for your comments .

I have determined it’s a short within the Cpu which cannot be fixed

par

Ajouter un commentaire

1 Réponse

Filtrer par :
Les plus utiles Les plus récentes Les plus ancien(ne)s
Solution retenue

Options

If I understand correctly, the same, new replacement screen caused identical boot-loop issues on two separate phones? And you found that there was poor soldering on one of the connectors causing a solder bridge? If that is correct, then you should either fix the poor soldering on the screen connector or have your supplier replace/refund the screen.

As for the short, is I2C_Disp_EEprom_SDA_Conn shorted when the screen is connected only or even without a screen connected?

You went pretty quickly from replacing a screen to reballing the Audio IC without trying a known-good (or even the original) cracked screen. Perhaps you did other troubleshooting in the interim. If you are proficient at reballing mid size IC's, then we can eliminate that as a variable...otherwise, it is always possible that that caused issues as well.

Based on your description of the issue, I would just focus on getting a known-good screen and work from there.

Cette réponse est-elle utile ?

Oui Non
Indice 1
Ajouter un commentaire

Ajouter une réponse

oliverkoppel sera éternellement reconnaissant.
Nombre de vues :

Dernières 24 heures : 0

7 derniers jours : 2

30 derniers jours : 2

Total : 165