iphone install unknown error (1) - NOT battery

[ejafman]

Hi all, water damages iPhone 4s I am trying to help fix for a friend (I have already done simple things like LCDs, and I'm not too bad at soldering).

Newbie here...I tried searching, but all talk about this error regards the battery, which I have swapped out.

OS install log specifies:
[15:02:14.0817] update_baseband: bbupdater error: The operation couldn\U2019t be completed. (BBUpdater error 50 - Failed creating a communication transport to baseband.)
[15:02:14.0817] Update[Baseband] error - The operation couldn\U2019t be completed. (RamrodErrorDomain error 1004 - update_baseband: failed querying baseband info)

I have also searched, and visually inspected the board with jeweler's glass. I have looked at the Baseband Power IC ship (looks OK). The only visual clue I see are burn marks on top to the metal shield, directly over the Accelerometer and Gyroscope ICs.

Any ideas how to troubleshoot? Also, I tried to find the 4s schematics, and found post 25 in the sticky, but it tries to save as a PHP, rather than a RAR.

Any help appreciated...

Eric

[ninos22]

It is baseband problem (always error -1)

[ejafman]

and? Probably that means that the IC has to be reballed? I have a hot air gun, and can look at trying that, but I am curious as to the troubleshooting I can do to trace if it is indeed that, or another smaller component along the path.

I will do more searching in regards to baseband errors on this site, to see if I can look further into this.

Thanks.

[ejafman]

I also want to mention that I see a lot of posts about baseband issues, and that the error code is -1, but my error is 1.

Are negative 1 and positive 1 the same error (I wouldn't think so, but I don't see negative error codes listed on apple forums)?

Eric

[lowmaster]

there is no negative. thats all error 1

try icing components with spray. This worked for me to narrow down the faulty component. Start with power relates chips...

[ninos22]

Originally Posted by ejafman

I also want to mention that I see a lot of posts about baseband issues, and that the error code is -1, but my error is 1.

Are negative 1 and positive 1 the same error (I wouldn't think so, but I don't see negative error codes listed on apple forums)?

Eric

It is the same error -1, 1. BASEBAND, and is almost impossible to reball this ic. You need hi level professional skills for this repair.

[ejafman]

Thanks for clearing my confusion in regards to -1 and 1. I will also try to use you suggestions.

I found a thread discussing voltage amounts across certain components related to the IC itself, but it was for a 4, not a 4s. Not sure if the cicuit is the same, but I will take a look at the schematics to see.

Thanks...Eric

[gengar]

In my case C10_RF was missing and U19_RF was out of its position. Repairing these two things has solved error 1 problem while restoing an iPhone 4s

[bluemohin]

you must change usb ic and restore again 100% solved. try it.

[ejafman]

Thanks Gengar and bluemohin...I will look into those. Funny though that I don't see any damage to either of those 3 parts, my only damage seemed to be directly over U3,L9 and U17 area.

Any way to test the circuit to the parts you mentioned? Voltage readings?

[gengar]

You should compare voltages with other working motherboard.

EDIT: If you suspect that some parts might be burned - unsolder them and check. I don't think that water could damage baseband IC's because they're secured by glue. Make good inspection, always compare with other working motherboard and you should be able to find the solution.

[ejafman]

Thanks...didn't think of that. Of course, I don't have another 4s logic board hanging around at the moment, though.

Will voltages read same in restore mode vs. regular mode?

[gengar]

Not sure about that.

[ejafman]

No worries...appreciate the input