Fix Your Stuff Community Store

Released September 16, 2016. Model 1660, 1778 Available as GSM or CDMA / 32, 128 or 256 GB / Rose gold, gold, silver, black, and jet black.

2264 Questions View all

Options

iPhone 7 baseband problem

Please help. After repairing the audio system on the iPhone 7, the phone lost its network. He stopped showing the IMEI number.

I was able to desolder the baseband and clean the main board from the remaining glue. Many solder pads have been removed, but these are NC fields.

Block Image

I have obstructed the system twice and, unfortunately, the IMEI number is still missing, the phone has been uploaded and 3utool displays error -1 at 80%. On one forum, someone said that he sees the problem in the picture, but he does not want to provide information on what the problem is. Thank you for your help.

Update (01/10/2019)

Unfortunately, there are so many servants in Poland who are happy with someone's problem.

I have checked the capacitors and have no short circuits.

On the voltage coils as in the attached picture.


Block Image

Thank you for your help, I do not hide that I did it for the first time and it would be nice if the phone started.

Answered! View the answer I have this problem too

Is this a good question?

Yes No
Score 2
Add a comment

4 Answers

Filter by:
Most Helpful Newest Oldest
Chosen Solution

Options

What kind of person would frequent a public forum on repair, leech information from others but not share knowledge themselves? They’re either full of it or (insert your favourite adjective here ;>).

Looking at your picture quickly, the pull looks pretty good. I would double check all of the pulled pads to insure they are NC. Also, inspect the right hand side where we can see some scratching while you removed underfill. Insure it doesn’t damage any traces. Also check the components at the top, they may have been damaged during the Audio IC repair or during the BB removal.

Check all the caps around the BBPMU to see if any of them are shorted.

The Audio IC repair, while presented as a routine repair, is truly one of the more terrifying repairs out there because so much can go so wrong, so quickly. This is especially true on the Intel BB boards as there is so little information available out there.

Was this answer helpful?

Yes No
Score 5

4 Comments:

Hi @refectio @boneksl I'm not an iPhone repair technician but had quite similar problem. My iPhone 7 (A1660) got no service, brought it to a repair guy and he reballed the baseband IC and the problem still exist. iPhone can't be activated because IMEI is not showed up. He said that the CPU IC might already weak and there's no other solutions, otherwise I have to replace the logic board.

I'm just looking for another opinions from you, is it true that if the BB CPU is broken then there's no other solution?

Thanks

by

Hello @iqnaul, that is correct. If the Baseband CPU is damaged internally, then it cannot be replaced as it is code-locked with the CPU and cannot be re-programmed.

by

Thank you for your explanation @refectio I think I'm going to just sell my iPhone at very low price.

by

is a common failure when repairs audio ic, thats cause due to a wrong pointing of the hot air flow to the bbpmu thats located next to the audio ic, so the solution is to reflow that ic,if still not works you will have to reballing it or replace it.

by

Add a comment

Options

First check BBPMU then BBcpu.

Was this answer helpful?

Yes No
Score 1

1 Comment:

yes first check short around bbpmu as gsm solution said and the change the bbpmu reballing bbcpu is the last option left .

by

Add a comment

Options

This is actually a faulty baseband ic that can (I don’t know if it’s visible that you repaired your iPhone) be replaced free by Apple. It’s for the A1660, A1779 and A1780.

The baseband is wrong produced in these models so it needs to be replaced by another baseband chip by another make.

Was this answer helpful?

Yes No
Score 0
Add a comment

Options

have same problem ip7 intel, error cant accept baseband data after i have for reball bbcpu,

no short at bbcpu, n then i have all check pads of bbcpu n bbpmu have no short all diode measure is same, after that still same, error can’t accept baseband data, no imei keep searcing no service before i have reball bbcpu n bbpmu only triangle on the corner now have searcing n no service can help me

Was this answer helpful?

Yes No
Score 0
Add a comment

Add your answer

boneksl will be eternally grateful.
View Statistics:

Past 24 Hours: 5

Past 7 Days: 27

Past 30 Days: 95

All Time: 34,634