Issue with motherboard or battery??

It’s not “disrespectful”. It’s simple fact. Unauthorized service providers do not have legitimate access to genuine Apple parts.

The only advice we can give you is to take it back to whoever did the original repair and ask them to make it right or buy a new phone that works.

The phone has been tampered with by unauthorized persons using non-genuine parts. So, you will likely have to continue using the shop that you used before....or....buy a new phone.

It's a long shot, but take the phone to an authorized Apple service shop and see if they can help. Worst case, they won't even look at the phone. Best case, they might at least take a look at the phone if they don't know about the previous unauthorized service attempts.

You can find a list of authorized Apple Service shops in your area using the link just below. Good luck.

Find Locations

Yes, that is why it is so important to set up daily backups. Assume that the motherboard needs to be replaced. The new motherboard will not have any of your data stored on the replacement part.

There is really no excuse for not having backups, since you can set up the phone to back up automatically each day.

Unfortunately, your phone is now unsupportable.

Take it back to whoever worked on it. We can’t help you and Apple won’t touch it now that it’s been tampered with.

If you want a guess, the phone will need new hardware.

But....unless you have a recent backup of the phone, you will lose the data on the phone during any hardware repairs other than a battery replacement.

Even if you decide to proceed, do you really want the shop to use non-genuine parts?

If the work is done by a competent technician, things like a battery or screen replacement do not usually result in loss of data. (Note that in the case of a screen replacement, the data is often already unrecoverable as the Lock Screen passcode has been entered incorrectly too many times before a repair is attempted).

Anything else will absolutely result in loss of all data since there is no removable storage. If there is a logic board problem, the logic board has to be replaced, meaning the storage media is replaced as it’s soldered to the board.

Was the ‘repair shop’ you took it to an Authorized Apple service provider?

The repair shop can only try to make it "right" by installing non-genuine Apple parts. Do you really want them to do this?

Our advice.....buy a new phone.

Unfortunately, you are likely telling us that you don't have backups.

Locate backups of your iPhone, iPad, and iPod touchApple SupportOfficial Apple Support › en-us