Samsung Galaxy S4 SIM Card Issue: Reader Replacement & Factory Reset Unresolved

Question

Hello. I have samsung galaxy 4 The phone does not see the sim card I thought it had a damaged SIM card reader so I mentioned it, unfortunately the problem has not disappeared
I have restored it to factory settings and it is still the same.

antek1cza · Accepted Answer

Hello
If the sim card is ok then it does

zenekxp wrote:
I thought I had a damaged SIM card reader so I replaced it

I suggest temporarily to stick some foam at the SIM reader under the back flap closing the phone, as shown here https://www.youtube.com/watch?v=kSO89qL3Ob0.
If it helps cold solder on the motherboard, how can a friend not be a phone in a series of similar problems - more info here http://www.tomsguide.com/forum/id-2194237/samsung-galaxy-sim-card -detected-reboot.html.
In summary, it can be the fault of the card, software or hardware.

marcin7904 · Answer

See if there is a damaged IMEI Added after 1 [minutes]: Of course, write what was done with the phone before that behind him you noticed this ailment.

nutergsm · Answer

Have you checked on another sim card?

zenekxp · Answer

How to check if there is a damaged imei .. It is a customer phone brought it to repair says that he used teleofnu suddenly wanted to call somewhere and here he does not detect cards .. I checked on another sim card the same

nutergsm · Answer

Enter in the phone * # 06 #

zenekxp · Answer

I watched a movie with this sponge, unfortunately I do not have such a sponge and covered my finger with the problem, disappeared what's going on here ?? These contacts must be tightened ??

nutergsm · Answer

Since it worked after pressing it does not connect something on the disc.

zenekxp · Answer

The problem disappeared for a moment after which the same thing appeared again only now that after pressing it does not work anymore

Added after 38 [minutes]:

After inserting the card, the phone reads for a while for 5 minutes, the range is reachable, you can get through in 5 minutes, the message no SIM card pops up

antek1cza · Answer

Dear friend, what I wrote in post 6 is just a hint. If it worked after pressing it is what it writes about It means that : 1. You need to undress your phone. 2. Look for damage, cold solder, cracks, etc. under the microscope. 3. After finding repair. 4. Turn and enjoy a working telephone. If your colleague did not do it, I advise against this. How are the manual skills, the hands do not shake, high magnification (the bigger the better from 8 to 30x) and the thin needle you can try to get in the contacts in the SIM card slot and gently podokinać sourness may but it does not have to help. The above-mentioned proposals are made by a friend @zenekxp at my own risk, therefore, I advise against any doubts.

venummasa · Answer

Replace the connector with the reader as this will not help is a typical defect in this model of the damaged board. And the fact that you pressed and worked, it can only be a case, sometimes it would take 2 hours, sometimes 5 minutes and sometimes even all

nutergsm · Answer

He has already exchanged the connector, the disc replacement remains.

zenekxp · Answer

There is a new thread of this mysterious matter ...

As I mentioned earlier, the sim card reader replaced etc ...
Now I've done an android downgrade to 4.4.2 and nothing ...

I managed to determine that the card
PLAY, PLUS, Virgin Mobile - DO NOT WORK
and
ORANGE, T-Mobile, NJU Mobile WORK
tel normally detects them and catches the range on them ...

Is it somehow blocked maybe or how? I do not have an idea anymore ...

plustek · Answer

Newsletter to read.

zenekxp · Answer

Repair finished

The cold February / broken tin turned out to be close to the U203 system on the motherboard.
After examining the plates under the microscope, the cracks were visible without any problem ...

Below I provide photos of how to solve the problem of not reading the sim cards ...
I made a very thin tip for the soldering iron and renewed the connection between the system and the board ..

Unfortunately, I did the pictures after the connections were renewed (I did not think that I would run the photo as soon as I started to work) and photos
I will not include cracked solders ...

Thank you for every help!

Greetings.