Samsung S21 FE wifi not working

[giulio93]

Hi everyone, I have a Samsung S21 FE with no wifi. I can't see the classic antenna cable so i suppose it is integrated in the circuit of the mobo. Can anyone help me with this?
I have very good skills in soldering and stuffs.
Thanks

[giulio93]

No one can help me?

[mon2]

What is the history? Are you sure the fault is hardware related?

https://eu.community.samsung.com/t5/...g/td-p/8986840

[giulio93]

What is the history? Are you sure the fault is hardware related?

https://eu.community.samsung.com/t5/...g/td-p/8986840

I tried to hard reset but the problem Is still here, so I suppose it's and hardware problem.
So the problem could be the flat cable (te he G990U_FRC_R02?) or the commectors of It in the 2 board?
Both the flat' connectors and the mobo's connectors seam fine to me

[mon2]

Post clear pics of the flex cable.

[giulio93]

Post clear pics of the flex cable.

My phone don't have nice macro. I Will try, let me know of i have to focus on a particular detail

[giulio93]

Post clear pics of the flex cable.

Do you see something wrong?

[mon2]

Did not see this till now. Mostly look ok but do review the attached.

[giulio93]

Did not see this till now. Mostly look ok but do review the attached.

the connector is soldly down in plase.
In the "missing spot" i see 2 micro smd.
I don't understand the "switch". It is a question?

[mon2]

Is that a switch or a broken part of some type? Unable to see it clearly. Perhaps not related to the wifi fault.

Here is a good video on this model:

https://www.youtube.com/watch?v=T5qQjtJrxzc

The wifi cable should look like this:

https://www.aliexpress.com/item/1005004556516691.html

Was this unit water damaged? It is possible that the BGA balls are corroded if there was liquid damage to the phone and the WIFI module is not visible to the logic board.

[giulio93]

Is that a switch or a broken part of some type? Unable to see it clearly. Perhaps not related to the wifi fault.

Here is a good video on this model:

https://www.youtube.com/watch?v=T5qQjtJrxzc

The wifi cable should look like this:

https://www.aliexpress.com/item/1005004556516691.html

Was this unit water damaged? It is possible that the BGA balls are corroded if there was liquid damage to the phone and the WIFI module is not visible to the logic board.

The wifi cable looks fine to me. The phone has no liquid damage. Do you know where the wifi chip is located? If it is a BGA, like I think, must be visible on the board

[mon2]

Review the post from amylen97 on page 1:

https://eu.community.samsung.com/t5/...s/td-p/9010242

[giulio93]

Review the post from amylen97 on page 1:

https://eu.community.samsung.com/t5/...s/td-p/9010242

I've tried anything wrote in the link but doesn't work. I think is a hardware issue. I still did not understand where the wi-fi chip is. I woul try a reflow in the case

[mon2]

Hunt for an IC that may look like the following:

https://www.aliexpress.com/item/1005004304800748.html

[giulio93]

Yesterday I reflow the gray chip and the wifi come back to life!
Thank you all for your support

[mon2]

Well done! Apparently a very common problem with this model.