Has anyone heard of a defect in this RB's wifi?
There is a batch of devices where supposedly wifi is not detected in Winbox and naturally does not work.

Supposedly?

1) Make supout.rif
2) Email to support@mikrotik.com

No config, no details, only guessing

I don't have any configuration data yet. Just one person claims that he has 13 such RB, which does not work wifi. It's hard for me to believe this, both in the marriage of the factory, and in the fact that somehow you can kill the built-in wifi on this board. So I wanted to ask if there were similar messages ?

Again, is it possible to kill the wifi interface with the Ros7 firmware on this device?

I have not heard about such case. Send the files like suggested above.

Thank you. I think those who used these boards were doing something wrong. I'll take one and try it myself. In any case, I will report the result.

Today I received the RB912R_2nD board without a case. The board boots up, everything is fine, except for one thing - there is no wifi interface as such. There is only eth1 in the list of interfaces (the LTE modem is not installed in the mini PCI-e slot). Am I missing something or where is the wifi interface? You can install any version of POS - the same effect. I haven't tried Netinstall yet.

What version of ROS ?
Ros 6 or 7 ?
Is it bundled version with wireless included or do you need to add wireless package separately ?

Currently installed ROS 6.47.10 long-term main package.

Then you should install wireless package separately, no ?
Can you ?

Why not use latest 6.49.10 ?

I apologize for the inaccuracy. The 6.49.10 long-term package is installed. As far as I understand, the wareless package is included in the main package and it appears in my /system package. Why should I install it separately?

Earlier versions were unbundled. It could have been missing with only main package being present.
In that case I am afraid it's netinstall-time...

Since there is nothing else left, I'll try, thanks

I reflashed the router with Netinstall. Same effect. There is no wifi interface. Moreover, the one who gave me this board assures that he has 13 such boards. Could someone intentionally damage the wifi interface so that it does not work in this RB? Or could the Mikrotik company supply someone with a batch of such devices with a damaged or intentionally disabled wifi interface?

Let me clarify that I only have the RB912 board on hand, and not the LtaP mini device in the case. Could the wifi have been damaged when removed from the case?

Here is a photo of the board. In photo 2 (back side) traces of thermal paste are visible. What could be there?

I created supout.rif as Normis said and sent it to support@mikrotik.com. Perhaps Mikrotik specialists will figure out what’s wrong?

Microtik technical support is still silent. Does anyone have any other thoughts?

This is what Mikrotik technical support told me:

Hello,

It looks like the device has an HW problem, please contact the distributor form witch you bought the device and ask about the possibility of repairing it.

Best regards,
Viesturs R.

The answer must be, to put it mildly, exhaustive... I would like to ask:
What specific hardware problem? What problem can arise in a wifi module integrated into the processor chipset if everything else works perfectly? Have you encountered this problem before? Where is it described?
This is probably a manufacturing defect, since we have 13 boards with the same error. It’s strange that no one else in the world seemed to report this...

The grey marks on bottom of board are where it hits the metal heat-sink that's the bottom of case – so that's NOT a sign of trouble.

I'd really, really make sure you tried latest netinstall with latest RouterOS with all the options to reset (-r -b). Otherwise, it seems it have to be returned...

Dear Amm0! I'll probably try what you recommend. But it seems to me that the Netinstall version and the Router OS version have nothing to do with it. Otherwise, official technical support could have recommended this, but they didn’t. The Wifi interface must be defined in any version of Ros.

And it is unlikely that you will be able to return it or get warranty repairs, since the terms of the warranty are not met - the boards are “broken” out of the case, and they were not purchased from an official dealer. I'm now trying to understand how they were bought.

I also tried your advice, Amm0. After reflashing Netinstall ROS 7.11 did not help. The wifi interface does not appear in the list of interfaces. So most likely this is a factory defect.

Yeah I'd believe Mikrotik – just sounded like your options were kinda limited. But it is a strange problem - have a few of these and wifi isn't great on them but always shows up.

Only other is did you update the firmware via /system/routerboard/upgrade?

Only other is did you update the firmware via /system/routerboard/upgrade?

Yes, of course.

Flashed ROS 7.11 stable with gjvjom. Netinstall. Rebooted the router. Made /system routerboard upgrade firmware. Rebooted the router again. Everything is as I usually do. No effect - the wifi interface does not appear. At the same time , when loading in the log , this is the inscription
(something like this, I don't remember verbatim):

DefConf: warning unable find wireless interface
script error interrupt

That is, when loading, some script is executed (probably an internal linux script (Ros), since /system script and /system scheduler are empty, of course) and it no longer finds the wifi interface.

I wonder if it could be that some advanced programmer on a batch of devices got into the OS Router itself and turned off the wifi interface there? Surely it's possible.