I have many rb-xxx wireless boards with faulty eth ports as they're used in outdoor units (atmospheric events, electrostatic discharge etc.) the rest of board is ok
Does anyone know the common faulty device , ethernet transformer, ethernet IC (thinking about replacement) ?
Thanks

Have you considered proper install techniques and protections, so that no such repairs are needed?

Have you considered proper install techniques and protections, so that no such repairs are needed?

Sure the OP has, but that is the future, he is asking about the past (errors).

BTW, I couldn't find anywhere Mikrotik's manual on best practices on installation of outdoor units, do you have a link?

@OKNET
Not necessarily specific to Mikrotik, but repairing/replacing components on modern electronic hardware is in itself (i.e. even when you already know for sure what needs to be changed) a big PITA (replacing an electrolytic capacitor or a SM resistor or TVS or similar is doable with a lot of patience with "common" tools but a lot of the soldering nowadays needs a soldering station, often a bench microscope, sometimes pre-heating ) so - unless you can do it yourself and have the tools - you need to go to specialists that (IF you can find them) will be able to identify the issue, but since these people are nowadays pretty much rare, they tend to be not cheap, thus it is usually not convenient pricewise to do such repairs on low-cost devices.
And anyway when the cause of the damage is high voltage electricity peaks/discharges, even if what is to be replaced is a single component, a number of other components may have suffered and even if they appear to work now they are a weak point that may fail tomorrow.
If you do the repairs yourself, then it is different, it can also be "fun".
Recent anecdata, a telephone PBX (a "good" brand one, Bosch/Tenovis/Avaya) started doing weird things (we suspect caused by a return current via ground due to a lightning that fell nearby), the PBX is a modular one, so in a perfect world it would have been easy to just replace the failed module, but of course it is out of production/no spares available, noone I could find was willing to even attempt a repair, until I managed to find someone (in another city) that would send me temporarily a refurbished one and then repair mine, it worked out well, but at the end of the day, including shipping back and forth the repair costed around 250 Euro, if we exclude the rent of the refurbished unit and the shippings, the repair in itself would have costed around 100 Euro, of which maybe 5 Euro being the cost of the replaced components.

Have you considered proper install techniques and protections, so that no such repairs are needed?

Sure, I follow guidelines for avoiding faults, fortunately all of these faulty boards don't came from my installations

Jaclaz: of course I would repair myself (I have a litle skill from old times, despite SMT requires some new tools), and yes, in many cases repairing is not possible or not worthing.
But is always a pleasure when you repair some tens or hundred € devices with few cents of components, sometimes it happens...

Then, if it also "fun", it is alright.
There are repair instructions for some models floating around, some googling for "Mikrotik repair manuals PDF" (without quotes) or similar will give you some relevant documents, even if not for your specific routerboard models, I presume that the elettronics around ethernet ports will be similar.
Here on the forum search for posts by user "aaa", he often gives hints and advice for which components to check.
Look also on YouTube (only sometimes useful, basically you will look at random guys hovering a heat gun over boards for minutes providing little if any useful details).
Then finding (in small quantities) the components will be in itself a (deep) rabbit hole.
Good luck for your new endeavour.