This is in a thread about Tesla having an 8 year warranty on the eMMC, and possibly being forced to recall all of them as they are safety critical, but maybe setting up a guy with a hot air station in the back of the local service center. Yes, I do expect Tesla to guarantee this and they already do. No, I don't expect the guy with the hot air gun to, which is why Tesla won't be using that process.
As someone that designs electronics that go in various kinds of vehicles, I can tell you the vehicle vibration and thermal stress environment is often much worse than a cell phone. Single shock events are not the primary failure drivers.
Glad you got your MCU fixed and upgraded. It's awesome to see people starting to fix stuff like this themselves.
And I challenge that the environmental issues encountered by the MCU daughterboard are any worse than a cell phone...
- MCU sits in a hot car in the summer: Cell phones get left in those same cars. And in the sun at the beach, and on the patio, etc...
- MCU is subjected to vibration during vehicle operation. Cell phones ride in those same vehicles. And in pockets while jogging. And get dropped. And literally have apps that require you to shake them vigorously, etc...
- MCU experiences thermal cycling due to use. So do cell phones, and their usage profile is much more varied and frequent than an MCU's
- MCU sits in freezing car. Cell phone strapped to the handlebar mount of my bike experiences the same.
- Etc...
I pretty much guarantee a number or those cases are worse on the cell phone side: Accelerometer data from a phone can be
crazy. That phone on my bike handlebars experiences a thermal transition from below freezing to my 74 degree house in the space of a second, far faster than an MCU will.
All of which to say,
the level of expertise necessary for this repair is on par with that necessary to replace the chip iin a phone. That is to say:
not overly-specialized. Oh, and a decent hot air station to do it is a couple hundred bucks. A really nice one is $500-600.
All of this is born out by the results. A bunch of us have done this ourselves. Our flash chips aren't falling off or failing. You might guess that in two years they will, but I expect you're wrong.
So, i don't think this is any sort of insurmountable problem for a company with the resources Tesla has.
(and with that, I'm done on this subject)