So one day my DSLR stopped working, it doesn’t turn on anymore. I removed battery, recharged it to make sure it has juice but camera still doesn’t turn on.
I found a YouTube video suggesting to remove sd card, battery, lens overnight and should work the next day. But it didn’t happen for me. So i just let it sit there on its bag for 2 weeks. I completely forgot about it and today it started working again after putting the battery in and sd card.
What happened there?
Interesting… All my cars up to now (mostly German brands) had the direct connection between negative battery terminal and chassis.
But as already said, newest car is already 15 years old, so might have changed by now…
The topic of contact resistance is a separate one, would show as voltage drops during heavy load situations. Similar to high internal battery impedance during winter especially for an older battery, when all the lights go out when starting the engine. This is mainly due to the high start current drawn by the Diesel engine (Diesel engines also being uncommon in the U.S. afaik?), so the electronics are designed to cope with this severe voltage drops.
Yeah, US and JDM cars are predominantly gasoline engines. Engine start current draw is similar between the two engine architectures but gasoline engines with their spark plugs would certainly cause noise on the ground line during normal operation which is probably the biggest reason for the dedicated ground line. The digital electronics would also be sitting behind a down regulator that I’d be willing to bet isolates the ground as well.
I still lean towards the original topics failure mode being electrical based not software. Software faults tend to be highly repeatable and almost always persist across full power drains since, assuming no underlying electrical issues exist, computers execute software instructions perfectly every time. Given the exact same set of inputs and the exact same timing, they’ll get back to the same state. And that would have been happening since the factory.
Degraded electronics could be feeding new or unexpected inputs into the computers that trigger different software state transitions that then lead to unintended or unexpected behavior, but things would have to be going pretty off the rails for the system to pass all of its built in tests and not realize something has gone wrong.
Another possibility is the mechanic found loose harnessing, connectors, did a few different unplug/plug cycles and then only told you about the battery.