Time does move on for some things. When I first started working on motor vehicles (all types including farm equipment) the ignition system was breaker points, there was a carb with screws & linkages, mechanical fuel pump, you had to polarize the generator and the headlight switch on the floor always failed. Bob could put his nose in the tail pipe and Billy would twiddle screws on the carb until it smelled and sounded good. It rarely made a difference to the 8 mpg or the way the car actually ran. When it was hot you mechanically rolled down the window. When it was cold, well, I hope you ordered the optional heater. When the fan stopped you replaced the resistor assembly.
I never had computer problems.
I was good at moving the antenna on the TV to get the three channels. Drug stores had tube testers to keep the TV running.
My radio had THREE transistors. The toaster had no clock or buttons, just a dial and ejector button. The coffee pot went on the stove.
Almost everything was made in the USA and needed SAE type tools.
My current motorcycle has computer controlled ignition, computer controlled fuel injection, an oxygen sensor, a crank position sensor, cylinder identification sensor, throttle position sensor, intake air pressure sensor, etc. The ECU sends out a 5 volt reference voltage, receives back some amount of the 5 volts, runs it through a signal processor and evaluates the signal through software. The results of the evaluation is run back through a signal processor and outputs timed streams of pulses to the fuel injection and timed streams of pulses trigger the coils. The ECU sends a serial stream of coded pulses on one wire to the meter assembly where the meter assembly puts the pulses together to create addresses and values which gets sent to decoders which drive the needles and alphanumeric displays. When all that BS stops working whattcha gonna do?
Call Fred W, or mcatrophy of course.
In many ways things are much more complicated than they use to be and require more specialized skills -- but other things like disk brakes are a world better to work on than old school drums
Much more often today, when it stops working why even phuck with it, just chuck it and replace it