Is it possible to programmatically see the voltage on the power supply of the laptop or see power errors?

Question

Iron

Such bullshit.
There is a PSU for a laptop with variable voltage. from 12 to 24 volts several modes (manual switching). my laptop is 19 volts 4.7 amps.
In general, I bought it connected. All the rules were for six months.
Right now I turn it on for 5 seconds, all the rules then give a power error (the power and charging diodes are blinking). But at 20 volts everything works.
So I need to find out how much voltage comes to the mother board or whether there are power errors.

Answer 1

If the PSU constantly goes into protection or disruption of generation, then you won’t particularly measure the real voltage with a multimeter, then the oscilloscope will help and then in general the average voltage (although again it depends on the conditions).
In fact, between 19-20c there is no difference for a laptop, but judging by the symptoms of BP, it is strongly Chinese, most likely that with a drawdown from your 20s and a maximum of 18-17 comes out. In any case, this is already an incorrect operation of the PSU, so drag it to the service.