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Quick UPS repair - symptoms: dead. No reaction to connecting the power supply and trying to turn it on.
It did not indicate a fault until the power failure - then it turned off and did not turn on again - even after the power returned.
In this case, a screwdriver was enough for the repair.
If you have such a UPS - it is worth checking before throwing it away - repair is easy, and this is a common cause.
see also:
Fuses, ES - i.e. circuit breakers for beginners and not only in theory and practice
Short Circuit Loop Impedance for beginners and more - what it is, how to measure, how to interpret
Waveforms, TruRMS, PWM, duty cycle %. For beginners and more
Measurement errors for electronics beginners and others - when? How? What for? useful patterns
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