laptop power supply repair

Question

Do it yourself

Hello!
there is a power supply for a universal laptop power supply with a custom voltage scale of 12-24V, but it works only from 12 to 16 V, in other cases sadness, what could be the reason ???

Answer 1

Have you tried switching the range of the tester?
Measurement of voltage under load - can also help dispel sadness.

Answer 2

Try switching the voltage to cold and turn it on.

Answer 3

If this is a Chinese PSU, then the problem can be anything, starting with the fact that the Chinese engineer conceived it as a 12-16V PSU, and the Chinese marketer mixed everything up and wrote 12-24. And if before the PSU worked as it should, then it is necessary to open the patient) In this case, a visual inspection should be started with capacitors. Are you talking about impulse?