bigal_scorpio
Active Member
Hi to all,
I have a HP laptop that has a faulty PSU, it is a strange one with a 5 pin USB-like plug that is reversible as only 3 pins are used and all 5 pins in the laptop are mirrored.
The center pin is a signal to the laptop of some kind and without it the laptop does not see the PSU as present.
I just bought a new PSU from the net and though it is outputting the correct voltage I think the signal may be wrong.
The circuit below shows how the signal wire is connected through a small circuit from the output of the PSU but I can't figure out what its supposed to be doing, so I can't tell if the signal is OK!
Can anyone explain to me what the circuit does and what it should be outputting so I can check it?
Thanks Al
I have a HP laptop that has a faulty PSU, it is a strange one with a 5 pin USB-like plug that is reversible as only 3 pins are used and all 5 pins in the laptop are mirrored.
The center pin is a signal to the laptop of some kind and without it the laptop does not see the PSU as present.
I just bought a new PSU from the net and though it is outputting the correct voltage I think the signal may be wrong.
The circuit below shows how the signal wire is connected through a small circuit from the output of the PSU but I can't figure out what its supposed to be doing, so I can't tell if the signal is OK!
Can anyone explain to me what the circuit does and what it should be outputting so I can check it?
Thanks Al