bigal_scorpio
Active Member
Hi to all,
I just found a strange fault with a batch of SMPS for laptop computers that we had delivered!
We ordered 20 of them, they are the type that has switchable 12v to 24v output at 3.75A(24v) and 2 USB power outputs. They are model number SC-9049LED.
The problem is that they will unerringly power up most laptops without any problem, windows will load perfectly and any program that you care to use will function OK. But!!!!!!!! The mouse will not work correctly, it will not move about the screen as it should and instead jerks and sticks randomly so badly that it is unusable.
This effects the touchpad, ministick pointer or indeed external USB mouse, infact anything that moves the mouse pointer is affected! On ANY laptop!
How can a PSU be stable enough to power up the laptop perfectly every time yet fail to enable the mouse to move correctly?
This problem is definately the PSU causing it and they are all the same from this batch but if one from another batch or the laptops original supply is used the mouse will work OK! Anyone got the answer to this puzzle?
BTW I have had the scope on the ouput of a few of these and there are no spikes or dips apparent whatsoever. A pure straight trace within 1% of the set voltage.
Bet I have you all puzzled with this one!![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Regards.........Al
I just found a strange fault with a batch of SMPS for laptop computers that we had delivered!
We ordered 20 of them, they are the type that has switchable 12v to 24v output at 3.75A(24v) and 2 USB power outputs. They are model number SC-9049LED.
The problem is that they will unerringly power up most laptops without any problem, windows will load perfectly and any program that you care to use will function OK. But!!!!!!!! The mouse will not work correctly, it will not move about the screen as it should and instead jerks and sticks randomly so badly that it is unusable.
This effects the touchpad, ministick pointer or indeed external USB mouse, infact anything that moves the mouse pointer is affected! On ANY laptop!
How can a PSU be stable enough to power up the laptop perfectly every time yet fail to enable the mouse to move correctly?
This problem is definately the PSU causing it and they are all the same from this batch but if one from another batch or the laptops original supply is used the mouse will work OK! Anyone got the answer to this puzzle?
BTW I have had the scope on the ouput of a few of these and there are no spikes or dips apparent whatsoever. A pure straight trace within 1% of the set voltage.
Bet I have you all puzzled with this one!
Regards.........Al