What signal is sent over the center pin of the adapte pug?
As i found out on the internet my Dell x300 latitude cannot charge the
battery because i use another ''Dell'' adapter with the same ratings
though. The cause is the signal sent over the third pin by the original
adapter that tells the laptop to be able to charge the battery. My
question: is there anyone with the original adapter who can view this
signal on an oscilloscope? Maybe it is just a steady voltage that is
needed, maybe a complex digital code, maybe a simple one that can be
imitated by a simple circuit or even a tape recording. Anyone have any ideas about this?
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You can remove the BIOS password by removing the CMOS battery located inside your laptop and in the motherboard. Turn off your computer and remove the battery before opening the computer and remove all the screws at the back of your laptop to reveal the motherboard and remove the battery.
the problem is the BIOS of the Dell system is looking for an ID signal from the AC adapter so it knows what adapter is connected. If the BIOS cannot ID the power supply, then battery charger is disabled.
Does the battery accept a charge from the another laptop ?, the only way you will know if this is happening is to run the battery down till it warns the laptop it is failing and them plug it into the other machine
If the battery re-charges then it is fine, if not you need to replace it
If your machine works with the AC but the battery stays flat then you have a fault on the onboard circuit that trickle charges the battery and you need a techie
the problem isn't in the psu - it's in the laptop. The centre pin supplies a trigger voltage with a simple carrier which tell s the BIOS about the power characteristics of the unit. Missing that signal, the BIOS assumes that even though there may be enough power to run the laptop, there may not be enough to charge the battery - a situation that, on lower power PSUs, can lead to damage to PSU and/or laptop. That's a safety feature that it doesn't attempt to trigger the charging circuit. The most likely reason for that trigger being missing is the (very poorly-designed) PSU interface having become disconnected from the rail. The socket needs replacing.
First off, do you have a way to check the output of the ac adapter to ensure it's putting out the correct current?
If you've done that and have a multimeter handy, you can remove the battery, system off, and check the charge pins for current/voltage. I believe one of the end pins is neg (ground) and at least one of the other pins should show 2.6-3.6V, as well as other various voltages. If you fail to get any response at the charger pins, we'll need to look at the board circuitry, assuming again that the ac adapter is operating properly.