Dell monitor PSU vs Dell laptop PSU

[keepread]

Hi there!
Someone gave me their old monitor, it's Dell S2715ht.
The owner was using it when his PSU began to smell and then to smoke. It literally began to melt. He turned the monitor off, pulled the PSU, and ditched it because it was smelly even after it cooled. So I got the monitor but not the plug.
Now, I tried to bring the monitor back to life, by plugging one of my many Dell laptop PSUs. They are of the same 19.5V, and the wattage of the laptop PSU is higher than that which the monitor is rated for. Visually, the socket on the monitor seems compatible, and the plug plugs right in and feels normal, but the LED on the monitor does not light up nor does the monitor turn off when I touch the On symbol in the bottom right corner, hence the question:

Do Dell's monitor and laptop PSUs have the same plug, or do they have different diameter central pin? They could have different length pin as well. It looks like the laptop plug's pin sits very deep in the ground tube and may not reach far enough into the monitor's socket's central post.

I could take measurements if needed.

Regards
KR

[DynaxSC]

The question is why did the monitor PSU melt ? I would guess the monitor has just almost a short on the power supply inlet, and your laptop PSU might have an OC protection, contrary to the melted monitor PSU. However this is a probable reason, it must not be true, and the plug/inlet are not compatible, however I have not the right knowlege about this.

If you have the melted PSU you might transplant the plug from the melted PSU with a short part of the cable on the working PSU cable and see then if it works. Or just cut off the cable frm the melted PSU, connect it to a ajustable voltage Lab PSU, set 19.5V, and test the monitor and it's current draw. Current must not exceed nominal Monitor Maximum Power draw divided by 19.5V.

I'm also not sure, but DELL laptop PSU's might have also a simple digital interface communicating with laptop, so this might be the reason why it not works with a monitor, as monitors most probably miss such interface.

[keepread]

Meanwhile, I've gone over the manual and found out this:
Delta DA65NM111-00and Chicony HA65NS5-00 are the two compatible PSUs that Dell lists fo this monitor. They are generic for a line of various laptops as well. So they should have a compatible plug, and your assessment of the monitor's demise is likely spot-on.