My old Dell 5100 laptop took a spike during an electricl storm a couple of months ago, then it wouldn't power up.

I took it apart today, and found a smokey (burnt) looking 4RT inductor.
Believe it or not, I have a spare, in my salvaged parts box.

Question, is there a + / - side when mounting?

The lettering on the old one, and consiquently the mounting pads, don't go the same way as on the new one. The old one is East-West lettering, as mounted on the MB, and the new one is North-South lettering.

Thanks for any feedback, or for steeing me in the right direction.

Gary

 

No polarity on an inductor.

FIRE AT WILL

 

I think the inductors are wound the dropped into a bin then, at the next station, the part number is stenciled or printed on them (no need to be consistent in the orientation).

 

Thanks,
Gary

 

That's true as long as it has only two connections.

 

It did (have 2), and I did get it mounted,
Sadly, it didn't fix the laptop.

I'm not that good at troubleshooting Laptops.

But hey, it's all good.

I learned something new today, and I got to tinker for a few hours in the garage.
It was nice, 65ish, and sunshine.

Thanks again,
Gary

 

The inductor can cook if the freewheel diode is shorted. Check the diode that connects to the inductor.