I'm not getting any power to my laptop, checked everything, what's wrong?

Question

I have a laptop which is dead. Batteries were tested and all 3 are OK, the CMOS battery, the Resume battery and the rechargeable battery. Took laptop apart carefully and near where the ac adaptopr plugs into the motherboard are 3 small cyliners which look like transformers, not resistors, inductors or capacitors. Anyway, the tops of one of these is all blackened and melted, and another one which is only discoloured brown on the outside, the other 2 are also discoloured brown with some of the paper actually melted and blackened. Could these things be the cause of the motherboard not coming to life? I took our the batteries for over a day as could not find a jumper or 2 solder points to release the CMOS I have uploaded a digital picture of all this at www.sideporchwindows.com/burnedout.html if you could have a look there and let me know what you think.

Regards.

Angie

PS: have done all the usual stuff like check other components, hard drive, ram etc. which all test to be fine.

Answer

This question was answered on January 19, 2004. Much of the information contained herein may have changed since posting.

Without seeing an electrical schematic of the laptop in question, it appears that the cylinders (which look like tranformers or coils) are indeed burnt and possibly could be one of many problems with the laptop You mentioned that the laptop is still dead even with good batteries which leads me to think that you have more problems Before you invest any more time or money into this laptop, you may wnat to think about a professional evaluation from a repair shop.

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Author

Posted by Student of Katharine Gibbs School - New York on January 19, 2004