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  #1  
Old 25-03-2009
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Join Date: Mar 2009
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ohmy USB port delivers too much power

I've recently bought a new mobile phone over the net. When I put it to my computer via the USB cable the phone starts to heat and burn So together .. Now the company claims that the USB port delivers too much power. Is it possible? And how I am fixing it so it does not do so?
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  #2  
Old 25-03-2009
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Re: USB port delivers too much power

Have you previously used the same USB port for other things? If so, they should also have been burned, and therefore the USB port cannot be the problem.

It SHOULD not be possible for a USB port gives too much power, but you must of course get a volt meter and measure how many volts it delivers.
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  #3  
Old 25-03-2009
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Re: USB port delivers too much power

I have not used like the port to any other things other than my mouse and webcam. But have no problems with the other devices, where both the mouse and webcam is working fine.
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  #4  
Old 25-03-2009
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Re: USB port delivers too much power

USB outputs 5V supply up to 500mA (and only 400mA). Rechargeable batteries burn, if not control electronics (on the phone!) Shall have power to regulate.

USB port has no idea what the equipment connected. From mouse pulling micro ampere to 'flat' mp3 players pulling, perhaps, 200mA.

The only USB port to do is restrict the flow to 0.5 A/5V = 2.5 W.
Otherwise, your computer's PSU threatened to burn them.
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  #5  
Old 25-03-2009
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Re: USB port delivers too much power

Immediately I thought it also sounded a little strange when he said it. But it is obvious, because if it is so obviously not true guarantee. But if I measure with such a volt meter, what should it display normally?
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  #6  
Old 25-03-2009
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Re: USB port delivers too much power

If your coffee maker burns in flames when you first turn it on and the seller afterwards claims that you have connected the two phases (380V) - would you accept it? no doubt

The 5V meter you have between the extremes of the 4 contacts in the USB connector (red and black wire).
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