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Can I power my laptop through th usb port

The dc power socket on my laptop top is loose, so power cuts off ever so often. My battery needs replacing. Is the any other way I could power my laptop either through the usb port or a additional battery that can be charged independent of the laptop. Would appreciate your comments.

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  • Anonymous Dec 05, 2008

    I was wondering this too.

  • Anonymous Dec 21, 2008

    same problem


  • Anonymous Jan 21, 2009

    my toshiba laptop has power problem battery is out of order new one is very costly so i want another way to power my laptop

  • bertandernie Mar 18, 2009

    same problem...... there must be a way to do this??????

  • Anonymous Apr 28, 2009

    Looking for a USB to power my Toshiba Satellite (17") laptop.

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I know you've either fixed your problem, or thrown the laptop out(still a "fix") but for posterity, and for anyone with a similar problem...

There are two answers, depending on your laptop.

First, NO, there is currently no way to charge your laptop battery by putting power into the usb port.

There ARE commercial external batteries. sadly, they will connect to your failing power-socket.(see http://www.laptop-battery.org/Power/External-Batteries/ENB003L.html)

If your laptop has a external battery charging dock, for spare batteries.... you could go that route.
you'd probably still want to follow the last suggestion.

GET IT FIXED!
Seriously... anyone with fairly good soldering skills can probably fix that powerjack. It probably pulled/pushed the traces off the main board and will require superglue, solder, and maybe a bit of fine wire, to fix. The biggest obstacle will be the dissassembly, and proper reassembly of the laptop case. It'll take a while, but once fixed, should return your laptop to 100% functionality.

I have saved 3-4 laptops with this technique. One, I even swapped the power jack to a more common size. This was to allow the use of a non-proprietary power brick(the original had fried itself).

Posted on Jun 18, 2009

  • ironsmiter Aug 21, 2014

    I will have to recommend AGAINST even TRYING this. even if you DID somehow circumvent the diodes in the USB circuit(the little electronic critters that only allow electricity to flow one way), and the design engineers were batty...you would STILL ony be able to input 500mAh at 5 volt DC before the usb control chip lets out it's magic smoke, and now you no longer have power OR usb.

  • ironsmiter Aug 21, 2014

    sorry, that reply was in response to spookysr and their attempt to force a male-male usb cable to charge. Now, there IS an upate, so my answer has changed. USB 3.0 SuperSpeed has changed the game when it comes to usb charging. USB 3 SS is able to handle significantly more power, and THERE IS A PROVISION in the protocol for dual-role usb ports. meaning if you have a USB3ss port on your computer(or powered hub) AND your laptop has a USB3 dual purpose port then you CAN now charge over the usb port, but this will be clearly stated in your laptop's manual. Other "normal" usb3SS ports STILL will not charge your battery, only the one dual purpose port specified by the manufacturer. In a less practical application, a person COULD take a USB 3.0 Standard-A receptacle, swap it out for a standard usb port, but wire it only to the charging circuitry as long as the normal power supply is 12 volt(60 watt) or 20 volt(100watt). and if you REALLY don't care about your electronics, or are really good(in which case, you already know this), you technically could wire a usb3.1 port as a power input AND usb2 port. Since the charging power comes from the usb3.1 extra 4 pins, theremaining 4 usb2 pins could be CAREFULLY wired back into the stock control hub. Really good electrical isolation for the power wires will be required, and by this point, you are probably better off just repairing the power jack anyway. But it CAN be done. Refer to the Universal Serial Bus Power Delivery Specification pdf for relevant information on getting it done. Also note, you will have to get a proper USBType-C1.0 passive cable to force the charge rate from usb3.1 host controller. And at this point, I bet you wish you had just paid that nice computer shop the $50 to repair your power jack :-)

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I don't recommed doing this but technically you can power SOME laptops via their USB port. However, you can NOT charge the battery this way. You will need the ENDURANCE car battery booster box with USB function. You will need a MALE to MALE Type A USB cable - only available on Internet - RadioShack et al does NOT sell them. I do NOT know what will happen. Not even sure the power switch will control it either. May come on as soon as you plug it in I don't know. I think this method bypass the internal power conditioning circuitry so It has to be a battery which is more stable than power mains..Some manufacturers say don't do it but I think it will work as the USB power circuit is connected to main power bus of laptop. Your internal digital cicruitry, display, and drives actually only require 5VDC not 12-19V which is stepped down internally to 5V. The ENDURANCE box has enough current to handle the laptop's current requirements. I ordered my USB cable today and will try this on two busted laptops I have. Good luck!

Posted on Sep 07, 2009

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I can suggest to try to put out old power socket and buy a new one
if you can do it pay attention to respect the polarity of older socket
that will be + to +  and - to - - i think it is not difficult- delfo

Posted on Mar 22, 2008

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Best and cheapest solution I have found which doesn't cost all that much was just to buy a replacement power adapter off Amazon. If you can stomach the 3-5 day wait, in the long run you won't ruin your laptop, you won't over amp your circuit board--which is a death sentence and i got mine for $19.95 US Dollars. It works great and notice no difference between that and the original that came with the laptop that they want $99 at Radio Shack or $119 at Toshiba...so there you go!

Posted on Jan 10, 2010

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is just as good of an answer as any other answer here in regards to the question that was asked. the person didn't ask how to replace the charging socket, or where to buy any OE replacement part. they simply asked if you can turn on and then keep the laptop powered through the usb port (which would be nice if someone has a solution considering we have "always on" usb ports now and the old excuse was that there wasn't voltage to usb when it was off...") OR is there an adapter to charge a laptop battery independently from the laptop (which there are but usually expensive, mostly found only in the corporate world, and are made to charge a "battery" of batteries at once, lol) you could maybe find your batteries pinout schematic and make a cable for the battery itself, but i'm sure that's way more complicated compared to just plugging a usb cable and power cord in.

Posted on Oct 30, 2013

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Posted on Sep 09, 2008

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When you connect the power adapter into the laptop, does the power LED light up? If not then -
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Check power adapter's DC plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced.
If the adapter is OK then connect it to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard.
This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first.

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When you connect the power adapter into the laptop, does the power LED light up? If not then - The battery adapter or the adapter's power lead or the laptop's power socket could be faulty. Check power adapter's DC plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced. If the adapter is OK then connect it to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard. This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first.

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When you connect the power adapter into the laptop, does the power LED light up? If not then - The battery adapter or the adapter's power lead or the laptop's power socket could be faulty. Check power adapter's DC plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced. If the adapter is OK then connect it to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard. This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first. http://www.fixya.com/support/r4799950-laptop_battery_power_supply_problems

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Hi,


Im very sorry to hear that, please follow these simple steps for you to be able to isolate the exact problem.


1. Removed the battery.
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3. Turn on the laptop. If the laptop is able to power on, that means that the AC adapter is working fine as well as the DC port. If the laptop is not able to turn on, it maybe the AC adapter itself or the DC port.
4. Try to use another AC adapter if possible, make sure that that AC adapter is working fine. If the laptop is still not turning on, the problem is with the DC port itself. In that case, you will need to replaced the Motherboard itself.


Hope this will help...Thank you for using Fixya...

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d600a.jpg?w=300&h=258
The Dell Precision M20 Battery stops charging when I move the power cord on the DC adapter. When I start moving the cord left to right, the power LED light on the front goes on and off and the battery charge LED goes on and off too.
dell-precision-m20.jpg?w=300&h=225
I removed the precision m20 battery and tested the laptop again. The laptop starts fine from the DC adapter when the battery is removed, but as soon as I start moving the power cord the laptop shuts off. It looks like the laptop looses power immediately.
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In order to access the power socket I had to disassemble the laptop and remove the top cover assembly with the display.
You can find disassembly instructions for many HP, Dell, IBM, Lenovo, Sony and Toshiba laptops in these service manuals and guides.
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