Question about Toshiba Satellite P15-S479 Notebook

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Faulty DC power connector

DC power connector on laptop has bad solder joint? Must apply upward pressure on the power connector for operation. Problem is not the DC supply side.

How do I safely open the back of the PC to inspect?. If it is a bad solder joint I am qualified to repair.

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  • Bob Marquart
    Bob Marquart Dec 28, 2007


    I will attempt this in a few days. The PC also has a failed display and needs OS re-install. Not worth the $100 for a shop to replace the connector. If I can repair I will have a decent desktop for my son. If I fail, not much is lost. Will let you know if I am successful.



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This website may help you with the disassembly/reassembly.

I've done a number of these repairs, but not on Toshiba's.

When the power connector becomes loose it can cause over heating which can damage the system board. On a couple of the laptops I fixed the damage was so bad that I did not replace the connector. Instead, I soldered wire and made a "pigtail" by using a female connector I purchased that mated with the power supply. I put shrinkwrap over the wire and zip tied the connector to the back of the laptop. It's not as pretty as the original solution, but it takes all the stress off the system board.

Good luck.

Posted on Dec 28, 2007

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First pulling a machine apart takes time and careful disassembly - it is easy to snap off fragile plastic panels or rip cables and replacement parts can easily cost as much as paying someone to disassemble it for you. Usually a jack repair is $100-$150 depending on the shop.

Toshiba's are a multilayered setup - You have to remove all the screws from the bottom (note that they are labeled by screw length next to each hole - do NOT put the wrong length in when reassembling!!) Make sure to remove the hard drive and ram cover and check for screws there are well.

After all the screws are out of the bottom, remove the panel above the keyboard. Remove the keyboard and all the screws under the keyboard. Then you can get at the motherboard and power jack.

You will probably have to remove the motherboard to replace the jack - Usually the mounting screws for the motherboard are not so clearly labeled - i mark the holes with a sharpie when pulling a mainboard.

Good luck!

Posted on Dec 28, 2007


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It is possible it is a bad battery again. Also could be a bad solder joint on the DC jack or bad AC adapter. To test power off and unplug the laptop, remove the battery. Now plug in the AC and power on the PC. If it comes on, gently wiggle the AC plug going into the PC. If it shuts off you have a bad DC jack solder joint. If it stays on the battery is probably bad or the battery connector on the PC. If the PC doesn't come on at all with just the AC gently wiggle the AC plug and tap the power button repeatedly. If it comes on briefly than off again it is the jack solder joint. If it doesn't come on at all then it's a safe bet the AC adapter is bad.

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Why wont battery charge on laptop

A) The Battery is old, and beyond charging

B) The AC adapter (Charger) may be bad, and/or one of it's cables may be bad. If there is no one to test it with a multimeter, take it to a computer repair shop, and have it tested.

If bad suggest you look around at prices on the internet, before buying one from the repair shop. (If offered)

C) The port on the laptop, that the AC adapter (Charger) plugs into, is the DC Power Jack. (May be labeled as DC IN )

This jack may be soldered directly to the motherboard, in the laptop, or is attached to a cable which plugs into the motherboard.

For the style that is soldered directly to the motherboard, it's solder connections may have received damage.
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Bad connection caused by cracked solder joints, could = no power to battery. (Even though the laptop May be receiving power)

If laptop operates fine on the AC adapter, but the Battery will not charge, the problem may be a power sensor chipset, on the motherboard. May require replacement of the motherboard.

{ This chipset senses;
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When i press the power button on the nw8440 the charging light just flick several times but it does not start

Chances are, you have a bad motherboard. You can try one thing. In my experience, it works about 10% of the time.
Unplug the power cable from the laptop. Remove the battery. Press and hold the Power button on the laptop for 30 seconds (This will drain the power from all components). Put the battery back in the laptop. Connect the power cable. Try to turn it on. Again, in my experience, it works seldomly (I promise I've seen it work several times, though).
If that doesn't correct your issue, you may have a DC jack which has solder joints broken. If your laptop charges "sometimes" but not others, this is probably you. The DC Jack is the component inside of your laptop which the power cable plugs into. Over time, whether you do as much as trip over the cable down to just laying the laptop on your bed (it will sink down and put pressure on the DC jack/power cable), the DC jack may have wiggles itself free of the solder joints holding it to the motherboard. This is not a cheap repair.You can test this by giving SLIGHT upward pressure to the power cable at about an inch away from the edge of the computer. Keep an eye on the front LEDs. If no other LEDs light up, then you probably have a bad power cable. If, when gently pressing up on the power cable, you get an LED to turn ON, then you have a bad DC jack.
In either case, the only fix is to take the PC to a computer repair shop.
I hope this helps and thank you for using

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So how is the DC Power Jack solder joints on that Fujitsu Lifebook?

The DC Power Jack (DC IN) is the jack on the laptop where the AC adapter (Charger) plugs into.

Do any of them look oxidized?
Dull finish on any of the solder joints holding the DC Power Jack to the motherboard.

De-solder and makes fresh solder joints.

Are any of the solder joints cracked?
Cracked at the area of the solder joints to the bottom of the motherboard.

What condition is the DC Power Jack itself?
Physical condition of the jack.
Bad physical condition requires replacing.

Do you see any discoloration, or burn spots on the chips on the motherboard?
(I.C., Integrated Circuit = Chip and Chipset)

There is a sensor chip on the motherboard for power. Senses when the battery needs to be charged, or doesn't, and when the laptop is to just use the AC adapter power.

If so replace the motherboard.

Post any questions about the above in a Comment.
(Believe upper right of your page > Comment)


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Hello. I have seen this happen with all models of laptops. Too bad Apple has a patent on that magnetic power cord they use...

You can find all of the service and user manuals for your Gateway laptop here...

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