A bad connection between DC-IN power jack on the system board and the system board is a very common problem with Toshiba Satellite M35X and Toshiba Satellite A70/A75 notebooks. If your laptop is out of warranty, then you can fix the problem by resoldering DC-IN jack on the system board. If it’s still under warranty, it would be fixed at no charge to you.

Problem symptoms:

  1. Laptop randomly shuts down without any warning.
  2. Power LED and battery charge LED start flickering when you wiggle the power cord or the AC adapter tip on the back or your laptop.
  3. The battery will not get charged.
  4. When you plug AC adapter, the laptop appears to be dead and there is no LED activity at all (DC-IN jack on the system board is broken).

To fix the problem, you have to take your laptop apart, remove the system board to resoleder or replace the DC-IN jack.

Take a closer look at the power jack on the system board with a magnifying glass. In most cases you get the power problem because of a bad connection between the DC jack and the system board, you’ll see a crack between the DC jack connector and the system board.

Here is an example of Toshiba Satellite M35X power jack. The crack occurs between the DC jack pin and the system board.

Toshiba Satellite M35X DC in jack

Resolder Satellite M35X DC jack on the system board

In some cases the connection is good, but the DC jack is bad itself. You can find a new DC jack for Toshiba Satellite M35X and Toshiba Satellite A70/A75 laptops on eBay. Search for DC jack M35X or DC jack A75.

How to resolder power jack yourself.

UPDATE:

Sometimes, after you replace the jack, you can see that the system board doesn’t get power at all. The battery will not charge and the power LED will not light when you plug in the AC adapter. So, here’s a possible explanation.
When a connection between the positive pin and the motherboard breaks (cracks), the power jack gets loose. You can feel it when you plug in the adapter plug. A loose power jack can damage the trace inside the hole in the system board. Take a look at the picture.

Laptop Power Jack

As you see, the positive pin goes through the hole in the system board and you solder it on the top side. Right? What if the trace between the top side and the bottom side is broken somewhere inside the hole? I’ve seen it before a few times. In this case everything looks nice and clean on the top side. When you plug in the AC adapter, you get normal voltage readings between “+” and “-“ pins on the top side, but the power DOESN’T go to the motherboard at all, because there is no connection between the top and bottom sides. Test with a multimeter if there is a connection between the top and the bottom.
If the trace inside the hole is broken you still can fix it. You can run a wire to connect the top and the bottom sides. Be careful not to short something on the board.

Update:

Here’s another solution to fix the power jack problem, it shows how to relocate the power jack outside the laptop base. Check it out here: Toshiba Satellite A75 failed power jack workaround.

When you repair a loose power jack, it’s a good idea to check the jack on both sides of the motherboard. When you remove the top cover from a Toshiba Satellite A70/A75 laptop you can see only points where the jack is soldered to the motherboard as it shown on the second picture in this post, but you cannot see the jack itself as it shown on the first picture.
Removing the motherboard from Satellite A70/A75 laptop is a good idea because the jack itself might has a broken “+” pin, as it shown on the picture below. If the “+” broke off the base, you’ll have to replace the jack.
Power jack has a broken pin

 

UPDATE:

Today I received another well written and well documented guide about fixing Toshiba Satellite M35X power connector issue. This guide was submitted by Stephen Macuch. Thank you Stephen for great pictures and detailed instructions.

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686 Comments

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  1. 686
    CS Thampy Says:

    I have a Thoshiba laptop L300. It works well without connecting power code up to the backup time. If connect the power code then the laptop stuck or suddenly off or some scratch shades appearing on the screen and stop working.

  2. 685
    YY Says:

    I just repaired my neighbour’s A70 notebook with the power jack problem together with the pushed-in power button problem. I have a pretty good theory of WHY the power jack problem occurs. I found out that the solder joint at the positive pin has eroded away, leaving the whole power jack movable when pushing in and pulling out the power connector. I re-soldered the positive pin to the motherboard and thought that I had fixed the problem. I assembled the notebook and when I attached the power input the A/C D/C adaptor beeped, indicating a short-circuit. I took the motherboard out again to examine and found out that because of my amateur soldering technique, I had made a bigger ball of solder than most professionals the it touched a metal part of the top cover when the top cover was put back on top of the motherboard and caused the short circuit. The ball of solder showed a flat surface at one side of the spherical ball of solder indicating the electric arc caused high temperature which melted the solder while short-circuiting. So I used the solder gun to remove a little bit of the solder ball and re-assemble the notebook and it worked. I accidentally discovered the reason why so many other users had the same problem. The close vicinity of the positive pin solder to the metal part of the top cover caused electric arc to jump continuously or occasionally across the air to cause high heat which melted the solder. I then took the notebook apart again and use electric insulating tape to cover the soldered area of the power jack, hopefully will avoid the electric arc to happen. Hope this information helps. As for the pushed-back power button issue, I used super glue to attach the top rectangular part of the button to the back of the top cover and it worked perfectly.

  3. 684
    jooo Says:

    1)my toshiba l755 it was shut down in unexpected ,but not every time, around 10%.(mostly on start up the window(98%)).i thought it hv some loose bits on my adapter,so i put on my battery. but it was still happening !! but not much(5%).

    2)my lp was automatically start window when i open the lid(90%).it’s not window resume,it’s really start up after i turn off.

    all in normal condition(even thought the problem happened)

    power led-light up but no blink.(light off when it’s turn off or automatically shut down)

    battery led-light up but no blink.

    adapter led-light up but no blink.

  4. 683
    simba Says:

    my toshiba L300 laptop will not display anything when power adapter is connected, but has no problem when working from battery, what do i do

  5. 682
    cj2600 Says:

    @ Gia,

    The difference with my machine is that it charges when powered down, but if the PSU is connected when booting it can shut down and then reboot itself. This can also happen at random intervals after / if I get to login to Windows. Then it seems to happen in a loop – SHUTDOWN/ RESTART/ SHUTDOWN/ RESTART/ LOGIN/ SHUTDOWN/ RESTART etc etc.

    Seems to run without a problem on battery itself.
    Is this more than likely an issue with the power supply also?

    Here’s something to try.
    Remove the battery and start the laptop just from AC adapter.
    Now wiggle the power plug inside the socket. Does it shut down when you wiggle the plug?
    If yes, it could be a problem with the DC jack.

  6. 681
    Gia Says:

    I have the same problem as post #730.
    The difference with my machine is that it charges when powered down, but if the PSU is connected when booting it can shut down and then reboot itself. This can also happen at random intervals after / if I get to login to Windows. Then it seems to happen in a loop – SHUTDOWN/ RESTART/ SHUTDOWN/ RESTART/ LOGIN/ SHUTDOWN/ RESTART etc etc.

    Seems to run without a problem on battery itself.
    Is this more than likely an issue with the power supply also?

  7. 680
    cj2600 Says:

    @ steg,

    Could we hardwire the power brick to the board?

    Probably you can try this trick:
    http://www.laptoprepair101.com.....orkaround/

    Say for example if I wanted to “convert” the laptop to a tablet and mount in my kitchen?

    What do you mean by “convert” to a tablet?

  8. 679
    steg Says:

    My Toshiba has been dead 3-4 years now with this precise issue.
    I tried new battery, new power brick…nothing.
    I work at a company that builds desktops and pcbs, and had a tech follow the instructions. He got the laptop working for about a month before I had the same failure reappear.
    I hate to toss out a laptop where everything works.
    Could we hardwire the power brick to the board? Say for example if I wanted to “convert” the laptop to a tablet and mount in my kitchen? Or any ideas at alternate uses besides scrap?

  9. 678
    Dylan Caamano Says:

    You guy’s (I mean that about the females also Just my way of talking)are lifesavers and your solotions are right on THANK YOU
    If I wasn’t disabled and surviving on a $480.00 check for s month I would definitlly Donate and will in future when i run into some xtra cash this is not somthing I will forget about as if I didn’t get the LapTop fixed I would be out in the street due to power adapter broke on my freinds computer when I was useing it.To all the people who ain’t livin on peanuts these guy’s deserve a cash bump. just my opinion though.

    Thanks You Very Much
    Mr Dylan D Caamano

  10. 677
    cj2600 Says:

    @ nash,

    why take it apart ?1 all what you have to do is make a USb connection using a the male part and cut the tip from the adapter.
    connect the red + black in the usb cable to the white and black in the adapter. keep in mind to keep not to cut both shot just in case you want to change your mind and want the adapter tip again.

    I have no idea what you are talking about!

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