Toshiba Satellite M35X A75 power jack problem

posted in: Toshiba Problems | 686

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.


686 Responses

  1. I have the solution for the non booting Toshiba m35 that I wrote almost a year ago. This tutorial is applicable to laptops that shut down without any warning, laptops that turn on only sometimes, and laptops that simply refuse to turn on. So if your laptop does not turn on, it goes completely dead within a few minutes after bootup, here’s the link to the tutorial. The repair takes about an hour, there’s no need of replacing any parts, reinstalling any software or any other thing. The only investment in repairing your laptop with this tutorial is your time. Basically, you can repair your laptop within the hour, without spending any money for any parts or software.

  2. Douglas Lazarus,
    Remove the battery and start the laptop with the AC adapter. Now wiggle the power plug inside the jack. Will it shut down when you wiggle the adapter plug? If yes, it’s either DC jack problem or you have a damaged wire inside the cord.

  3. Ingrid,

    1. The Tech is now calling to advise after repairing the DC Connector he’s getting a “Cannot detect Hard Drive” and my HD is toast.
    2. Is it possible he either hasn’t reassembled correctly, or forgotten to return the the CPU to the locked position? He says it gets to the windows screen then he gets the error message.

    Hmmm, he said the hard drive is not detected by the laptop and at the same time it gets to the Winodws screen? Really strange. When the hard drive is toast, you will not see Windows screen at all.
    I cannot advice in this situation because I’m not really sure what’s going on with the laptop.

    Is it possible he either hasn’t reassembled correctly

    Yes, it’s possible.

    or forgotten to return the the CPU to the locked position?

    Nope, with unlocked CPU the laptop will not start at all.

  4. rollie,

    I resolder the pin and all the connections again but still the computer will not turn on. There is a fuse beside the power connector. I used my meter to test the voltage between the output side of the fuse and -voltage, I was reading 19+ volts dc. Any idea about what happened?

    Check the memory module, maybe it’s not seated correctly. Try reconnecting the memory module.

  5. I have a toshiba M35x. I resoldered the +pin and all the 3 leds turned on. I wiggled the plug , all the leds stayed on. While the laptop was booting, the screen went blank. I hit the on button to turn the computer back on but nothing happened. I resolder the pin and all the connections again but still the computer will not turn on. There is a fuse beside the power connector. I used my meter to test the voltage between the output side of the fuse and -voltage, I was reading 19+ volts dc. Any idea about what happened?

  6. Thanks to your site, I was able to ID the charging problem with my Toshiba A70. However knowing I don’t solder well, I decided to take it to an authorized Toshiba repair shop. The last time I had the unit running, I performed an orderly shutdown before the battery ran too low to prevent a crash. The Tech is now calling to advise after repairing the DC Connector he’s getting a “Cannot detect Hard Drive” and my HD is toast. The unit booted and ran fine before he opened it up to repair the DC connector, but since we couldn’t power up the unit when I left it with them, he say’s he doesn’t believe me. Is it possible he either hasn’t reassembled correctly, or forgotten to return the the CPU to the locked position? He says it gets to the windows screen then he gets the error message. Thanks

  7. Douglas Lazarus

    I have a Dell latitude 630. The battery power does nto last long. As it gets too low, I get a message that says Switch to Plug-in Power. But I only use the AC Adapter. It’s a fight between the battery going dead and getting recharged. If I take the battery out, I can use the computer on AC power, but it goes dead after a while. If I am using AC power and remove the adapter connection, it goes dead immediately andwon’t restart if I plug in the adapter without the “dead” battery installed.

    At first I put in a brand new battery, but had the same problem of it going dead with the message to switch to plug-in power.

    In Control Panel Power Options, I do not see a menu item that allows me to switch from battery to plug-n power.

    Can you please advise? Thank you very much.

  8. otto schulz

    the trace in the hole thru the board was bad so i soldered a jumper on to the wire coming out of the back of the plug and on to the hot side of the resistor feeding the trace that way

  9. drajat Imam m

    My notebokk c 8223 MV,
    If I press power button must be in charging, although batery 90 %. I need explanation..thank you very much

  10. I have a Toshiba A75 that will run on AC power until it has to think! I have loaded a new BIOS and Windows XP but the problem persists. It charges when it’s off and does not seem to have any “loose connection” issues. It will not boot up with the battery removed but once booted and dormant I can unplug and replug the AC adapter and it will begin to run on AC even if I remove the battery… until you run a program or in some way ask it to “think” then it reverts to the battery. Any ideas?

Leave a Reply