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:
- Laptop randomly shuts down without any warning.
- 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.
- The battery will not get charged.
- 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. Toshiba Satellite M35X and Toshiba Satellite A70/A75 disassembly guides will help you to remove the system board. 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.
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 here. Search for DC jack M35X or DC jack A75.
How to resolder laptop 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.
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.
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.
If you are tired of fixing your laptop and want to sell it for parts you can do it here:
Any Notebook Part – free classifieds. Only laptop stuff.
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March 6th, 2008 at 10:22 pm
Bill Roadman,
Here I posted instructions for taking apart a Toshiba Satellite A15 laptop. You don’t have to solder anything because the phone jack is attached to a cable and this cable simply plugs into the motherboard. You can see it on the step 22.
You can find a new phone jack with the cable if you search by this part number: P000379300
March 1st, 2008 at 4:04 am
My TOSHIBA Satellite A15 PSA10U-28RJRV has a short in the dial up telephone female plug. About half of the time I have to unplug and replug the phone wire to complete the circuit and connect. Can I remove the case and solder a new connector on the board. It looks like I would have to remove all the case screws and the whole bottom of the case.
February 29th, 2008 at 4:51 pm
Can someone tell me how to replace a toshiba satelline A35-S159 loptop cooling fan, I recently purchased a new one and I cannot replace it.
I need instructions.
Thank you,
NINA
February 26th, 2008 at 9:35 pm
i’m gonna leave a pretty indepth question as to hopefully receieve a pretty in depth answer. have a toshiba satellite m35x laptop that had the dc jack problem. it would only work on battery power. you could plug it into ac power as long as the computer was turned off so that the battery could charge, but you could not use it with ac power plugged in as it would freeze. so we would charge battery with it off, unplug, then use computer till battery died or etc. bought new dc jack, unsoldered old, soldered new in. reassembled laptop (i had done it 3 times by now) as perfect as possible, turned it on for moment of truth, and nothing. well, cpu fan would kick on, 3 lights on front showing power was plugged in was on and charging, blue light on power button was on, but nothing. no video. no power to cd tray. hard drive didnt spin up. nothing. just the cpu fan for a few seconds and those lights. took it apart 3 more times to be totally sure evertything was seated right and etc. still nothing. same thing. the only thing that i can come up with is maybe i fried the motherboard or something somehow when i soldered. i used anti-static band properly. but maybe i didnt solder properly. can anyone give any tips or suggestions on how to troubleshoot this or anything at all? thank you.
February 24th, 2008 at 12:28 pm
OK…so I took my laptop apart today and pulled the motherboard.
The power jack seems fine…I did a continuity test across the positive pin and the MB..tested good. Also did the same for the Negative terninal..tested good.
I also noticed that if I tested across the negative to the ones on the sides..I get continuity..
My question then, is what does all this mean?
Is my dc jack OK?
February 23rd, 2008 at 6:23 pm
I need to know if the two terminals on the side are needed…I am going to try to do the workaround solution and I am not sure if those terminals are just for support or are they part of the electrical connection.
this is on a M35X
thanks
February 21st, 2008 at 5:38 am
Joan Glover,
Read valued comments at the end of this power jack workaround article.
One guy replace the factory power jack with a generic one from RadioShack and it looks great. Maybe that’s the way to go this time?
February 20th, 2008 at 9:20 am
Thank for the info! My Toshiba laptop has been nothing but trouble. The power jack has failed three times. I have just ordered my fourth power jack from eBay. I am hoping that the new and improved jack solves the problem.
February 16th, 2008 at 9:02 am
Oops! It should have read
I purchased the ext. warranty from circuit city and have had to have the MB “REPLACED” once for the DC problem dec 05 with the original warr. and once more in nov 07
February 16th, 2008 at 8:39 am
I also have a M35x-S149 I purchased it Dec 2004. I purchased the ext. warranty from circuit city and have had to have the MB once for the DC problem dec 05 with the original warr. and once more in nov 07 when it wouldnt start, but the fans ran and id close the top and an hour later id realize it was booted! like some previous posts ,if I left it on it was ok! I am also on my 4th power cord these “replacement” cords the warranty company provides are junk and ive been waiting for a new one since dec 15! they just keep giving me the run around. Im determined to use this laptop till my ext warranty is over at the end of 2008. I will then get a new one (if I can come up with the $)and it WILL NOT be a toshiba or from circuit city (Im fed up with the ext warr. they offer!) Im thinking maybe HP