My toshiba laptop keeps shutting down only when plugged in to the a/c i have a 305-6853. no overheating works fine if running of the battery alone

Identification

• Computer shops say that up to 20 percent of Toshiba laptops brought in for repair have issues with overheating. Symptoms may be as simple as the keyboard and bottom of the laptop being very hot while the computer is working, or the fans running at maximum rotation while the system becomes very slow for several minutes at a time. More inconvenient issues are common, such as the system completely seizing up and having to be "killed" with the battery pulled out, or the computer may shut down all by itself with no warning. Sometimes the laptop works fine until the user starts any significant memory-demanding applications, like photo editing software, several Internet windows being open at the same time, or an Internet video stream.
  

Significance

• A common problem with the Toshiba laptop is that dust becomes clogged between the cooling fan and the heatsink, a device which lowers the temperature by dissipating heat into the surrounding air. Now heat produced by the processor is trapped inside the laptop, and the fan cannot blow it out.
  

Take the battery out & see if it works then, perhaps the battery is so flat it is holding down the PC. It will should go on just the adapter. If this works, then you will have to plug battery back in, & adapter and leave alone for at least 8 hours. If it still won't work, you may need a new battery.

Computers may not be smarter than people, but if they’re designed properly, they will shut themselves down before overheating to the extent that they do themselves damage.

If the smart person keeps turning the notebook back on and figures out a way to foil the protection, the laptop is probably doomed. Once a laptop shuts down for thermal event protection, it may refuse to power back up for a fixed period of time, five or ten minutes, or it may begin to boot and shut down immediately as soon as it boots to the point that it can figure out that its too hot.

The over-temperature protection is generally a BIOS rather than an operating system function, so one sign of an overheated laptop is one that shuts itself down while you’re using it and then refuses to boot as far as the operating system unless you leave it alone for an hour or so to cool down.

Unless you’ve been working in a very unfriendly environment, high temperatures, direct sunlight, etc, you should take even a single overheating shutdown as a warning to back up your data at the first opportunity and to give the cooling system a serious cleaning.
Good luck

The cpu get overheated and will shtdown to protect it. The fan continues to run until a CPU safe temperature is reached / sustained.

1. Use laptop on flat surface, not on pillow, carpet, bed, etc. that will restrict air flow. Using a can of compressed air, clear the air vents.

2. If the symptom continues, then the heat conductive paste between the cpu chip and the heatsink is no longer effective (hardened, too thin, etc.). Remove the heatsink and add thermal paste
($6 Radio Shack).

Hi..

Laptop shuts down? Computers may not be smarter than people, but if they’re designed properly, they will shut themselves down before overheating to the extent that they do themselves damage. If the smart person keeps turning the notebook back on and figures out a way to foil the protection, the laptop is probably doomed. Once a laptop shuts down for thermal event protection, it may refuse to power back up for a fixed period of time, five or ten minutes, or it may begin to boot and shut down immediately as soon as it boots to the point that it can figure out that its too hot. The over-temperature protection is generally a BIOS rather than an operating system function, so one sign of an overheated laptop is one that shuts itself down while you’re using it and then refuses to boot as far as the operating system unless you leave it alone for an hour or so to cool down. Unless you’ve been working in a very unfriendly environment, high temperatures, direct sunlight, etc, you should take even a single overheating shutdown as a warning to back up your data at the first opportunity and to give the cooling system a serious cleaning. Hot spot, fan always runs? Many laptop brands and models have characteristic hot spots, like a particular corner of the keyboard or over the battery compartment. Before proceeding with the more invasive cleaning techniques that involve opening up the laptop (and potentially breaking something), spend some time searching the web for user feedback on your make and model. The bothersome hot spot on your laptop that none of your friends or colleagues have ever hear of may be a characteristic issue with your particular model and not worth a major panic.Similarly, if the fan always runs, or almost always runs, it may be a characteristic of the particular model that it simply gets hot in normal operation, or the fan control software might be poorly conceived. As long as the laptop isn’t overheating, I’d probably learn to live with a fan that seems to run too much if it’s typical for the model, and only get worried when I don’t hear it anymore.


Regards

PCmania

Check to see if the cooling fan is working properly. You should hear it running if you put your ears close when the computer is on. If the fan is working and the cause of overheating is not the fan, then you may have a deffective battery, check to see that the battery can take up charge. If the battery is fine, then you may have a chip inside the computer that is overheating because of internal defect. This job would be best left for experts.

It is obvious that your computer shutdown because it is overheating. try to get a chill mat to place it under computer. you said that it does not shut down when is on battery??? do you play games when is on battery?....computers normally overheat during large processing tasks such us playing video games. Try to fans clear do not place your laptop ontop of your bed or anything that will obstruct the fan under computer.

See if that works

best luck

Check that the AC power works, go to a repair shop and test a different one or have voltages checked with a multimeter.

If the AC adapter is fine, then it is usuall because AC socket solder joints on laptop are broken. In this case , it is a delicate repair, and must be done by an expert repairman.

if fan is working well then it might have processor problem.

I started having the same problem and worse mine would shut off without warning either from the battery running down or even just plugged in without a battery.

I thought It might be overheating so I got a can of air and cleaned all of the vents...and downloaded core temp to monitor the cpu temp @ http://www.alcpu.com/CoreTemp/. Same problem shut down and no charging even though it was running cool.

Finally I started changing settings and it seems to be working and charging just fine.

Here's the answer:
1. Set your power scheme to balanced
2. Open Toshiba Assistant from start
3. In Toshiba Assistant open CPU tab and set to low power.
4. When asked "restart now?" say no and shut it down using the start menu.
When you start it back up you will see the change.

Changing either one of these settings brings the problems back. I can't explain it.

I HOPE IT WORKS FOR YOU!

I just can't afford another laptop right now.

P.S. even at low power my system works fine...It's a little slower @ start-up but otherwise good.