Toshiba Laptop screen freeze when on Power AC

Toshiba / Satellite m200
March 2, 2010 at 21:09:23
Specs: Microsoft Windows Vista Home Basic, 1.729 GHz / 2037 MB
This thing is driving me nuts...
When my laptop is running on battery, everything seems ok. When I connect the external power supply, the screen gets garbled and freezes. But if I am in safe mode, this does not happen.
I have tried restore points, updating Vista, running various diagnostics, and everything indicates system ok.
I openend up the laptop completely, cleaned all the boards, fan etc, still no love.
Voltage on power supply is 19.3 or so (spec is 19v), so I think no problem there. I am not sure if there are spikes in the power supply unit or if there is ripple voltage. Besides, isn't it supposed to be a switching mode PSU...
THis has been a progressive failure. Initially (several months back), the laptop screen would get garbled (and system freeze) after about an average of 45 minutes of operation in normal mode (not safe mode). Then this time reduced gradually over 2 months to almost instantaneous freezing when main supply is connected. Have tried using external monitor, still the same issue.
The only way I can now use the external power supply is when running in safe mode.
Somebody, please help me (on my knees now).

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#1
March 3, 2010 at 13:08:29
Don't know if it would help, but it would be interesting to see what it does on AC with the battery removed?

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#2
March 3, 2010 at 18:06:12
Thanks for the suggestion, aegis1.
Same thing. Tried various combination...with battery, without battery, only battery, only AC, external monitor with just battery, external monitor with just AC, external monitor with both, unplugging AC and battery in various combination.
What can it be????????
This has been a progressive failure.

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#3
March 4, 2010 at 19:50:37
Is it possibe that there is a leak to ground, or some RF noise from the AC plugin point on the laptop.?

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Related Solutions

#4
September 7, 2010 at 19:46:37
Did you ever find a solution to this issue?? I bought a new laptop about a month ago and it seems that I am having the same issue. Before it used to last about 45 minutes before freezing but now it only lasts about 5 minutes, it is very frustrating!

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#5
September 7, 2010 at 20:37:22
Answer is in the Toshiba laptop forum. Link is below. My issue got fixed.
Safe Mode---->Device manager---->disable for 'Processors' driver (both for dual CPU)--->Reboot
http://laptopforums.toshiba.com/t5/...
good luck!!!

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#6
October 5, 2010 at 06:37:38
@ altorian: thank you so much! my laptop is now okay..

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#7
October 5, 2010 at 08:10:22
good for you dude!
However, remember, the marriage is gonna last for just a few months. After that, things are gonna get rough...but there are enough posts on the Toshiba forums that have started discussing this issue (post-fix).
good luck...you're gonna need it....

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