okay so here is a issue for anyone?? touchpad makes the screen go black

i have a customers system here. ive tried everything i can think of... but when i move the touchpad it causes the screen to go out? not the whole thing but just the backlighting for the screen... any idead. if i even touch the touchpad without moving it it goes out for a second then comes back on.. wth??

 

did you try reinstall the software?

 

The middle trackpoint button of my T400 makes my screen go blank only when clicking just it, briefly, but when I move the mouse/touchpad it resumes to the login screen.

 

yes of course i reinstalled .. lol.. this is driving me crazy

 

i uninstalled the touchpad driver and now it bsod'ed shut down and now does not re start power button no longer works.. arghhhhh

 

Sounds like possibly loose wiring (although I don't know off-hand how one gets from the touchpad down front to the wiring in back); is it possible that pressing on the touchpad causes the fascia around the keyboard to flex, which might convey movement to the wiring going up the back of the lid?

 

ok pulled the cmos battery now it works.. but it does about 20-30 screen flickers when it first hits the windows screen???

 

scratch that i restarted windows and now it doesnt turn back on again its dead again

 

Still sounds physical to me, like loose wiring or a component that's about to fail.

 

me too...sounds like more than a loose wire, maybe a short to me...when you're touching the keypad, you're completing a ground. If you can, remove the touchpad and see if the issue repeats.

 

well now... if i hold down f3 and fn for a second and then press the media button above the play button it starts up the laptop ie fan spinning etc. then if i press esc it boots to winows?? but if i shut it down doesnt restart. jut took the whole thing apart and reconnected everythihng nothing was loose and nothing seemed wrong.. hard to say of course..

 

i can recreate this each time. if i use the music button it boots right up?? what the heck??

 

its the music button plus power at the same time it will go to windows?? i dont get it.. even toshiba didnt know what to tell me??

 

With all due respect, that sounds like one physically messed up computer - i.e., it sounds like there's some sort of bizarre short somewheres that has the accidental result of causing start-up using an odd combination of keys. Kudos for having the patience to figure that key combo out, though!

 

yeah driving me crazy

 

Try, in order:

Reset bios to default (worth a try but debatable worth)

Remove power cord, and battery. Press and hold the power button for 10 seconds. Reinsert power adapter and try start up

Open up and remove bios battery (sometimes impossible as laptops will sometimes solder them in)

 

soldered in battery. they ended up not wanting to pay what it will end up in time / hours to fix this thing its almost 5 years old now lol and i did some reasearch on it and thousands of people has similar issues with this model

 

Hopefully they paid you for the time you've already spent, though!

 

lol im to nice.. yeah i charged them but no where near what im sure i should have but they are regular clients..

 

well i fixed this thing... wow what a pain, pulled the mobo un-soldered the battery use shorting pins to clear all power from all points of the board. put it back together with a modded external battery i could remove at will for temp purposes.

after all this i was able to blind flash the bios and now it works perfectly.. wow what a pain. they inisisted they wanted this thing fixed im not sure why, so whatever i charged em for it lol

 

*clapping*

YOU DA MAN!

 

lol well thank you (takes a bow).... they just picked it up and were exstatic im still not sure why they wanted a 4-5 year old toshiba a75 but whatever...$$ in my pocket

 

Kudos for perseverance!

 

thanks my next step was to get the board on my bench and start going though it..(i used to do circuit board repair at ibm)