Question about Toshiba Portege 3500 Tablet PC

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Touch Screen When I use the pen on the screen it works fine until it comes across a one inch section in the middle of the screen (that goes completely across the whole screen). After passing that dead area, the cursor finds the pen again. I heard when I upgraded to SP2 (WindowsXP) this may have caused the problem. The screen is seems fine and has not been damaged that I can tell. Have you heard of this before and can you tell me the cure? Thanks Bill Sommerville.

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  • corbenfrost Jan 21, 2008

    I have the same problem with the dead strips and I would like to try this solution but does anybody know how to safely take apart the monitor?

  • aleiweke Sep 30, 2008

    I have a strip about an inch or two to the right of the screen that the stylus will not work on. It works until it hits this point then stops then starts again once I pass it.

  • Anonymous Jan 13, 2009

    half the screen works when attempting to move the cursor/draw
    other half doesnt work except for a small bit on the edge as well as a huge 1inch band right through the center going horizontally.


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Just fixed this mine bought from ebay.
(i) Remove the battery and disconnect the power supply!
(ii)Use a pin to lift the six screw covers around the screen and remove the screws.
(iii) Carefully remove the screen surround starting at the hinge. I used a mobile phone opening tool as this made it easy to unclip where necessary.
(iv) Remove the four screws holding the screen in place and the one holding the screen invertor(?)
(v) Place something soft over the keyboard and tilt the screen forward out of the lid onto it, You may have to remove some of the tape holding the ribbon cables to allow it to separate.
(vi) There is a small PCB on the back that controls the digitiser. Two ribbon cables go to this nearest to the edge of the screen. Again you may have to remove tape to do the following. Lift the brown plastic clamps that hold the ribbons in place. I slid both ribbons out and checked the connections were clean and not corroded on the ribbon. Again I had to remove more adhesive tape to do this.
(vii) Slide the ribbons back into place so they are fully home and close the clamps.
(viii) Reassemble fitting all the tapes screws etc.
The hardest bit is getting the screen and screen protector clean and free from dust while reassembling!!

Posted on Feb 18, 2009

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Are you using latest drivers for the tablet pen aplication? if not try to use latest aplication drivers for pen. cheers

Posted on Aug 25, 2007

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My M1300 had the same problem. I opened it up, turned it on, and fiddled around with the ribbon-cable connectors on the back of the display. That fixed it for me. There are two circuit boards on the back of the display. The smaller one has three ribbon-cable connectors, two of which look identical. It was one of those two that made the difference, when I pressed it into the socket to make sure it was firmly connected.

Posted on Sep 16, 2007

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This is a common problem with these PCs. I have had the screen on mine replaced once and now have multiple dead strips going both ways across the screen. I did note some time back that I could fix the dead patches by swiveling the screen to and fro.. maybe the fault is caused by the connection between the screen and the laptop..

Posted on Aug 31, 2007

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Does anybody know how take apart the monitor to check the cables or possibly replace the sensor pad?

Posted on Jan 21, 2008

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I know I went through wuite a few driver upgrades recently w/mine ... not to say these are new updates ... but I've only recently made regular usage of mine ... go to toshiba online iris support there are upgrades available ... ( i.e. driver and firmware -- i believe I remember one being the touchscreen ( which is not really a touchscreen as much as TFT capable of input via the stylus ( and ONLY the stylus by toshiba which is kinda nice 00 no bumps and bruises )) it's a TFT also btw ... so you have a transparent grid which accepts your input via the toshiba stylus ... try to ( if you are willing to ) unscrew the lcd (TFT) portion and reseat the connection ( usually located unerneath the control panel ( just north of the keyboard) again .. they aren't dead pixels... on the contrary ... they're not output at all ... if anything it's a dead circuit which ( i believe --- not quite all read up on exactly how TFT's work -- but i'd venture to say it's just like a grid transistor , and it should probably give you an entire dead line at a time if that line on the 'graph paper' has a spot of white out 'whiting' out a thorough connection.... saying it changes or 'kinda fixes' it when you swivel ... makes me thing the input may be on an array ... or X,Y coordinate plane where your aspect ratio might play a role ... therefore maybe once swiveled X,Y where 1024x768 will yield a different coordinte once swiveled to the 768x1024 mode ... and that input may not be seated quite right ... or may need reseating ... dunno ... I guess i should read up on how TFT input works .. dave oh.. and those drivers ... i wanna say i'm 90% sure there has been an update to the original .. (firmware -- i mean)

Posted on Oct 08, 2007

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I'm not familiar with your laptop but judging from all the pdas I've had with touch screens the pen itself is only a pen, you could basicly use a wooden stick to poke at the screen and it shouldn't make a difference to the computer.

this laptop has a touchscreen If I'm not mistaken and you should be able to use it even with your fingers.

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