LAPTOP FORUM

> Hi. My old Toshiba Tecra 8100 laptop has developed this fault with one
> whitish thin green line running vertically from top to bottom of screen on
> the right hand side near to the middle of the LCD Screen and I am trying
> to fathom out if this fault is to do with the LCD Screen itself or the
> Inverter module so I know what to replace.
> I have already replace the laptop main board (due to a different fault)
> but the laptop screen still has this vertical line there. So its not the
> graphics chip at fault on the main board and also when I plug an external
> monitor into the VGA port the line doesnt appear on the external monitor.
> Must be either Inverter or LCD Panel but which one????
> A video of the fault I have uploaded here on youtube so you can see
> whereabouts it is and how the line looks like:

> Andy wrote
>> Hi. My old Toshiba Tecra 8100 laptop has developed this fault with one
>> whitish thin green line running vertically from top to bottom of screen
>> on the right hand side near to the middle of the LCD Screen and I am
>> trying to fathom out if this fault is to do with the LCD Screen itself or
>> the Inverter module so I know what to replace.
>> I have already replace the laptop main board (due to a different fault)
>> but the laptop screen still has this vertical line there. So its not the
>> graphics chip at fault on the main board and also when I plug an external
>> monitor into the VGA port the line doesnt appear on the external
>> monitor.
>> Must be either Inverter or LCD Panel but which one????
>> A video of the fault I have uploaded here on youtube so you can see
>> whereabouts it is and how the line looks like:
>
> AIUI the inverter board provides the higher voltage required for the
> backlight. The line you describe usually indicates a bad LCD. Maybe its
> time for a new laptop?
>

> Hi. My old Toshiba Tecra 8100 laptop has developed this fault with one
> whitish thin green line running vertically from top to bottom of screen on
> the right hand side near to the middle of the LCD Screen and I am trying to
> fathom out if this fault is to do with the LCD Screen itself or the Inverter
> module so I know what to replace.
> I have already replace the laptop main board (due to a different fault) but
> the laptop screen still has this vertical line there. So its not the
> graphics chip at fault on the main board and also when I plug an external
> monitor into the VGA port the line doesnt appear on the external monitor.
> Must be either Inverter or LCD Panel but which one????
>
> A video of the fault I have uploaded here on youtube so you can see
> whereabouts it is and how the line looks like:
>
> http://ie.youtube.com/watch?v=xtqPjSBZDiI or http://tinyurl.com/2nqho9
>
> Thanks for any helpful advice.
>
> Andy.
>
>
>

> It *could* be the LCD (Specifically the chip that deals with the LCD
> column drive ) or ( *Much* more likely IME on old laptops) the multiway
> cable or connector connecting the LCD to the main board. If the cable, you
> may be able to make the fault come & go by flexing the lid gently to & fro
> with the unit operating. If the fault has appeared since you changed the
> mainboard, its very likely that either the connection isnt fully seated
> or the cable is damaged.

> Andy wrote:
>> Hi. My old Toshiba Tecra 8100 laptop has developed this fault with one
>> whitish thin green line running vertically from top to bottom of screen
>> on the right hand side near to the middle of the LCD Screen and I am
>> trying to fathom out if this fault is to do with the LCD Screen itself or
>> the Inverter module so I know what to replace.
>> I have already replace the laptop main board (due to a different fault)
>> but the laptop screen still has this vertical line there. So its not the
>> graphics chip at fault on the main board and also when I plug an external
>> monitor into the VGA port the line doesnt appear on the external
>> monitor.
>> Must be either Inverter or LCD Panel but which one????
>>
>> A video of the fault I have uploaded here on youtube so you can see
>> whereabouts it is and how the line looks like:
>>
>> http://ie.youtube.com/watch?v=xtqPjSBZDiI or http://tinyurl.com/2nqho9
>>
>> Thanks for any helpful advice.
>>
>> Andy.
>>
>>
>>
> Definitely not the inverter. The screen looks even enough & not flickering
> on the video, so the inverter & cold cathode tubes as well as any dimmer
> control connected to them are almost certainly OK.
>
> It *could* be the LCD (Specifically the chip that deals with the LCD
> column drive ) or ( *Much* more likely IME on old laptops) the multiway
> cable or connector connecting the LCD to the main board. If the cable, you
> may be able to make the fault come & go by flexing the lid gently to & fro
> with the unit operating. If the fault has appeared since you changed the
> mainboard, its very likely that either the connection isnt fully seated
> or the cable is damaged.
>
> If you can make a DOS boot floppy, you can run the Toshiba DOS diagnostics
> for your machine which you can get off the Toshiba Canada website (
> www.toshiba.ca ) by navigating to support, then selecting your model
> number & following the links. Usually, its a self extracting archive,
> that will install DOS and the utilities onto a blank floppy disc. This
> removes Windows & all its drivers from the picture, & lets you confirm
> its a hardware fault.
>
>
> Hope this helps.
>
> --
> Tciao for Now!
>
> John.

> John Williamson wrote
>> It *could* be the LCD (Specifically the chip that deals with the LCD
>> column drive ) or ( *Much* more likely IME on old laptops) the multiway
>> cable or connector connecting the LCD to the main board. If the cable,
>> you may be able to make the fault come & go by flexing the lid gently to
>> & fro with the unit operating. If the fault has appeared since you
>> changed the mainboard, its very likely that either the connection isnt
>> fully seated or the cable is damaged.
>
> I think the cable is unlikely. The LCD is driven via multiplexed data on
> the cable so if there was a bad connection I would expected more than a
> single screen line to be affected.
>

> Andy wrote
>> Hi. My old Toshiba Tecra 8100 laptop has developed this fault with one
>> whitish thin green line running vertically from top to bottom of screen
>> on the right hand side near to the middle of the LCD Screen and I am
>> trying to fathom out if this fault is to do with the LCD Screen itself or
>> the Inverter module so I know what to replace.
>> I have already replace the laptop main board (due to a different fault)
>> but the laptop screen still has this vertical line there. So its not the
>> graphics chip at fault on the main board and also when I plug an external
>> monitor into the VGA port the line doesnt appear on the external
>> monitor.
>> Must be either Inverter or LCD Panel but which one????
>> A video of the fault I have uploaded here on youtube so you can see
>> whereabouts it is and how the line looks like:
>
> AIUI the inverter board provides the higher voltage required for the
> backlight. The line you describe usually indicates a bad LCD. Maybe its
> time for a new laptop?
>