[ltp] vertical lines error on the lcd screen

[U Kuehn]

Francois Maltey wrote:
>> Let's try to figure out the problem. Are the vertical lines shown in
>> regular intervals, e.g. every 16 Pixels or so? Or is the pattern rather
>> irreguar?
> 
> Rather irregular. Not every 16 nor 32 nor 64 pixels.
> When I scroll in firefox-mozilla this window (not the mail one) become
> unreadable : the pixels in THIS windows seem almost randomize, but
> there is the same pattern shifted pixel line after pixel line, only in
> this window. Sometime the background light goes off for 1 or 5 seconds.
> 

That is really a strange behavior. And certainly not a good sign. Why
firefox? Are there other things that are affected by the problem? If it
is only the firefox window that is affected (e.g. not the window border
drawn by the window manager), I would assume that it is a software
problem. But your original description of the vertical lines sounds
rather like a hardware problem.

>> There are a number of parts that could cause the problem. It could be
>> the video RAM, or the subsystem that transmits the pixel data to the
>> screen (I think it is done digital and serially), or the subsystem in
>> the screen that converts the data to the actual screen picture. Maybe
>> also something more...
>>
>> How old is the laptop? Do you still have warranty left?
> 
> It's a 30 month old laptop. It's still under warranty.
> If it isn't an easy repair I'll send it to IBM/lenovo.

Although I have no idea what is causing the problem. If you can rule
out, after some more tries, that it is a software problem, you should
really consider sending it to repair under warranty.

Hope this helps
Ulrich