I have a toshiba laptop, it's about 4 years old, had been working flawlessly until ...
Recently, the LCD screen started to show some artifacts, like flickering, screen freeze in dark image and corner starts to get brighter. Most of the flickering happens in a horizontal pattern (horizontal lines, parts)
At first, moving the screen a little bit corrected the problem.
Now, if it appears at startup, its very hard to get rid of it (the screen may get clean, but the problem reappear very fast).
But sometimes, it just works fine.
Searching in the web, I concluded this could be a screen inverter failure, but I have no idea if another piece of hardware could be responsible of this.
Please note, the problem appears even before loading the os and an external screen works correctly.
What do you think ?
It could be the inverter, backlight, or the LCD panel itself.
Backlight failure is usually hinted at by a pink hue to everything.
Inverter failure usually results in the dimming of images on the screen to the point where the backlight is not even on (the inverter provides power to the backlight)
This sounds more like it is a failure in the LCD panel itself, though it could just as easily be a loose data cable connected to the back of the LCD. If you're feeling adventurous and you laptop is out of warranty, you can take the LCD out of the bezel and reconnect everything, checking for loose cables along the way. It's really not that hard, and what do you have to lose? Either you pay to have it replaced, you fix it yourself, or you break it trying to fix it yourself, but you probably would have to get it replaced anyway.
It could be a backlight related problem or the connector just got a bit loose.
I think, its time to get a service round with your laptop.
My Dell had a loose display connector after about 5 years and one service round got it fixed.
The service tech would also be able to tell you if you need any specific part replacements.
If you really want to try this out yourself,
I'd suggest at least getting the service manual for your model handy
(calling the tech is the safest method though).
I'm not sure what causes the problem but it's quite common on laptops, I suspect it's something to do with the way the screen flexes when it's opened and closed since I've never seen it on a desktop flat screen. Whenever I've reported the fault to a laptop manufacturer they have always swapped the screen out (under warranty) so I expect that's what you'll have to do.
I have an LCD monitor which was, arguably, relatively cheap. Undoubtedly it's due to cheap manufacturing, but after a while of continuous use, I start to see artifacts of previous images (resembling CRT burn-in). I've also noticed the these areas of the screen tend to get a bit toastier than unaffected areas.
Turning off the monitor for a while does return it to normal, so it's not a permanent problem, but it is rather ugly when it happens. A Google search resulted in no more than "this happens sometimes". Does anyone else have experience with this?
Anyone know the cause of this? (Feel free to get as technical as you'd like.)
Aside from the obvious of trying to exercise the pixels as much as possible when in use (i.e. don't leave SO/SF/SU in a browser open all day), is there anything I can do to reduce this? Would improving cooling help or is it not heat-related?
I don't think it's cable or video card related at all. It's usually the top left corner, and artifacts of things that don't change regularly (the desktop, browser toolbar, etc) are still visible when I change what is shown there (usually by switching to another application). Like I said, it looks like CRT burn-in. When the monitor is off for a while and is turned back on, however, the problem goes away.
It could very well be the cables, but where are the artifacts located on the screen? That is a huge determinant. The edges of a screen are generally warmer and so it may not be a related symptom.
But that aside, the answer you're looking for has many possibilities. My belief is simply that you have dying/near dead pixels.
I've had some success in this area both with switching to a better VGA cable and with switching to a DVI cable instead, if the monitor supports DVI. Of course, you may need to buy a video card that supports DVI, but those are much less expensive than a new monitor.
How is your monitor hooked up? If you are using VGA cable now, but have the option to go DVI, try to see if switching to DVI gives you a better image.
I have no idea the cause, but both of my dell 2005FPWs exhibit this. They're both in use 12+ hours a day, some times displaying the exact same image (iTunes). I didn't get any farther than you, except to discover that IPS-based models are somewhat more susceptible. It certainly is not a cabling issue, as I've had the same cables over the 4+ year lifespan of the monitors which have only started having the issue in the last year or so.
I had similar sounding symptoms with a cheap TFT that I had. I managed to work out that it seemed to be related to the monitor getting too hot. If it's somewhere with bad airflow or in direct sunlight I'd suggest moving it and seeing if that helps it.
Or try turning up your air conditioning if you have it.