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Vertical colourful lines on laptop display.


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#1 magina

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Posted 30 April 2015 - 12:18 PM

I have a Lenovo y410 laptop which has a display issue. At first, there were flashing horizontal lines right after from the lenovo icon before system boot up. so I opened the device and checked around the internal connections and the flashing horizontal lines are gone but now there are very thin horizontal lines(dead pixels maybe) so that it has become very difficult to read texts with small fonts. And also after booting the system up there are many vertical colourful lines (the lines appear where the icons are, even the mouse pointer icon). The weirdest thing is the vertical lines are gone during video playback. I tried to take the screenshot of the screen using snipping tool and the image produced by it is perfectly clear. I'm sure this is not a driver or graphic chip issue as external monitor display is fine. what might be the cause? Is the LCD panel fried or is it the display cable or something else....please help...

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#2 magina

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Posted 01 May 2015 - 04:46 AM

Hello...anyone?

#3 Platypus

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Posted 01 May 2015 - 06:03 AM

The fact that the effect does not occur on a video playback should lead us to rule out the LCD panel, which doesn't get any different signal between video and a desktop, but are the horizontal dead pixel lines also absent on video material?


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#4 magina

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Posted 01 May 2015 - 06:07 AM

The video playback is also a bit pixelated...

#5 Platypus

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Posted 01 May 2015 - 06:23 AM

The LVDS cable carrying the signal to the LCD is a candidate, especially the connectors. They are sensitive to any tarnish on the contacts and a polish up or application of a quality electronic contact cleaner can clear things up.

 

It is still possible for a fault in video chip or video memory to create a problem like this, as a different section of the chip and memory are used for internal screen drive and external. Video can appear clean as it's injected as an overlay directly into the feed to the LCD. But if video isn't completely clean, more likely LVDS or internal LCD fault.


Edited by Platypus, 01 May 2015 - 06:24 AM.

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#6 magina

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Posted 01 May 2015 - 07:28 AM

Thanks man, I'll try replacing the cable and report back.




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