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Need help diagnosing faulty LCD

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#1 One2Remember


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Posted 23 August 2014 - 10:04 PM

Was rough with my laptop the other day (Lenovo IdeaPad Y500), and when I opened it, the LCD was wonky. Black or dark colors look bright red and every other color "shivers" in an epilepsy inducing way. I did some of my own diagnosis and figured it was a faulty cable connecting to my LCD. Just want to make sure you all agree with me, and maybe give me some advice on how to proceed.


Troubleshoot 1: Plug laptop into external monitor to see if it's the graphics card.

Results: Second monitor looked fine, so I'm ruling out the graphics card as the issue.


Troubleshoot 2: Squeeze the screen around the edges and in the center (basically all over) to see if the screen discoloration changed at all.

Results: No change whatsoever no matter where I pressed. Makes me think it isn't a bad screen.


I haven't actually opened my laptop yet, waiting til I can get back to school where I'll have access to a work bench with static bracelets and the proper tools, but I'm guessing I either loosened or damaged the wire connecting to my screen, and that I'll need to replace it if resetting it doesn't do the trick. 





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#2 kokomodrums


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Posted 23 August 2014 - 10:51 PM

By plugging in an external monitor, you have eliminated essentially all software issues. I think it definitely sounds like a bad connection rather than a bad LCD. Have you tried adjusting the screen up/down to see if the results change at all? That would be another good sign. But yes, I think you've worked out the most probable cause--good luck with the teardown (I hate laptop cases...)!

-- Matt

#3 Kilroy


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Posted 24 August 2014 - 05:10 AM

I'm with kokomodrums this sounds more like a connection type issue than a faulty panel as I've never seen a panel fail like that.

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