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White screen with lines

Hi, my Toshiba Satellite C55D-B5308 laptop fell off my bed and it started to display colored horizontal lines:

I turned it off and on again and it changed to a solid white screen with really-hard-to-see vertical lines.

The LCD is not cracked (I flashed a light while it was off and didn't notice any broken pixels) and flexing the upper chasis does not change the pattern.

I disassembled and reconnected the display ribbon cable, pushed the CPU a little bit, reseated RAM and also checked if the cable inside the LCD panel was connected correctly (it was, I reseated it anyway)

None of this fixed anything. I must note that it turns off automatically and connecting to an external display does absolutely nothing. Any help?

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Does it do this the second you power it on, or does it post at all.

Alec さんによる2019年1月9日

I turn it on and this happens immediately, it's not a software issue, also the lines don't move and the color doesn't change. (The lines can be seen if you look at the screen in a certain angle)

Miguelito G. さんによる2019年1月9日

Miguelito, What does that text say on the screen below the coloured lines?

mike さんによる2019年4月3日

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投稿日: 2019年1月9日

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That can be a number of things. Unfortunately unless you have other similar laptops for testing, the only way to troubleshoot is to spend money on parts. I’d start with the motherboard as that’s the most likely. If that doesn’t fix it, try the screen (make sure the inverter is built in). I would also replace the LCD cable since it’s so cheap. Good luck! If you do have test laptops, I’ll gladly help you troubleshoot.

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Update:

https://i.imgur.com/EoovSSm.jpg

Miguelito G. さんによる2019年1月14日

That's definitely the screen then. Replace the lcd screen and you'll be fine.

Alec さんによる2019年4月4日

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White screen with lines

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