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Random vertical lines on display

T400/T410/T420 and T500/T510/T520 Series
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brucehe
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Random vertical lines on display

#1 Post by brucehe » Tue Sep 25, 2018 7:39 am

This is on a T400 with LED backlight and integrated Intel graphics (no Nvidia gpu). Problem started with a vertical red line on the display a day after replacing keyboard. Replaced LCD with new. When first assembled and tried, display was all good, then restarted and a series of vertical lines appeared. Reseated LED driver card and resassembled and all was fine again. Put machine together and was good for a day with no lines. Then randomly on boot up a series of lines appeared. Rebooted and they were gone. Wiggled and twisted things but no lines appeared. Not sure how, when or if it will happen again?

Ideas? Bad lcd cable? graphics problem on system board? If I plug an exterior monitor in when the lines appear will that be a valid test for system board problem?

Thanks again for any assistance.

Bruce
P1 I7 8850H Gen1 32GB Quadro P1000 3840X2160 (CAD machine) , X280 (music machine), W520 FHD Quadro 2000M, Yoga 2 10 inch W10, (3)T450S 8GB 256 GBSSD FHD, touchscreen, backlit keyboard, X230T 8GB IPS 256GB SSD
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TheForgottenKing
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Joined: Fri Apr 13, 2018 11:41 am
Location: Chicago, IL

Re: Random vertical lines on display

#2 Post by TheForgottenKing » Tue Sep 25, 2018 9:09 am

Check cable, then display, then board
theforgottenki.ng
Surface Laptop 7: Snapdragon X Elite - 16GB LPDDR5x - 512GB NVMe - 15" 2496x1664
W701ds: i7-940XM - 32GB DDR3 - 256GB SSD + 1TB HDD - FX 2800M - 17" 1920x1200 + 10" 768x1280 - Wacom - Dock
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Thinkpad4by3
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Re: Random vertical lines on display

#3 Post by Thinkpad4by3 » Tue Sep 25, 2018 9:15 am

Pics please.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.
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brucehe
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Joined: Sat Jan 06, 2007 5:25 pm
Location: Corvallis, Oregon

Re: Random vertical lines on display

#4 Post by brucehe » Tue Sep 25, 2018 10:43 am

LCD is brand new. Pics can happen if the problem occurs again.

Bruce
P1 I7 8850H Gen1 32GB Quadro P1000 3840X2160 (CAD machine) , X280 (music machine), W520 FHD Quadro 2000M, Yoga 2 10 inch W10, (3)T450S 8GB 256 GBSSD FHD, touchscreen, backlit keyboard, X230T 8GB IPS 256GB SSD
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TheForgottenKing
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Joined: Fri Apr 13, 2018 11:41 am
Location: Chicago, IL

Re: Random vertical lines on display

#5 Post by TheForgottenKing » Wed Sep 26, 2018 11:09 am

Return it and get another one, might've been caused during shipping. If the problem still occurs then the LCD cable or motherboard might be the problem
theforgottenki.ng
Surface Laptop 7: Snapdragon X Elite - 16GB LPDDR5x - 512GB NVMe - 15" 2496x1664
W701ds: i7-940XM - 32GB DDR3 - 256GB SSD + 1TB HDD - FX 2800M - 17" 1920x1200 + 10" 768x1280 - Wacom - Dock
PC XT: 5160 + 5151 + 5153 + F XT - Intel 8088 - 640 KB - 2GB CF
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