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White horizontal line on screen
I am having an issue with my laptop (Latitude 5480) screen as you can see below, horizontal white lines is appearing in the middle of the screen. Please advise.
1 Rookie
•
8 Posts
1
39433
I am having an issue with my laptop (Latitude 5480) screen as you can see below, horizontal white lines is appearing in the middle of the screen. Please advise.
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DELL-Chris M
Community Manager
Community Manager
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55.5K Posts
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November 25th, 2020 06:00
The "flex" testing is not part of our LCD panel troubleshooting path. As far as I know, LCD panel flex testing is only done by our laptop manufacturer on the build lines prior to Dell ever receiving the laptop.
For an LCD panel line issue, we would present the LCD BIST (Built-in Self Test).
ejn63
10 Elder
10 Elder
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25.8K Posts
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November 20th, 2020 03:00
The screen diagnostic will help here: hold the D key through powerup. If that line shows on the screen self-tests (it likely will), the screen needs to be replaced.
At least it will leave you with an unbroken, intact screen - unlike a "flex" test, which could well crack an otherwise undamaged screen.
U2CAMEB4ME
4 Operator
4 Operator
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6.2K Posts
2
November 20th, 2020 03:00
Welcome to the Dell Community @bella231
Looks like a cold solder joint on the LCD.
Try performing a “Flex Test”
While the laptop is booted and the screen is on:
Grab the display at the upper left and right corners.
Then pull one side forward and push the other side backwards about 1/2" to 1"
Repeat back and forth. "Flex Test"
Is there any change in the display while flexing??
Best regards,
U2
U2CAMEB4ME
4 Operator
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6.2K Posts
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November 20th, 2020 10:00
From your unsubstantiated comment about a “Flex Test” damaging an LCD, it is evident that you have little or no experience working on laptop LCD’s.
Every laptop that we have tested over the last 20 years always ends with a “Flex Test”.
That would be well over one million laptops and out of my share of the million I have not cracked a single LCD performing a “Flex Test”
That does not include all the LCD’s that we test separately.
It is a quick and SAFE way to check for cold solder joints, which results in lines on an LCD.
Just because of your resentment for me does not justify your unsubstantiated comments.
Best regards and may you have a nice day,
Timothy J. Connors
ejn63
10 Elder
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25.8K Posts
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November 20th, 2020 10:00
Recommending that someone flex an LCD display is not wise. It takes very little to crack a display panel these days, with very little in the way of give remaining in the very slim screen casings.
I am simply pointing out there's a better way than risking system damage. Flexing won't fix the problem. It's evident here, and the diagnostics are all one needs to verify that and find the solution.
It's not prudent to suggest a test that can cause damage that does not presently exist. That's all I was pointing out.
If the system is out of warranty and that line is the entire issue, it's fairly easy to live with. The same cannot be said for a cracked screen that arises as the result of a poorly thought out solution to the issue.
U2CAMEB4ME
4 Operator
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6.2K Posts
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November 21st, 2020 03:00
I have worked on enough 5480’s to know that a “Flex Test” would not CRACK the LCD or DAMAGE the SYSTEM. “Absurd”
Of course “Flexing won’t fix the problem.”
You actually thought that was meant to be the solution???
A “Flex Test” is what it is, a “TEST” not a “FIX” that’s why it’s called a “TEST”
The reason for the test is a screen that looks exactly like the one the OP posted.
Most of the time it is caused by opening and closing the lid!
You open it one time its ok the next time you have lines, back and forth.
Flexing the LCD while it is open will help determine if it is the LCD or possible the LCD flex cable.
You make it sound like I asked the OP to BEND the LCD.
Again it is a test that I have performed many times before and have not “Cracked an LCD” or “Damaged a System.”
Best regards and have a nice day,
U2
Thank you for your concerns and your opinion.
AdrianG001
4 Operator
4 Operator
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4K Posts
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November 21st, 2020 04:00
This could be an issue with the LCD. To isolate the issue follow below steps:
ejn63
10 Elder
10 Elder
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25.8K Posts
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November 21st, 2020 04:00
And remind us, please -- exactly what your flex test -- which, despite your luck in not breaking a screen -- yet, carries risk with it -- shows that the screen diagnostic does not?
A single-line fault will appear in operation and on a diagnostic screen, and means the screen needs to be replaced or lived with.
And bending the LCD is exactly what your procedure sounds like you asked.
The built-in diagnostics run from the screen itself - they do not pass data through the wiring harness from the system board, so they're just as effective as your "flex" test.
Wayneos
4 Posts
1
July 27th, 2022 16:00
I know this is a bit old but I Had a thick vertical line on my Inspiron 15 5000 screen, not there when connected to the monitor, stays there when you press D and power button. This suggests it is either the screen or the screen cable, I performed the gentle flex test and the vertical line disappeared. Should I get a new screen or just replace the cable?
Thanks
Wayneo
Zoxzoa
1 Message
1
January 24th, 2023 21:00
Im telling you, I made an account for this site just to thank you LOL
I jokingly did what you said even though I'm not on laptop but instead a 24" monitor, and to my surprise it worked