Solved Distortion on screen can't locate the problem.

Lenovo / 20157
February 2, 2017 at 02:50:35
Specs: Windows, Intel i7 4500U
I am having this weird problem with my laptop. It started suddenly when I was just surfing the internet, the screen started distorting and now more than half of my screen is blank or shows different color when windows starts.

I have tried opening BIOS and this is how it look like http://i.imgur.com/bgnowoQ.jpg

I can tell it's not a broken screen because when I start DELL Diagnosis I can see the colors changing on the screen without any kind of distortion or lines.

I have also tried opening the laptop and resitting the display cable but still having the same problem.

Why be born again when you can just grow up?


See More: Distortion on screen cant locate the problem.

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✔ Best Answer
February 5, 2017 at 12:59:43
Screen cable is shown towards the end of this video:
https://www.youtube.com/watch?v=W2Y...
It might not be necessary to remove all that goes before - usually you can work this out as you go. Obviously the battery must be removed so that nothing gets accidentally zapped.

I've not really been able to make proper sense of the symptoms. Whatever you think of as a possible reason there seems to always be something that conflicts with the idea.

Always pop back and let us know the outcome - thanks

message edited by Derek



#1
February 2, 2017 at 04:28:08
Have you connected an external monitor to see if the behavior continues?

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#2
February 2, 2017 at 05:31:50
Seems its either the display itself or the display chip as Windows is not running when in BIOS. Try that external as suggested in #1 above to aid diagnosis.

Always pop back and let us know the outcome - thanks


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#3
February 2, 2017 at 10:47:34
Hello,

Seems like a hardware problem. Unless you weren't surfing anything that has the potential of infecting your PC with some weirdo viruses (who knows?), it has to be a hardware problem.

The only solution then is to have your computer serviced, my best bet is they can tell you if your screen is damaged or similar.

Also try connecting an external monitor, just to be sure.

Get back with results :)

Regards,
Jay Sarma
Music Producer and Game Developer
Dibrugarh, Assam, India
http://www.jaysarma987.tk


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Related Solutions

#4
February 2, 2017 at 13:45:51
So, today morning screen totally went off. It shows nothing now expect I can see the LCD light & know it's on. But the strange thing is when I goto "Diagnosis mode by powering off then press & hold D while pressing power button" it shows different colors on LCD which proves that LCD is perfectly fine.

Gonna check with an external monitor & report back.

Why be born again when you can just grow up?

message edited by manthan


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#5
February 2, 2017 at 14:16:52
Since the problem occurred in Windows & the BIOS, it's most likely a hardware problem rather than a virus. Try an external monitor as suggested. If you can't get a display, the graphics chip is probably bad. If it's integrated with the processor, you might be able to replace the CPU & be back in business. Is it an i7-4500U?

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#6
February 2, 2017 at 21:45:34
It's an i7 4500U with Nvdia 750M

Why be born again when you can just grow up?


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#7
February 3, 2017 at 12:10:25
Try the external monitor as suggested above.
If the external monitor works normally then you need to replace the laptop's screen. If under warranty, get factory service to do it. If not then it generally is not an extremely difficult process but differs by make. You can see if the mfg's web site has the instructions to do this or you can Google it for online Videos showing how it is done.
If the external monitor shows the same as the internal monitor then you will need to change out the motherboard or if used, a daughter board for the video. If under warranty contact factory service. If not under warranty you may want to take it in for service depending on your skills since most of the laptop will need to be taken apart and reassembled.

You have to be a little bit crazy to keep you from going insane.


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#8
February 3, 2017 at 12:23:49
Another Update.

Checked with HDMI and it's working. Dell Diagnosis also shows All the colors on screen making sure that the screen is also fine. Can the display cable be a problem?

Why be born again when you can just grow up?


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#9
February 3, 2017 at 12:42:48
When you say HDMI do you mean when plugged into a TV? If so is the picture then right in all respects? Similarly are the Dell Diagnosis colors on the on the screen in the right places and not duplicated? Your original screen shot shows repetition.

Always pop back and let us know the outcome - thanks


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#10
February 3, 2017 at 12:51:19
When using HDMI with a TV display is perfect fine & normal like a new laptop but only visible in TV and not on laptop.

Yes dell diagnosis colors in laptop display are Normal in right place.

Why be born again when you can just grow up?

message edited by manthan


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#11
February 3, 2017 at 13:21:42
Is the screen resolution set to match the native resolution of the laptop screen?

Its a weird one and I agree on the face of it the cable is a possibility. Did you check its connections at both ends?

Always pop back and let us know the outcome - thanks


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#12
February 3, 2017 at 16:50:37
Yes it is set to optimal resolution.

Yes I checked it's connection on the motherboard but I can't check it on the panel because idk how to open it. Can't find a video or guid.

Why be born again when you can just grow up?

message edited by manthan


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#13
February 4, 2017 at 16:12:29
Is this yours?:
https://www.youtube.com/watch?v=7Nf...

Always pop back and let us know the outcome - thanks


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#14
February 5, 2017 at 10:29:58
No, mine is Dell Inspiron 7737.

Why be born again when you can just grow up?


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#15
February 5, 2017 at 12:59:43
✔ Best Answer
Screen cable is shown towards the end of this video:
https://www.youtube.com/watch?v=W2Y...
It might not be necessary to remove all that goes before - usually you can work this out as you go. Obviously the battery must be removed so that nothing gets accidentally zapped.

I've not really been able to make proper sense of the symptoms. Whatever you think of as a possible reason there seems to always be something that conflicts with the idea.

Always pop back and let us know the outcome - thanks

message edited by Derek


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#16
February 6, 2017 at 02:58:17
Another update.

Today the screen went all black with just the LED backlights working whenever I turn on the laptop. HDMI still works & dell diagnosis still shows colors on display just fine.

So, I disassembled the whole display & resitted the flex cable that goes from motherboard to LCD (both ends), but nothing has changed.

I'm really confused now because this is very strange. I would doubt that the LCD motherboard has gones bad but dell diagnosis still shows colors on screen means it's fine (correct me if I'm wrong) so, now if I buy a flex cable and it's not a problem my money is wasted. :(

http://i.imgur.com/G3Kd3Ya.jpg

Why be born again when you can just grow up?

message edited by manthan


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#17
February 6, 2017 at 05:26:38
I can only assume that you can't place full reliance on Dell diagnostic for symptoms of this type. The way I see it the motherboard must be OK if it is OK on HDMI. This leaves the screen or its cable as the most likely culprits. There's no easy way to determine which it is without substitution and I sympathise about the possibility of wasted money.

Sometimes cables fail around the hinge area due to constant movement. Watch the screen carefully while you close it nearly all the way and open it. If there is any change on the screen then its a pretty sure sign it is cable trouble.

Always pop back and let us know the outcome - thanks

message edited by Derek


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#18
February 8, 2017 at 15:18:14
How does the Dell video diagnostic work? Does it change
the video output settings when it runs, and then the settings
change back when it is done?

Does the Dell diagnostic have a different video source from
the regular video chip? That seems very unlikely, but if the
diagnostic signal comes from a different chip, and uses the
same cable connection to the screen, then it would indicate
that the problem is in the regular video chip.

-- Jeff, in Minneapolis


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