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White horizontal lines running across laptop screen

Hi, This problem only started to occur this week, there are thin white lines running across the screen and and they flicker a littlebit. I don't know what the problem is, but when i play a game they sometimes just vanish but then eventually they come back its very annoying when i try to watch a movie or just for normal surfing. And the laptop isnt even a year old. Ive taken a screenshot: http://imageshack.us/photo/my-images/36/laptopwhitelinesacrosss.jpg/ My laptop specs are: Acer Aspire 7750g Intel Core i7-2630QM Amd Radeon HD 6650M 17.3" Hd+ LED LCD 8GB DDR3 Thanks in advance!

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  • Dell Master
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I did not see any white lines, Simon, in the screenshot.
Just sayin'.
(Glad you tried to post it though!)

The problem is caused by a faulty Video Cable, or it's in the Display Assembly.

However, you better start the diagnoses with using an external VGA monitor, and see if the lines show up on the external monitor, also.
This would indicate a bad graphics chipset.

For most people that would mean replacing the motherboard.

A) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA connector, on the Left side of the laptop.

Example of a VGA cable, and VGA port, (Connector),

http://en.wikipedia.org/wiki/VGA_connector

You can use a external VGA monitor that is a CRT type, (Looks like a small TV), or a flat LCD screen monitor with a VGA cable.

A1) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By default the display should show on the external monitor.
IF Not,

Press, and hold down on the Fn key, (Bottom left of Keyboard), and at the same time tap on the F5 key. (Top of Keyboard)
{The F5 key is the Display Toggle-Over key }

No?
There are at least 3 display options available.
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY.

Hold the Fn key down again, and tap once more on the F5 key.

Graphics look good on external VGA monitor?
Your graphics chipset is good.
Problem is Video Cable, or in the Display Assembly.

B) Video Cable: (LVDS Cable)

http://www.insidemylaptop.com/disassemble-acer-aspire-7551g-laptop/

The above is for an Acer Aspire 7751G, but it is close enough to the 7750G models, and info should directly crossover.

Scroll down to Step 17.
The Video Cable connection to the motherboard, is shown by the yellow arrow at the Top Left.

Note, although the photo is less than, the routing of the Video Cable.
It goes through the Left Hinge.
(Then into the Display Assembly, and connects to the back of the LCD screen)

With normal opening, and closing of the laptop, the Video Cable could be pinched, or have been pinched. Could have been pulled on.

You close the laptop, the cable is slightly pinched in the Hinge, and it pulls loose from the motherboard connection, AND/OR the LCD screen connection.

Doesn't take much of a loose connection. In fact it's hard to discern with the human eye, sometimes.
Make sure this motherboard connection is tight.

You have to open the Display Assembly, and check the Video Cable connection on the back of the LCD screen.

Doesn't look loose? Try to plug it in tighter anyway.

Check the connection of the wire/s from the Video Cable, TO the screen Inverter.
The small circuit board behind the Display Bezel, (LCD Bezel), and mounted to the bottom of the LCD screen.

When on the motherboard side, the side of the Video Cable that runs through the left Hinge, is there any apparent damage? Damage to the sheath of the Video Cable?

If there is, chances are the tiny wires inside the Video Cable, are damaged also.
Check with a multimeter. Perform a continuity test of Each wire.

C) Display Assembly:
Video Cable checks out then the problem is in the Display Assembly.

1) Screen Inverter:

http://www.sparepartswarehouse.com/Acer,Aspire-7700-thru-9800,Laptop,Inverters.aspx

http://www.insidemylaptop.com/replace-broken-screen-acer-aspire-5745g-laptop/

Not your model, granted. Posted for the Display Assembly dis-assembly pictorial guide.

Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL, or a series of LED lights.
Your laptop uses a series of LED lights for the Backlight.

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

A CCFL requires a screen Inverter.
A screen Inverter converts the power from the laptop, for the Backlight, and LCD screen.

NOT all LCD screens that use LED lights as a Backlight, use a screen Inverter. I suspect yours does not, as I can't find a listing for a screen Inverter, for it.

http://www.laptopscreen.com/English/section/FAQ/1245191276/Correct%20backlight%20type%20for%20your%20new%20screen/

This would mean that if the Video Cable proves to be good, the next step is to replace the LCD screen.

Shop around for the best price, AND make sure it is a direct replacement for yours.

Regards,
joecoolvette

Posted on Feb 13, 2012

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