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Why does laptop screen flicker and sometimes screen goes black?

This flickering happens daily and the black screen is occurring more often. would this be indicative of needing a new battery? It was purchased in 2008 and had little use until the last year.

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  • Jason Burkhardt Feb 19, 2012

    Its probably not the battery unless the laptop turns off completely when the screen goes black (e.g. no fans lights etc). If its flickering and goes black, but there's still noise or lights it could be a loose video cable, a dying video card, or the screen is going.If the flickering is affected by adjusting the screen it is most likely the cable is starting to get loose.If you post your laptop model and anything that affects the flickering or black screen, I can try to assist more.

  • Cami Wilkinson Feb 19, 2012

    Thanks, Jason. It's HP DV2910us Entertainment. The lights stay on. I have to turn the computer off and then on and then it comes back. Would it be cheaper to buy another laptop if the screen is going?

  • Jason Burkhardt Feb 20, 2012

    If it is the screen that's going it will end up being almost as expensive to replace as get a new laptop, unfortunately.

    If I were you, I would back up all of my important data to an external hard drive or online storage site and then take it to a local repair shop or a friend who'd be willing to make sure the LCD cable is plugged in firmly.

  • Cami Wilkinson Feb 20, 2012

    Thank you again, Jason. Much appreciated!

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  • Master
  • 5,660 Answers

If it were I, I or a friend with basic skills, would open the laptop, and check it out myself. Save $$$$$$$$$

JMHO

HP Support > Pavilion dv2910us Notebook PC > Main Support page,

http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&lc=en&dlc=en&product=3747188

Click on Manuals in the right side list.
Scroll down, click on -
HP Pavilion dv2500 and dv2700 Notebook PC - Maintenance and Service Guide

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the file name it may take up to 30 seconds, before the first page comes up.
(Took 10 seconds just now using a medium speed DSL connection )

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

A Backlight can be a CCFL, or a series of LED lights.
The HP Pavilion dv2910us Notebook PC uses a CCFL.

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

(Usually 2mm Wide, by, close to the height of the LCD screen)

A screen Inverter converts the power (Electricity) from the laptop, for the Backlight, and LCD screen.

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.

The screen Inverter is located behind the Display Bezel, and mounted to the bottom area of the LCD screen.

{The Display Bezel is the thin piece of plastic in Front of the LCD screen, and surrounds the LCD screen, in front }

Example of a Pavilion dv2910us screen Inverter,

http://www.batterycentury.com/hp-pavilion-dv2910us-inverter-p-177051.html

Wires in a cable with a connector on the end, plug into the screen Inverter, and come out of the screen Inverter.
The connectors are different so there is no mixing them up.

A) Remove ALL power. Remove the AC adapter (Charger) and Battery.

B) Follow Anti-Static Precautions.
Work on a table. Not on a bed, couch, or directly on a carpet floor.
If the table is on a carpeted floor, refrain from swinging your feet across it.

If you do not have an ESD wrist strap available, (Average cost $3 to $5),
at least place a large metallic object on the table (Unpainted), and touch it before, and occasionally during working on the laptop.

Perhaps a large metal serving tray (Unpainted), or large metal knickknack. (Unpainted)

C) Now in the service manual, go to the Bookmarks menu on the left side, click on the + sign to the left of -
Removal and replacement procedures

Click on the + sign next to - Component replacement procedures
Scroll the bar down, click right ON - Display assembly

{You can reduce, or increase the view size.
The ( + ) Zoom In icon increases the view size.
The ( - ) Zoom Out icon decreases the view size }

In the instructions anything that is in blue, can be clicked on to take you to more in-depth info, on that subject.

You are looking to see for one, if the Video Cable connections have come loose.
It doesn't take much, and just viewing with the human eye may not discern if it is loose.

The procedure is to physically check, to make sure the connections are tight.
The Video Cable plugs into the motherboard, then routes under the left Hinge, and up into the Display Assembly.
There it connects to the Back of the LCD screen.

{HP:
Video Cable = Display Panel Cable.
LCD screen = Display Panel }

You have to remove;
1) All power,
2) Switch Cover (Page 79 in the page number box, at the top of the PDF file)
3) Keyboard (Page 75)

,and then you have access to the Video Cable connector, on the motherboard side.

You have to remove:
1) All power
2) Switch Cover
3) Keyboard
4) Display Assembly,

and remove the Display Panel far enough from the Display Enclosure, to physically make sure the Display Panel Cable is plugged in tightly.

Opening, and closing the laptop may have pinched the Display Panel Cable (Video Cable), and pulled one, or both connections loose.

Since the Display Panel Cable is also routed under the left Hinge, it can be pinched enough to damage it.
See if there are obvious signs of damage to the sheath of the cable.

Have someone with a multimeter set to Ohms, check the continuity of the wires, in the Display Panel Cable.

{Average cost for an inexpensive multimeter to perform this test, is around $8 to $12.
Available in a multitude of stores. An auto parts store is but one example. Analog or digital is fine. I prefer Analog }

Have an assistant gently wiggle the cable while checking for continuity, to see if there is an intermittent break.
Indicates a broken wire in the Display Panel Cable.

http://www.pelltechnology.com/HP/Laptop/HP-Pavilion-dv2000-Series/dv2900-dv2910us/HP-Pavilion-dv2910us-LCD-VGA-Video-Cable.html

Cable checks out replace the screen Inverter.

[ The test for a screen Inverter uses a sensitive multimeter. Not something everyone has laying around. Most consumers who do not have this tool, replace the screen Inverter,

http://www.fonerbooks.com/test.htm

The low cost, and ease of access also helps ]

Display Panel Cable, and screen Inverter check out?
Problem is CCFL, or LCD screen.

http://www.pelltechnology.com/HP/Laptop/HP-Pavilion-dv2000-Series/dv2900-dv2910us/HP-Pavilion-dv2910us-CCFL-Backlight-Bulb-for-LCD.html

http://www.ccfldirect.com/lcdtutorial.html

Continued in Comment.

Posted on Feb 20, 2012

Testimonial: "Very helpful. Thanks, Joe!"

  • joecoolvette
    joecoolvette Feb 20, 2012

    http://www.screentekinc.com/HP_Pavilion_...

    For additional questions please post in a Comment.

    Regards,
    joecoolvette

  • joecoolvette
    joecoolvette Feb 21, 2012

    Thank you, you are Most Kind, Camille Wilkinson!

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Posted on Jan 02, 2017

  • 788 Answers

SOURCE: Same Problem, No apparent reason, Screen flickers, goes out

You may want to rule out a loose connection.
Move the laptop screen back and forth and see if you notice any flickering.
This does not sound like a software issue, so we can rule that out.
If you have a consistant brightness on the display, we can rule out the backlight.
Their are two connection points on the display monitor, one is just under the power button and the other is behind the LCD screen.
I was going to suggust plugging into a external monitor but can't really see any outcome in that.
It may be a inverter problem, that is located inside the LCD, just behind the HP square design. You will find a input and output.
If any of these connections have come loose, that would cause the flickering.
If the backlight is consistant in value, you can rule out the lnverter.
If the unit has been dropped, it can be any of the above.
With the 20 min. to 6 hours useage, I would go with the inverter. If after the unit cools down for a few minutes, it works again, its the inverter.
Hpoe this mess of info has helped.

Posted on Aug 27, 2009

  • 324 Answers

SOURCE: hp Laptop screen flicker

Good afternoon,

Got 2" of snow today. Oh, well! Spring is only 5 months away.

My suggestions, from least to most probable are:

1-LCD display cable, loose or damaged.
2-Lid close button, may be loose or bad.
3-LCD lamp.
4-LCD lamp inverter, connector loose or bad board.

Did this info help?
Ron-

Posted on Nov 21, 2007

mailtoravi
  • 186 Answers

SOURCE: hp Laptop screen flicker

I am sure that the issue is related to the cable that connects to the LCD Display or the LCD Backlight.
There should be some connection shortage because of which the LCD flickers few times as stated by dan231.
I Recommend you to get the Notebook examined as soon as possible before something really goes wrong...

Posted on Dec 06, 2008

jim4984
  • 797 Answers

SOURCE: It's a little over a year old. The screen will

Sounds like a loose connection at the inverter board. Laptops use an inverter to step up voltage to drive fluorescent tube(s). The problem could be at the inverter or at the tubes.

Posted on Mar 12, 2010

Minzuko
  • 100 Answers

SOURCE: grey, flickering screen

Possible LCD issue, but you have to check first in BIOS if the same symptoms.

If in BIOS doing the same it is already a mechanical failure.

If not? check all the connections and also try reformating the system.

Posted on May 19, 2010

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