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=3747188Click 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.htmlWires 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.htmlCable 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.htmlhttp://www.ccfldirect.com/lcdtutorial.htmlContinued in Comment.
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