The monitor screen on your laptop is an LCD screen.
An LCD screen cannot produce enough light by itself. It needs an additional light source.
The additional light source is a Backlight.
A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes and businesses, but on a MUCH smaller scale.
LCD screens are a composite of layers. The layers are held together by a metal frame, much like a picture frame.
The Backlight is usually located on one side, accessed after removing one side of the metal frame.
As stated, a Backlight is a very small type of Fluorescent lamp, (Tube)
Very fragile, easily breakable, and not usually approached by one who has very little, or no experience in replacing.
More common the entire LCD screen is replaced, which includes the Backlight already installed.
A laptop also needs an Inverter to provide power, both for the LCD screen, and the Backlight.
90 percent of the time the fault is the Inverter.
I repeat, 90 percent of the time the fault is a bad Inverter.
An Inverter is cheaper than an LCD screen, and MUCH easier to replace than a Backlight.
Allow me to show you replacing an Inverter on an HP Pavilion dv6000 series laptop.
Granted, it isn't an HP Compaq Presario V6500 series, but the principles still apply the same,http://www.insidemylaptop.com/remove-replace-lcd-screen-inverter-hp-pavilion-dv6000-laptop/
I can also provide a free link, to the Service Manual for an HP Compaq Presario V6500 laptop, direct from HP Support,http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=3369429&
In the list click on;
Compaq Presario V6500, V6600, and V6700 Notebook PCs-Maintenance and Service Guide
This is a PDF file.
Allow up to 30 seconds to see the first page, and an additional time may be needed to fully download.
In the Bookmarks menu on the left click on the + sign next to;
1) Removal and replacement procedures
2) Component and replacement procedures
3) Display assembly
And/or go directly to Page 61 to view the Inverter location.
One example of an Inverter for an HP Compaq Presario V6500,http://www.sparepartswarehouse.com/Compaq,Presario,V6500,Laptop,Inverters.aspx
Granted this is not what you asked for.
My premise is to teach, and hopefully save people money.
If you have additional questions please state in a Comment.