The machine has faint video, no backlight, have already ruled out the inverter board and backlight. Has this model had problems like this, because I've also seen it in another one that we never could repair. Assumed it was motherboard and not worth the money.
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Well looks like your cfl tube is dead or the card powering it is dead. the easiest thing to do is to find a Laptop repair center, the can change either the backlight tube (like a neon tube really) or the inverter or the whole screen.
You might want to try it yourself if you find a working screen for your HP. Is is fastidious but not that dificult.
Here you can see a step by step tutorial on how to remove the screen for another Hp model.
In the example given there are 9 Backlights shown. Click on the Backlight images to enlarge)
An Inverter is used to change the power from the laptop, and provide power to the LCD screen, and Backlight.
90 Percent of the time the Inverter is bad.
An Inverter is a small circuit board, and is located behind the Bezel, and usually at the bottom of the LCD screen. (The thin plastic 'frame' going around the front of the LCD screen, is the Bezel)
If faint images are seen with the flashlight, replace the Inverter.
If you post the laptop's manufacturers name, and Model Number in a Comment, I may be able to give you a link to a free Service Manual detailing how simple it is to replace an Inverter.
I could also give links to possible choices for an Inverter. (The Model Number is on the bottom of the laptop)
2) If no faint images are seen there is a problem with the graphics. This could be due to something as simple as a Display Video Cable, or the graphics chipset itself. (Not so simple)
The Display Video Cable comes from out of the body of the laptop, and usually runs next to one of the hinges. It then leads up into the Display Assembly, and attaches to the back of the LCD screen.
Constant opening and closing of the laptop may have damaged the cable, or could have sightly unplugged it. The first thing to try would be to see if the cable's connector has come loose. The next thing would be to check the continuity of the cable, and if damaged replace the cable.
(The continuity of the cable can be checked with a multimeter set to OHM's. An economical multimeter can be purchased for as little as $10 to $12)
There is also a Display power cable that goes to the Inverter. With some laptop models it is incorporated into the Display Cable. This cable can be damaged by opening, and closing the laptop repeatedly, or become loosened, and slightly unplugged.
(Some laptops are designed where this is never a problem. Other laptops are designed where this can be a frequent problem. Poor engineering design)
2A) There are some laptops, specifically the HP Pavilion dv2000 series, dv6000 series, and dv9000 series that have a problem with the graphics chipset is overheated. Poor cooling design inside the laptop.
You might have either a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp.
If the laptop comes on normally otherwise and is booting to Windows (you hear the normal startup sounds), look closely at the display and see if you can make out a faint image. It often helps to shine a flashlight on the display.
If the display is faint but present, you probably have a bad inverter board in the display. The inverter provides power for the display's backlight, and without the light the display still works but you can't see it. Inverter boards are available for most brands, they're not usually very expensive, and changing one isn't too difficult. A Web search for your brand and model and "replacement inverter" should turn up several sources. There are also YouTube videos showing how to replace the inverter in many kinds of laptops.
It's also possible the backlight itself is bad. If so, replacing the display is usually preferable to trying to replace the light. The light is built into the display and it's very difficult to replace without damaging the part or the display in the process. The display can be expensive, though.
If you're not sure that the computer is working, try starting it with an external monitor connected. If there's no display then, there's something wrong with the system board that's preventing the machine from starting up. Get that fixed, and it will probably fix the display trouble as well.
The exact model number is necessary to determine the exact parts your TV has. Some models has suffixes in their numbers to indicate they have some differences in their parts. For example, the 42LG30 is different from 42LG30DC, 42LG30-UD and so on. But generally, there are three parts that has a direct connection with the dimming and illumination of the screen. These are the T-CON board or LCD driver, backlight and inverter or ballast. The T-CON board is responsible in driving the LCD panel to produce the appropriate video or image. The inverter or ballast provides power to the backlights to illuminate the screen. If one of these fails, you will not be able to see any image or video on your screen. The T-CON board is bad when there's a glow on your screen indicating that the backlight is on but there's no video or image. In short, the screen is blank. If the screen is black, no glow, grab a torch and shine it on your screen. You will be able to see a faint image if the T-CON board is good. This indicates that the backlight is off. Either the inverter/ballast is dead or the backlight itself is busted. But usually it's the inverter/ballast that has failed. You can tell that the backlight is busted if the TV is old enough that the mercury vapor inside the tubes has depleted. The T-CON board and the inverter or ballast are not serviceable and must be replaced completely if faulty. Replacing these boards can easily be done. Feel free to inform me if you find which of the above is the root of the problem to guide you in the fix.
If you already tried to adjust brightness and it didn't work, problem is backlight inverter which is part of DC board or it might be fuse on DC board related to inverter. Anyways, camera needs to be serviced.
First thing is to check if the video card is OK. Connect an external monitor to your laptop, if you get a clear image on this monitor then the video card in the laptop is OK. A faulty backlight could be caused by a defective inverter that supplies high voltage to the CCFL lamp or a faulty CCFL lamp. Most likely a faulty CCFL lamp.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills. Check out www.lcdparts.net for parts, repair service and DIY info.
Your inverter board is bad. They run anywhere from $30 - $80. They are very easy to replace. I have had this problem with three monitors and replacing the inverter board fixed the problem. Hard to say where you will find the part. Just do a search for 'inverter board' with your model # on any search engine.