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To explain a BGA surface mount; The older Intel Pentium 4 processors that used a Socket 478 processor socket, had contact pins on the bottom of the processor.
A chipset using the BGA surface mount does not have contact pins. It has Solder Balls in place of the pins.
There is no socket with socket holes. There are Copper Pads.
The chipset is set into place with the Solder Balls lining up on the Copper Pads. Then a specified temperature, and specified length of time is used to melt the solder balls. This solders the chipset to the Copper Pads, which in turn solders the chipset to the motherboard.
Excess heat, due to the laptop is overheating, can partially re-melt the solder connections made, and cause a poor contact.
May be caused by the laptop is dirty inside, and the cooling capacity of the cooling components, has dropped tremendously.
May be due to a poor cooling system design in regards to the graphics chipset.
The cooling system may be adequate enough to keep the Processor within it's specified temperature operating range, (Thermal Limit), but NOT adequate enough to keep both, Processor AND graphics chipset cool.
Using the HP Pavilion dv9000 series of Notebook PC, this video gives information on the problem in more detail,
2 Solutions Possible.
The connection between the LCD Screen to the motherboard is not connected well and is causing the issues you are having.
The screen itself needs to be replaced because it defective.
To make sure what is really wrong we need to break down couple of things, have you tried connecting a external source such as to a monitor or a tv via s-video or vga. If it is able to display to the external source then there is something wrong with your screen. Now is it completely dead and you cannot see anything or are you able to see something but the display lights are not litting the display. If that is so, then your backlit is dead and you will need to replace the entire screen. In my honest opinion if that is the case I recommend you to by a new laptop, because parts/labor cost would cost more then your medium powered new laptop.
I don't know that it is a common fault with this specific model, but laptops in general have this issue mostly due to a dying LCD power inverter. It is typicaly located at the bottom of the LCD screen and costs between $30 - $75 dollars for the part, and usually $75-$150 for someone to replace. If you like the laptop it is usually worth it to have replaced. You can also hook up a monitor to the VGA port on the laptop and then go into your display control panel and enable 2nd monitor to use it instead of your laptop lcd.
2 THINGS,one it could be the lcd cable has come loose behind the lid,
or the inverter is faulty.if your happy to take lid off an reseat the cable.
two.the screen cable maybe loose at the motherboard end.unplug power supply,remove battery,and unscrew keyboard,pull off cable an reseat the lcd cable.
So after a power up we can deduct that its not a hard drive problem because you have managed to successfully attach an external LCD screen to the system.
It may not nessacarily be the end , laptops are mobile machines and
time to time plugs and sockets don't hold their devices in place and in
your case most probably one of the two connectors on your laptops LCD
It could possibly be one of these 3 things
1. The ribbon connector which carry's the video signal to your LCD screen has become dislodged you will need to open up your laptop and check this and make sure its seated in its interface properly. This is usually located in the spine of the laptop
2. The power connector on the LCD screen itself which is a small black 3 pronged plug has become loose also open up your laptop and check this
3. when the computer has had time to boot press the fn + F6 on your keyboard , you may have to press this a few times but this is the manual LCD screen off and on button