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Some HP Pavillion DV series have the issue of not starting up( screen is Black), lights are on, then it restarts over and over again.<br /><br />The solution is:<br /><br />Disassemble(open up) the Laptop with right tools.<br />When you get to remove the fan on top of the processor, you will see the processor and next to the processor an intergrated graphics card.<br /><br />Remove the processor.<br />Remove the Ram.<br /><br />What you do now is Get a hair blow dryer, set it to maximum hot air and blow 1 cm distance from graphics card for about 5 minutes.<br /><br />let it cool for 20 minutes.<br />Put back all components.<br /><br />start the POWER. wait and now your pc will show something like magic on screen..
With a BGA surface mount there are no contact pins, nor socket holes. In place of the contact pins are Solder Balls. In place of the socket holes, (And socket), are Copper Pads. (The copper pads are gold plated)
The graphics chipset with it's Solder Balls on the bottom, is set on the motherboard lining up on matching Copper Pads. Heat is then applied at a specific temperature, and length of time.
This action melts the solder balls, and solders the graphics chipset to the copper pads. (Which in turn of course, solders the graphics chipset to the motherboard)
The cooling components for the laptop consists of a Cooling Tube, Heatsink, and Fan Assembly.
Click on the image of the thermal cooling assembly to enlarge.
The Cooling Tube is the slightly flattened curved copper pipe that you see. It is sealed on both ends, and filled with Nitrogen.
Note the irregular shaped metal plate attached to it on the right, and smaller metal plate on the left, near the Fan Assembly.
The larger irregular shaped plateto the Right, sits on top of the Processor. The smaller plate sits on top of the GPU. (Graphics chipset)
The Fan Assembly is the black curved fan blades you see, (Fan), and it's surrounding black D-shaped shroud.
In the front of the Fan Assembly is a rectangular finned Heatsink.
Heat is absorbed by the two metal plates sitting on top of the Processor, and graphics chipset. The heat is then absorbed by the Cooling Tube.
The Cooling Tube transfers the heat up to the Heatsink, and it radiates the heat away with it's thin fins. The Fan Assembly helps carry heat away from the fins of the Heatsink.
The area of the small plate of metal sitting on the graphics chipset, is too small. Cannot properly keep the graphics chipset cooled.
(The Processor and the graphics chipset, are the two hardware components inside a computer, that give off the most heat)
With inadequate cooling the graphics chipset overheats. Remember those Solder Balls, and when they melted they made a solder connection?
They start to partially melt. Soften up. Then when the laptop is turned off they re-solidify. This creates a Cold Solder Joint. (Solder connection = solder joint)
A cold solder joint creates a bad contact. In this case, a bad graphics chipset to motherboard contact.
Can it be repaired? Sure. But if the cooling surface area for the graphics chipset is not increased, you will be right back to square 1 where you are now. Without increasing the surface area it's just a temporary fix.
This is one tech's idea of how to permanently cure the problem. I'm not advertising for him. I don't advertise for anybody. It's for reference.
I believe the best method is to use extra surface area as he has shown, but use a BGA Rework Station to properly resolder the graphics chipset, back to the motherboard.
I will say I read in one of this gentleman's videos, that he also believes the best method is to use a BGA Rework machine. (He has three videos specifically dealing with the Pavilion dv2000, dv6000, and dv9000 series of Notebook PC's)
The DV6000 is a moniker for an entire series of laprop computers, each with a unique model number that has some variation the DV6XXX. Some will have Intel Core Duo, some Intel Celeron, some AMD Turion 64, and some AMD Mobile Sempron processors. Features, speed, and cost will vary appropriately with the Obviously the AMD and Intel boards are different and you cannot swap processors between boards. Here is a link to the HP Maintenance Manual for the DV6000 series laptops. It lists all the Mainboards used with the series and what processors go on them. It is useful for ordering replacement parts and gives instruction on disassembly and repair.
As the symptom you indicated above it is the problem with your LCD Panel. It is to be replaced to sort out this issue. To check and confirm the functionality of your Laptop motherboard plz check the Laptop with external display.
From what you are describing, the motherboard has failed. I would however like you to try a couple of things though. First remove the hard drive and see if the computer will go to the BIOS screen. If it does not, then the Motherboard has definately died. If you can get to the BIOS, then you might consider a hard drive failure, or your windows installation is so corrupt, it is causing this problem. I would however lean toward a bad MOBO....seems this model, the DV6000 and the DV9000 have serious cooling issues and tend to burn their mobos up. HP recently started updating the BIOS files for these models so the fans and processor run more efficiently to keep the laptop cooler.
Try it without the rechargable battery connected sometimes the battery shorts and causes problems. Do you have FN[function] keys at the left side. touch FN key with something else and see if screen comes back.Sometimes you can turn off the screen to send it to the back connected monitor.Connect (extra if you have) an external monitor to the back (vga) connector.If that shows, then you have to ""flutzz" with the FN(function) & F1-F12 keys