Question about HP Pavilion dv9000z Notebook

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Screen wont light up

Power is on but the screen wont light up and every thing else seems to be ok

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Wafy_m, the problem can be attributed to the graphics chipset, is lifting off of the motherboard.
The mounting has loosened.

This is because the cooling system for the graphics chipset, is inadequate.

Chip and Chipset are slang terms for I.C.
Integrated Circuit,

The graphics chipset is the GPU,

The mounting of the GPU to the motherboard, is done with a BGA surface mount,

To explain a BGA surface mount, compare to an older Intel Pentium 4 processor, that uses a Socket 478 processor socket,

The Processor has contact pins on the bottom. 478 of 'em.
The Socket 478 processor socket has matching socket holes.

With a BGA surface mount there are no contact pins, nor socket holes.

In place of the contact pins there are Solder Balls.
In place of the socket holes there are Copper Pads.
(Which have a gold plating on them)

The graphics chipset is set into place over the motherboard, with it's Solder Balls lining up on the motherboard's matching Copper Pads.

Heat is then applied at a specific temperature, and length of time.
The Solder Balls melt, which solders the graphics chipset to the Copper Pads.
(Which in turn solders the graphics chipset to the motherboard)

With the inadequate cooling for the graphics chipset, after time the solder connections will begin to partially melt.

This leads to a poor contact of the graphics chipset to the motherboard, and the problem you are having.

As previously stated the cooling system for the graphics chipset, is inadequate.

Cooling System:
The cooling system consists of a Cooling Tube, Heatsink, and Fan Assembly.

The Cooling Tube is a slightly flattened copper tube, filled with Nitrogen, and sealed on both ends.

Towards one end of the tube is an aluminum plate. This plate sits on top of the Processor. Has four screws through it. Removing these screws removes the cooling system assembly.

Coming up the tube a little bit, is another aluminum plate. This one is smaller, and sits on top of the graphics chipset.

Connected at the opposite end is the Heatsink.
The Heatsink is a small thin piece of metal, with Tall, Thin, fins protruding from it.

Next to the Heatsink is the Fan Assembly.
The Fan Assembly, is a Fan inside of a cage, or shroud.

Draws air up from the bottom of the laptop, and pushes it through the Heatsink's fins, and out the side of the laptop.

Heat from the graphics chipset, and the Processor, are absorbed by their metal plates.
The Cooling Tube absorbs heat from the two aluminum metal plates.

The Cooling Tube transfers the heat along up to the Heatsink.
The Heatsink absorbs the heat, then radiates it away with the Tall, Thin fins.

Airflow from the Fan Assembly, helps to carry heat away from the fins of the Heatsink.

The surface area of the metal plate on top of the graphics chipset, is too small. It is inadequate in surface area size.

The one on the Processor is barely adequate.

The above is posted for reference. Pause the video at 7:43 to see the cooling system I described above.

1) Black Fan Assembly to the upper left.

2) To the immediate left side of the Fan Assembly is the Heatsink.
Black in color, slightly rounded outside edge, goes along the full length of the left side of the Fan Assembly. Hard to discern the fins.

3) The aluminum X shaped piece with 4 black screws in it, on the copper Cooling Tube, is the metal plate for the Processor.

4) Coming up the copper Cooling Tube towards the Fan Assembly, is the second aluminum metal plate. It is shaped sort of like an S, with flat ends. This plate sits on top of the graphics chipset.

Properly remelt the solder connections of the graphics chipset, to the copper pads.
Add surface area to the Processor's metal plate, and the graphics chipset's metal plate.

PROPER method is to use a BGA Rework Machine. Performed by a shop who has one.

ANY other method may is less than. The procedure may last a week, a month, or maybe longer.

There was a recall on this series of Notebook PC.
It is over,

[ No, replacing the motherboard does NOT cure the problem ]

For additional questions please post in a Comment.


Posted on Feb 18, 2012

  • joecoolvette
    joecoolvette Feb 18, 2012

    "ANY other method may is less than."

    Should be, "ANY other method is less than."


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