Question about IBM ThinkPad T40 2373 Notebook

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T42p will not start up

You talk about mother board flexing and the processor beineg separated from its mount. You said there are some solutions on U tube but I couldn't find them. Please Help

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The graphics chip can come loose. It's located under the keyboard, about where the space bar is. You can try pressing down firmly, but gently, on that area and see if it pops it back into place. You can also remove the keyboard and press directly down on the loose corner, very very carefully. If it starts, you may have to repair that solder point, or use a wedge of some sort to hold the chip down.

Posted on Nov 24, 2008

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Nvidia 8600gt 512 MB chipset is not working in my DV9700t HP pavallion laptop. Same model is not sold here so HP autorised service centre could not repair it, also this laptop was not having world wide...


The Nvidia GeForce 8600M GT chipset isn't the problem. It's the cooling system.

The cooling system is inadequate. It cannot cool the Processor, AND the Nvidia GeForce 8600M GT chipset properly.

HP knows this.

When the Nvidia GeForce 8600M GT chipset overheats, it comes loose from it's motherboard mounting.

The method of mounting the 8600M GT is connected in a BGA mount.
Ball Grid Array.

To explain:
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http://en.wikipedia.org/wiki/Integrated_circuit

B) GPU = Graphics Processing Unit

http://en.wikipedia.org/wiki/GPU

The GPU is mounted on a small circuit board, and then the circuit board has a method of mounting to the motherboard.

With a Processor, the chipset is also mounted on a small circuit board. On the bottom of the circuit board are pins. These pins go down into socket holes in the processor socket.
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Instead of pins for mounting, there are round solder balls on the bottom of the small circuit board.
On the motherboard area that the circuit board is to be mounted to, there are a matching number of copper pads.
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The circuit board with it's solder balls, is set into position on the motherboard with it's copper pads.
Heat is used to melt the solder balls, and they solder to the copper pads.

http://en.wikipedia.org/wiki/Ball_grid_array

The cooling system in the HP Pavilion dv9700t Notebook PC (Laptop) consists of a Fan/Heatsink Assembly.

The fan draws air up from the bottom, and pushes air through the fins of the Heatsink.
The Heatsink is attached to a long copper tube.
The copper tube has two flat copper plates on it.

One copper plate sits on top of the Processor's case.
The other copper plate sits on top the GPU chip.

Heat is drawn from the Processor, and from the GPU chip to the copper plates. The heat is then transferred to the copper tube, and then to the Heatsink.

It's a POOR design.

NOT having worldwide warranty? Oh?

Watch the entire video. Also states a method to fix the problem.

http://www.youtube.com/watch?v=bnkQNmKauEc

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2 Answers

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1 Answer

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Does it happen at a consistant time? Then check the power settings for the computer (screen saver and time to blank the screen.
Also, usually have a little latch of some kind that operate a tiny switch that turns off the backlight when you close the cover. Perhaps this switch is stuck on yours and the laptop may think you have close it. To find it, you must look for either a little spring loaded plunger on the keyboard side, or an opening on the keyboard side that something on the cover inserts into. All laptops have it, but they are all different. When you find it, push on it to verify it works.

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try reseating the memory and replacing with spare if u have any uses ddr

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6 Answers

Any touch will freeze my laptop IBM Thinkpad T42


There is a common problem with this machine; the mother board flexes and the processor mount partly separates from the motherboad. You tube posts a couple of solutions but they involve taking the laptop apart and applying heat from a heat gun to resolder the mount; it is not a solution for the faint hearted. Thinkpad/Lenovo might consider reparing the unit as it is basically a desgn/production defect but don't hold your breath.

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