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HP DV9410US Plugged in not Charging, and it just turns off for no reason

My HP laptop will not charge a Brand New Battery, and sometimes it will stay on for hours, and then other times it just shuts off for no apparent reason. I need help my daughter is homeschooled, and she needs this laptop for online school work...

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Greg, the Pavilion dv9000 series of Notebook PC's have several problems.
So many in fact, that HP had a recall on them.

However your problem may just be the laptop is dirty inside. Dirty enough, that using a can of compressed air from the outside, may not do the job.

If a Processor becomes too hot, it shuts off. (BIOS turns it off)
When a Processor exceeds it's thermal limit, it turns off so it will not burn up.
This is a fail safe feature built in.

However, there may be issues more than just the laptop is dirty inside;

ONE of the problems;
Graphics Chipset:

HP claimed it was due to the Nvidia graphics chipset, but in reality it is INADEQUATE cooling for the graphics chipset.
Poor cooling design. (Not Nvidia's fault)

Unfortunately the recall is over,

http://www.nvidiasettlement.com/index.html

To explain;

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

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

2) The I.C. used for graphics is a GPU, Graphics Processing Unit,

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

3) The GPU is mounted to the motherboard via 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,

http://en.wikipedia.org/wiki/Socket_478

The Processor has 478 contact pins on the bottom. The processor socket has 478 matching socket holes.

With a BGA surface mount there are no contact pins, nor socket holes.
Solder Balls take the place of the contact pins, and Copper Pads on the motherboard, take the place of the socket holes.

The chipset (Graphics chipset in this case), is set into place over the motherboard, with the Solder Balls lining up with the matching Copper Pads.

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

The cooling system for the dv9000 series consists of a Cooling Tube, Heatsink, and Fan Assembly.

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

At one end of the Cooling Tube are two small metal plates.
Near the very end, is a metal plate that sits on top of the Processor.
Coming up the Cooling Tube is another small plate, and this one sits on the GPU. (Graphics chipset)

At the other end of the Cooling Tube is the Heatsink.
Next to the Heatsink is the Fan Assembly.

Heat is absorbed from the Processor, and graphics chipset, by the two small metal plates.
Heat is then absorbed from the metal plates by the Cooling Tube.

The Cooling Tube transfers the heat to the Heatsink.
The Heatsink is a thin piece of metal that has Tall, Thin, fins protruding from it.

The Heatsink absorbs the heat from the Cooling Tube, then radiates the heat away with the Tall, Thin fins. (Same principle as a house radiator, or automotive radiator)

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

The cooling system is inadequate for the Processor, AND graphics chipset, but more so, inadequate for the graphics chipset, PERIOD.

With constant overheating of the graphics chipset, the solder connections of the BGA surface mount, begin to melt.
This causes a poor connection.

ALSO, it has been reported that the Electrolytic Capacitors on the motherboard, are a problem child.
Several reports of capacitor failure have come up.

Solution?

A) Cooling System:

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

NOT posted for advertising for the video poster. Posted for the reference material.

The best method Greg is to use a BGA Rework Machine.
All the other methods are sketchy at best. May last a year, or a week.

B) Visual identification of bad capacitors.
(Electrolytic, specifically. Plus, the Electrolytic Capacitors used are
Radial Aluminum Electrolytic Capacitors ),

http://www.capacitorlab.com/visible-failures/index.htm

Shown with desktop computer motherboards, but the principle applies to laptop motherboards, also.

To include,
HP Support > Pavilion dv9410us > Service Manual,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3439687&

In the list click on the file name -
HP Pavilion dv9000 - Maintenance and Service Guide

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the file name it may take up to 30 seconds, before the first page comes up.

WEAR an ESD wrist strap. Connect it's alligator clip to a good ground source.
(I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case.
No need for an ESD Antistatic Mat, IMHO)

Example of an ESD wrist strap,

http://www.radioshack.com/product/index.jsp?productId=2103245

Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components of a computer.

Use a multi-compartment container, for the various screws you will remove.
Label each compartment for the area the screw/s come out of.

Make a record as you disassemble. Make notes, drawings, and if possible use a digital camera, or video camera. (Use good lighting)

It's nice to have a Service Manual, and possibly a pictorial, or video, but even nicer to have a personal record, for your first time.
(Good to refer back to in case you are interrupted)

Post additional questions in a Comment.

Regards,
joecoolvette

Posted on Feb 11, 2012

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