DV9000 laptop, lights come on for 1/2 sec then turns off

andyr76
andyr76 used Ask the Experts™
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Above laptop, you press the on button and the led lights flick on, the fan and hdd spin all for about 1/2 sec and then the laptop powers off.

I have,
tried each stick of ram individually
removed hdd
removed dvd
held button down for 1 min
tried with only ac adapter
tried with only battery

same thing each time

any idea?
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Sounds to me like you may have a faulty motherboard.  If possible you might want to pop open the case and see if any of the capacitors are expanded on the mobo.  
There also might be an issue with the CPU itself.  you may want to try re-seating that, you will need to re apply the thermal paste once you take the heat sink off the CPU.  Alcohol is a good way to get the paste off the CPU and heat sink.
If it still has a warranty make them fix it.  If not try the above.

Also sounds like a motherboard issue to me.
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Commented:
That's a common problem with that series laptop. It can usually be repaired (at least temporarily) by reflowing the video chip. There are many services offered on ebay that do this for under $100.
Commented:
Just like edbedb said it is a common occurence of that particular laptop. I've sent at atleast a dozen back to HP. There was a recall on those as you can see from this link on HP's website http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?&objectID=c01087277

However, I believe the recall is over and your stuck with a junk laptop.

Sorry to be the bearer of bad news. =(

Author

Commented:
Why do the lights flick on though for just a blink, i thought maybe a bad lid switch at first but it can't be that now.

Also if i take the mobo right out of the case including detaching it from the screen i should be able to just connect to the battery, or adapter, and start it up, ie the fans spinning, just like you would benching a desktop(mobo+ram+cpu+psu)??

Or do all cables need to be pluged in, maybe there are some grounds also that need the whole assemply to be in place??

Commented:
After a couple hours of taking it apart careful you could bench it. It doesn't need all the cables just the necessary ones to run the basics. Seems like a lot of work a head of you ending in disappointment.
The dv9000 series contain the Nvidia chip. This is most common cause of the faulty chip in last year. You may get the display after some time and not in other time. Stragely enough this many time is almost 90% time. You need to replace teh Nvidia chip in case it is faulty. there are some steps that can be done to temproary bring teh display back provided the the chip is not damaged too much but a minor crack only due to heat etc (Google interent for these chip and you know the reason).
Couple of things to try....it may boot up and you can view the display at some time and not on other time. Sadly the other time is in more than some time.

try this if it can help you a bit.... (not a permanent solution but may work)
Pull out the laptop batteries (remember it should be off while you do this)
open the laptop display unit more than 90 degrees (somewhat back side )
Put power cord and press the power button for arround 30 sec.  

see if it helps...(do a couple of try) , if my doubt is correct you display will appear at any time.
So check for Nvidia chip.
Check this also
 http://forum.notebookreview.com/showthread.php?t=345536

Commented:
To run the motherboard after it's removed you just need to have the CPU, heatsink and fan and at least 1 memory module attached and connect the power switch and power cable to the MB.
If it fires up you can test it further. Just connect the screen (or external monitor) and USB keyboard and mouse. Turn the MB upside down and place the hard drive on it. Then you can run it all day and fully test it.
That's what I do after having the chip reflowed.

Author

Commented:
Ok guys i have it on the bench, the motherboard is completely dissembled, 1 stick or ram, cpu, onboard nvidia gpu and power and still the lights just flicker, i have swapped the ram, resat the cpu and repasted the cpu and gpu.

So that is it, i am going to try and bake it in the over for 8min @ 385f, do i need to wrap it in kicthen foil, or will it be ok lying on a tray?

Author

Commented:
Holy Crap, it worked, i know have a laptop again..lol

I wonder how long it will stay working??
...it may boot up and you can view the display at some time and not on other time. Sadly the other time is in more than some time.

Author

Commented:
It has been working all night, very impressed, i am going to do the copper penny shim mod, for those in the uk should i use a 1pence peice or a 2pence piece?

Commented:
You should also flash the BIOS with the latest update. It will help to keep the GPU from running too  hot.

Author

Commented:
Yup i know about bios upgrade as it lets the fans stay on 24/7 i think.

Also does this baking method only work on HP or maybe just dv9000 series board?

I need to get the penny ground down right if i want to use it as a heatsink, i thought i would take it to keymaker today and see if he will grind it down.?

Commented:
The upgrade runs the fan at a slow speed 24/7 and speeds it up at a lower temp.

The reflow fixes most MB problems for the DVxxxx and TX series of HP laptops that use the Nvidia chipset.

I use the Furmark GPU stress test to check the GPU temps. I don't use the MB if I can't keep the temperature down to a reasonable level.

Author

Commented:
ughhh  got another problem now. The zif socket on the lcd panel has snapped ff, the small brown push in insertion force thing, so you slot the ribbon cable in and thing push each end of the brown zif in, well this brown zif has snapped so that the cable just pops out when slotted in, i was thinking some superglue, what do you think?

Commented:
Usually when they zif catch pops out you can place the cable in the socket and push in the wedge. Takes patience but it usually works. There has to be something wedged in to make the contacts connect.

Commented:
I'm really surprised that you got it to work. Perhaps something got spilled on it, which baking it could possible have solved the issue. very strange.

Author

Commented:
@nitro316.

I am not so suprised anymore after watching a couple of videos on youtube about reflowing, apparently a hairline crack can be fixed by this oven method.  I don't think anything was spilt, after more research on the dv9000 a lot of people are fixing their board doing this although a lot also say you get 3day - 3 months before it goes down again. So far it has been working great for 3 days, been doing some gaming on it and gpu temp doesn't go above 70C, still quite hot but just acceptable i would say.  

Author

Commented:
gd

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