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Old 04-13-2010, 02:11 AM   #1
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Default Eaglecorps911 laptop repair blog.

Hello all, I received fellow CF user EC's laptop for repair tonight. So I decided to make an active blog about it.

The complaint is the laptop keeps shutting down on it's own. I suspect an overheating problem maybe perhaps a bad fan.

HP Pavilion DV9000 running Windows 7 Ultimate.

We begin... now!

1) Wiped down the laptop since it was dirty.

Turned on the laptop. Boots up and logins just fine except for it taking 45 seconds to POST. Goes into stanby and turns on just fine. I went ahead and poked around inside, reseated the RAM and started the computer up. Oh noes! Now it doesn't POST.

2) Laptop still won't POST. Removed the hard-drives and booted up UBCD. Doing a memory test

3) Experiencing random shutdowns during memory test. I'm running it again while monitoring it a little more closely. If I have to, I might just pull one one stick of RAM and test them individually.

Click image for photo album.


4) Memory seems to be ok. Still doing random shutdowns. I'm going to try to see if it's overheating by monitoring the CPU temperature.

5) Memory is good. Hard drives are good. The issue lies somewhere between the motherboard, CPU, and the Nvidia graphics.

Anyone have any ideas why it constantly does random restarts. It's being very sporadic and may or may not be a cooling issue. The fan works just fine. I've opened it up so I can poke around a bit but I'm not going to go all the way. I think I'll put it back together and see from there.
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Old 04-14-2010, 02:13 AM   #2
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Default Re: Eaglecorps911 laptop repair blog.

Sounds to me like the northbridge is overheating.

I could be wrong though, but it definitely sounds like some sort of chipset issue.
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Old 04-14-2010, 02:21 AM   #3
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Default Re: Eaglecorps911 laptop repair blog.

All the chips are on the reverse side of the board that is covered. But there is one that I do have access to. A Nvidia chip. Would this be the northbridge? No heatsink but I still wonder what it is.

I tried Googling the numbers on it.

S705033
0721A3
GT610.1

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Old 04-14-2010, 02:43 AM   #4
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Default Re: Eaglecorps911 laptop repair blog.

I doubt that that is the northbridge.

Get some system specs from CPU-Z, then run everest and see what temps are like for every component, not just the CPU.
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Old 04-14-2010, 05:40 PM   #5
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Default Re: Eaglecorps911 laptop repair blog.

I'm going to move this to the hardware section.
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Old 04-14-2010, 05:52 PM   #6
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Default Re: Eaglecorps911 laptop repair blog.

I'd put my money on the processor. If it's random, it's probably an overheating issue. Are you using any software to monitor the hardware? If so, what are the results?

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Old 04-14-2010, 07:15 PM   #7
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Default Re: Eaglecorps911 laptop repair blog.

Quote:
Originally Posted by Legodude522 View Post
All the chips are on the reverse side of the board that is covered.
Negative. HP hides the CPU, Northbridge and GPU under the keyboard. In order to remove the heat-sink to replace thermal compound (at least easily) you will need to remove the keyboard, LCD and top cover.
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Old 04-14-2010, 08:01 PM   #8
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Default Re: Eaglecorps911 laptop repair blog.

Quote:
Originally Posted by celegorm View Post
Negative. HP hides the CPU, Northbridge and GPU under the keyboard. In order to remove the heat-sink to replace thermal compound (at least easily) you will need to remove the keyboard, LCD and top cover.
For this one, it's on the bottom side. Not the side with the keyboard. Unless you are claiming it's under the black tape. But I'm assuming it would be on the side that has the heatsinks.

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Old 04-15-2010, 03:09 PM   #9
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Default Re: Eaglecorps911 laptop repair blog.

HP DV series laptops have the CPU mounted on the back of the board.

DV series laptops are notorious for having graphics issues. The most common, is a no-post black screen but everything else comes on. This can be fixed by removing the motherboard and stripping it to chips only (removing heatsinks, extra wires, etc.) and applying heat from a heatgun to "re-solder" or re-flux the video chip back onto the motherboard. I have fixed 3 DV series laptops with this method, all 100% successful and a co-worker of mine did it yesterday with my help.

In this situation, it's possible the video chip is getting too hot and warping thus causing microscopic open circuits in the solder.

So, give the heatgun fix a try and see what you end up with.
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Old 04-15-2010, 03:56 PM   #10
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Default Re: Eaglecorps911 laptop repair blog.

Graphics chips wouldn't cause it not to post. You'd simply have no display.
My dv6205us has no such issue. But then it has an Intel graphics chip. I'd look elsewhere. Have you run with just the battery or just the power pack and see what it does? Have you test the bios battery?
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