This method should work for the following models: HP Pavilion dv2000, Pavilion dv6000, Pavilion dv9000, Compaq Presario v3000, Presario v6000, HP Pavilion tx1000, Pavilion tx2000.

By the way, I just fixed my son’s Xbox 360 with red ring of death (error 74) using exactly same technique.

MOST COMMON PROBLEM SYMPTOMS

1. Laptop turns on with garbled video on the internal laptop screen and external monitor.
2. Laptop turns on as normal but there is no video on the internal laptop screen or external monitor.

MY UNDERSTANDING OF THE PROBLEM

The NVIDIA graphics chip soldered to the motherboard. When the laptop gets very hot, the NVIDIA chip separates from the motherboard and laptop video fails.

HOW TO FIX FAILED NVIDIA CHIP

I have previous posts explaining how I fixed same problem by baking the motherboard in an oven or bubble-wrapping the laptop. But today I’m going to fix the motherboard using a heat gun. Basically, I’m going to heat up the NVIDIA chip with a heat gun to solder it back to the motherboard (reflow). I think this method is more reliable and the repair should last for a while.

WARNING!

There is no guaranty this method works all the time. While doing this repair you may damage the motherboard and make it unrepairable. Also, you may damage the laptop while taking it apart.
Proceed at your own risk and don’t blame me if you turned your laptop into a very expensive door stop.
If you don’t feel comfortable doing this repair, take your laptop to the repair shop.

HOW I FIXED THE MOTHERBOARD

First of all, you’ll have to disassemble the laptop and remove the motherboard. You can find laptop disassembly procedure in the service manual. If you having trouble finding the manual, leave a comment and maybe I can point you to the right direction.

In my example I’m using a motherboard removed from HP Pavilion tx2000 laptop.

In most laptops the graphics chip located under the CPU heatsink (and it has NVIDIA logo on it), so there shouldn’t be a problem locating the chip. The chip has a glossy top surface.

For this repair I’m going to use an Ecoheat heat gun EC-100.

In order to figure out how to position the heat gun and for how long, I tested it on a penny with a small piece of solder on the top.

The Ecoheat heat gun has a switch on the handle. There are two positions for the switch. Position 1 – slow. Position 2 – fast.
I used position 1 – slow.
I positioned the heat gun about 1 inch away from the penny and turned it on.

After about 40-45 second the solder started melting. After 50 seconds the solder melted completely.

To protect the motherboard from the heat I used a regular cooking aluminum foil. I cut off a piece of aluminum foil and folded it a few times to make my protection shield thicker. After that I cut off a square opening right in the middle, same size as the NVIDIA chip.

After I removed the heat sink, I had some old thermal grease stuck on the NVIDIA graphics chip. You can remove old thermal grease using alcohol swabs. It’s not necessary to make it perfectly clean. Just make sure there are no large chunks of thermal grease on the chip.

UPDATE: Some people mentioned that I should have applied some liquid flux underneath the NVIDIA chip for better results. I didn’t do it this time. I’ll definitely do it next time if the motherboard fails again. I found this video explaining how to apply liquid flux under the GPU chip. This video was made for Xbox 360 motherboard but should apply to any laptop motherboard too.

Liquid flux for GPU reflow available on eBay.

Finally, I positioned the heat gun above the NVIDIA chip about 1 inch away and turned the heat gun into the position 1.

After 50 seconds I turned it off and let the motherboard cool down for about 20 minutes.

Don’t forget to apply new thermal grease on the NVIDIA chip when you install the heat sink.
Some laptops use thermal pads instead of grease. If that’s the case with your laptop, make sure the thermal pad positioned correctly.

After I assembled the laptop back together, the video started properly!
The NVIDIA graphics chip problem fixed!
Will it last for a long time? I don’t know. Still testing.

Most likely this problem is heat related. Take a look at the following picture.

Any laptop has a cooling module which consists of heatsink and cooling fan. When laptop is working, the processor (CPU) heats up and because of that the heatsink is getting hot too. At some temperature level, the fan kicks in and cools down the heatsink.

The problem starts when the laptop cooling module collects too much dust inside. Usually dust collects between the fan and heatsink. Dust clogs the heatsink and kills normal airflow inside the cooling module. Eventually, the processor gets very hot and the laptop turns off unexpectedly or freezes. This problem can be fixed by cleaning the laptop cooling module.

Cleaning laptop cooling module.

Some laptops give you an easy access to the heatsink and fan. In laptops like that you can access the cooling module through the bottom cover.

In my example I had to remove the cooling module. Otherwise, I wouldn’t be able to remove the fan and access the heatsink. In some laptops you can remove the fan without separating the heatsink from the CPU.

After I removed the fan, I found a thick layer of dust inside the heatsink. Cleaning the heatsink should fix any heat related problems.

Apply thermal paste on the processor.

If thermal paste on the processor dried out, you should replace it with fresh thermal paste.

Remove old thermal paste from the processor and heatsink using alcohol swab.

WARNING: In some laptops the heatsink also covers the graphics chip. The part of the heatsink which covers the graphics chip might have thermal pad on it instead of regular thermal paste. Do not replace thermal pad with thermal paste! Do not apply thermal paste on the thermal pad! Just leave thermal pad alone and apply thermal paste only on the processor.

I usually use Shin-Etsu thermal paste which is relatively cheap and performs well.

After applying new thermal paste, install the heatsink and fan back into the laptop. Do not forget to connect the fan cable to the motherboard!

What if cooling module cannot be accessed easily?

In some laptops the cooling module is buried deep inside the case and cannot be easily accessed and removed. In order to remove the cooling module it’s necessary to disassemble the whole laptop but it’s only for experienced users.

In laptops like that you can use the following technique:

Buy a can of computer compressed air.
1. Blow air into the fan grill on the bottom of the laptop.
2. Blow air into the grill on the side of the laptop.
Switch direction a few times until all dust is gone. Most likely this quick cleaning will fix your laptop overheating problem.

Here are some HP models affected by this known video failure problem: HP Pavilion dv2000, dv6000, dv9000, tx1000 tablet PC, Compaq 700, v3000, v6000 and probably some others.

If you know more models, please mention them in comments after this post.

CAUSE OF THE PROBLEM:

As I know, the video problem somehow related to NVIDIA chip located on the motherboard. Overtime the NVIDIA chip separates from the motherboard and the laptop video fails.

SYMPTOMS OF THE PROBLEM:

When you turn on the laptop, all LEDs light up but there is no video on the laptop screen or external monitor. The laptop screen remains completely black and blank. The cooling fan spins as normal, on some models it stars spinning right away on other models after some time.

I found this trick mentioned by Walliot (comment 85) in this post. This trick called “towel fix” and used to fix “no video” issue in xbox360.

HOW TO FIX:

1. Remove laptop battery and hard drive.
2. Plug the AC adapter and turn on the laptop. Make sure the laptop is actually on, all LEDs should work.
3. Wrap the laptop with towels so all air intakes are closed.
4. Keeps the laptop wrapped in the towel for about one hours.
5. Unplug the AC adapter from the wall the let the laptop cool down (do not touch it for a while).
6. Unwrap the laptop and try tuning it on.

I didn’t really believe that this trick might work and tried it just because of curiosity but… IT WORKED!!!!

LAPTOP #1. HP tx1000 Tablet PC.

First, I tried this fix on a failed HP tx1000 Tablet PC.
I didn’t have paper towels at work but I had plenty of bubble wrap.
I closed the laptop in a tablet mode (with hard drive and battery removed), plugged the AC adapter and wrapped the laptop properly in bubble wrap.

After that I just waited for about two hours and unplugged AC adapter from the wall.
Waited for about 30 minutes and tried turning it on.
Success!!! The laptop started with video.

I just couldn’t stop and tried the fix on another failed laptop.

LAPTOP #2. HP Pavilion dv6000.
This is a different model with very similar failure symptoms. It turns on, all LED lights work but there is no video.

This time I didn’t something extra. To make sure there is no cool air coming into the laptop though bubble wrap, I closed all air vents with sticky tape.

After that I turned on the laptop from AC adapter (again with hard drive and battery removed) and wrapped the laptop base with bubble wrap.

The laptop was running like that for about 60-70 minutes but then I noticed that all LED lights went off. Not sure what happened, maybe the laptop overheated too much and shut down on its own. Anyway, I didn’t touch it for about 30 minutes and let it cool down.

My fix was successful again! The laptop turned on with video and booted to the desktop.

HOW THIS FIX WORKS:

Here’s my understanding of how this fix works.
When you run a laptop wrapped in towels (bubble wrap in my case), it gets very hot because there is no air circulation inside the heatsink. The heatsink and GPU (NVIDIA chip) run so hot that it melt solder between the chip and motherboard and the video chip gets resoldered to the motherboard.

Now I have to test for how long this fix last.

RELATED POSTS:

In one of the previous posts I explained how I fixed failed video chip by backing the motherboard in an oven.
In one of the following posts I explain how to reflow failed NVIDIA graphics chip with a heat gun.

It was Toshiba Satellite A70-S249 notebook with the following problem.
When I press on the power button, the laptop starts up as usual and a red Toshiba logo appears on the screen. After a moment the logo disappears and the screen turns black without any faint image and flashing cursor. The blue light around the power button stays on and fans continue to spin normal but nothing appears on the screen. I noticed that the hard drive LED blinks green on the startup and after that shows no activity at all. After a closer inspection I noticed that the screen is not completely black (like dead black), it didn’t have any image on it but it had a very faint backlight (I would say about 3-5% of normal brightness). I was able to see that there is some backlight after I pressed on the lid close switch and the screen turned to completely black.

Here are my troubleshooting steps that I went through to find the problem.
First of all, I replaced the memory module and didn’t get any changes. Removed the wireless card, still had the same problem.
After that I removed the hard drive and started the computer. This time I got something. The notebook successfully passed the Toshiba screen and started looking for a boot device. I got some activity on the screen. To make sure that the notebook itself works fine, I booted it from Knoppix (live Linux CD) and successfully loaded the Linux operating system to the desktop. So, that’s the hard drive problem!
I installed the hard drive back in the laptop and tried to boot it again. The same failure occurred again; I got a black screen with a very faint backlight and no hard drive activity at all. I tested the hard drive with Hitachi DFT test and failed an advanced test. The problem is detected!
Finally I installed a new hard drive, reimaged the drive with a recovery DVD and got the laptop back up and running.

By the way, even though the customer’s hard drive failed the DFT test, I still was able to access it from another computer. The customer had important personal files on the failed drive. I connected it to our recovery desktop computer using IDE adapter. The “failed” hard drive was detected without any problem and I was able to recover the data.

“Laptop shuts down on power up. When the power button is pushed, the laptop flashes green lights for several seconds and then powers down. Unit will not stay on with battery or when plugged in”.

I plugged the AC adapter and tried to turn on the laptop. After I pushed on the power button, fans started spinning and were active for a few seconds and laptop just turned itself off. The video never came on. I tried to power it on for a few times with the same result.
Here is how I fixed it.
First of all I tried simple stuff: remove the battery and start the laptop with AC adapter plugged in, reseat and swap the memory module, remove the hard drive, the DVD drive, the wireless card. Nothing helped to start the laptop normally. After that I went a little bit further. I opened up the laptop case, removed the LCD screen assembly and reseated the video card and… Surprise, surprise, the laptop started fine with an external monitor attached. Just in case I restarted it 3-4 times and each time I got video on the screen. After I assembled everything back, one more surprise was waiting for me. The laptop failed to boot again with the same symptoms. So, the only part that I added before it failed was the LCD screen assembly. I unplugged the video cable from the system board and the laptop started fine again with the external monitor. Now I know that the problem is somewhere inside the display assembly (of course, if the video connector on the system board is fine). The next logical step would be opening up the LCD display assembly and check if all connectors are seated properly. Bingo!!! I wasn’t very surprised, but I was very happy. The video cable was half-way out from the connector on the back of the LCD screen. The laptop started perfectly fine as soon as I plugged the video cable back in place. Fixed!
That was my first experience when improperly plugged video cable prevented entire system from booting.

Read more:
How to troubleshoot and fix laptop video problems

Laptop has bad video on the LCD screen. What is wrong?

HP Compaq laptop manuals

The laptop failure symptoms:

The laptop will not turn on when I try to start it from the battery. When the laptop is turned off and plugged into the AC outlet the battery charge LED doesn’t light up. I know that the battery is not charged and the LED should light up when I plug the laptop into the AC outlet. The laptop starts fine when it is plugged. When I move the mouse over the Toshiba Power Icon in the lower right corner, the balloon will pop up and there is a line in there: Battery Remaining: N/A.

The problem repair procedure:

You can easily fix the problem just by updating the BIOS. Toshiba says that the BIOS version should be at least v1.30. So, go to Toshiba website and click on Downloads. Select your laptop model and find any downloads for the BIOS. In the BIOS change history you will see the description of changes.

After I updated the BIOS, the battery charging problem disappeared.

ERROR
Windows could not start because the following file is missing or corrupt:
System32\Drivers\ntfs.sys

I started the laptop and got the above mentioned error right away. Restarted it again and on startup a different file was missing:

System32\Drivers\pci.sys

If you search on the internet for these errors you will find a lot of tips how to fix it. Unfortunately, on most websites this error is mentioned only as a software problem. They say that you can fix it if you replace corrupted files from a Windows CD using a recovery console. I guess in some cases you can fix the problem by replacing corrupted files, but from my experience I know that these kinds of errors are very often caused by a faulty memory module.

I started testing the memory on the laptop with Memtest 86+ utility and the memory failed right away. The laptop had 2 memory sticks installed. I tried to eliminate a bad stick by removing and installing modules one by one into different slots on the system board. The same pattern occurred on startup:

- the laptop booted to Windows fine when only slot 1 was populated (tried both memory sticks)
- the laptop wouldn’t boot at all (there were no video) when only slot 2 was populated
- the laptop booted with a missing file error when both memory slots were populated

Unfortunately, it this case the error was caused by a defective memory slot on the system board, not just a bad memory stick. To fix the problem I had to replace the entire system board.

Conclusion: if you get a missing file error on startup and replacing the corrupted file doesn’t help, check the memory sticks on your laptop.

“My DVD drive is not operating properly. It can play music CDs but when it plays DVDs the video and the sound are distorted.” It was my customer’s complaint about his Toshiba Satellite L25-S1215 laptop.

The following laptop troubleshooting steps helped me to fix the problem. The laptop booted to Windows pretty fast without any errors, with a normal hard drive sound and spinning CPU fan. I restarted the laptop couple times and didn’t notice anything abnormal. I tested the optical drive with a generic data CD and a DVD movie. The drive recognized the data CD and all files on it but refused to play the DVD correctly. The video and sound output from the DVD movie was choppy, skipping scenes. It looked like a defective DVD drive and I ordered a replacement from Toshiba under warranty. I was pretty sure that a new DVD drive will fix the problem, but it didn’t. After I replaced the DVD drive the same problem occurred right away. The laptop had 256MB memory installed and 64MB were reserved for the video memory. I blamed a lack of memory and installed an extra 512MB memory stick and it didn’t help either. My guess about a corrupted video driver was wrong too because after I downloaded and reinstalled the driver the DVD video still was distorted. In cased like this, when we are not sure what is causing the problem the software or the hardware, we always install a test hard drive and reload the original factory software. I installed a test HDD and reloaded Toshiba Satellite L25 restore CD. After that the problem with a distorted video and audio output was fixed and I was able to play the movie for 2 hours without errors. Most likely, the problem with playing DVD occurred because of corrupted software.

If you have a similar problem with your laptop, do not rush to replace the DVD drive. Backup the important data and run a restore CD, it might fix your problem.

Related posts:
Toshiba Satellite M45 laptop freezes up after playing a DVD movie for about 30 minutes to an hour

So, the laptop didn’t fail with my memory stick installed into both memory slots on the system board. It means that the memory slots on the system board are good and the system board is good itself. Now it is time to test customer’s memory. I installed my 512MB memory stick in slot 1 and first customer’s memory stick into slot 2 and put the laptop on my bench to play a DVD movie. The laptop didn’t fail for 1 hour. After that I installed my 512MB memory into slot 2 and second customer’s stick into slot 1 and started the movie. The laptop didn’t fail again. OK, both 1GB memory sticks work fine with a combination with my 512MB memory, but do not work together. For some reason the laptop can manage 1.5GB of memory but cannot manage 2GB. Oh man! I do not know why I didn’t do it before, may be I didn’t sleep enough at night. Only after I spent all these time troubleshooting memory sticks, I decided to check Toshiba website for a new BIOS updates for this laptop. The laptop had BIOS v1.0 and this version was not even listed on Toshiba website. I guess it was some kind of pre-production version. The current version was 1.10. After I updated the BIOS I didn’t see the problem with the video output anymore.

Attention!
Before you spend time troubleshooting a good working hardware, CHECK for BIOS updates first. It helps a lot.

We see these kinds of laptops every day and this one didn’t look scary from the beginning. As I always do, I started the laptop waiting for the problem to occur. The laptop booted to Windows fine but much slower than an average unit. During the boot process I was listening for an unusual sound from the hard drive. It was a little bit loud; but nothing critical like a grinding sound. After the notebook booted to Windows, I tried to play a DVD movie and it took me more then 2 minutes to open WinDVD player software. It took one more minute to start playing a DVD movie. The video and the audio output were choppy. Replacing the DVD drive didn’t help. I was blaming the hard drive and started testing it with Hitachi Drive Fitness Test but it didn’t fail. Just in case I installed a test hard drive and reloaded the original factory software. Same problem occurred right after I rebooted the laptop. I tested the memory with Memtest 86+ test. It took me over 2.5 hours to test 512MB of memory but it didn’t fail the test. Usually this test runs much faster. Just in case, to make sure that the memory is not a culprit I swapped both memory sticks with a good known test memory but it didn’t fix the problem. After I excluded the hard drive and the memory I guessed that overheating was a problem because the laptop was running hot. If a laptop runs slow, I always check if the CPU heatsink is clogged with dust and lint. In this case cleaning up the heatsink, regreasing the CPU and reflashing the BIOS to the latest version didn’t help either. OK, I tried all easy stuff, now it’s time for hardcore. I started removing parts one by one trying to narrow down the problem. I removed the modem card, wireless card, DVD drive and left only the system board, the CPU, a good know hard drive with a fresh Windows load and a good known memory stick. The laptop still was running slow. After 4 hours I gave up. After I excluded almost every possible part, it must be a bad system board or a bad CPU. Replacing any of these parts wouldn’t make any sense because it would be more expensive than eBay price for a similar working laptop. I called to the customer and explained the situation and he just declined repair.