The number one issue with DV Series is:
Blank or No Video displayed.
The number two issue is: (tied)
No Wi-fi or Continuous rebooting
After repairing a number of HP DV Series laptops. I wanted to isolate the problem and make it easier for me to fix, and have them stay fixed! So digging deep into them I can only come to a couple of conclusions of why they fail.
1: Manufacturing - Hann-Starr
Either the oxidation on motherboard or the Graphics Chips. Since the failure comes in both versions AMD and Intel lines. And in Intel and nVidia GPU's it seems it could be at the factory.
2: Distribution - nVidia
Could the transit time and shipping packaging be contributing to the oxidation on the GPU? On one unit after a number of reflow failures, I decided to remove the GPU and prepare to 'reball' the chip. Then and only then did I notice there was no solder on some pads. So that points the finger to nVidia. Oxidation is the culprit since the solder balls are put on a the the GPU plant.
3: Bad Solder
I have heard claims from HP techs that nVidia got a bad batch of solder. But I don't believe that because the problem exists on DV2000, DV6000, DV9000, V6000, F700, C500 lines. Too many fabrication points for the same solder issue. As well as the number of years that this problem has been known.
Can they be fixed reliably? Yes
But it would require a good knowledge of solder's metallurgic properties, heat and manufacturing processes. The training I received from my previous employers helped quite a bit. And now repair them from various shops in the area as well as California, Ohio, Illinois and whoever can find my address or contact me.
Will I post how to permanently fix them? Not just yet.
This information will be posted in a technical manual. And people that want to learn how to fix them will have the option of getting a complete kit. Because I don't want them to fail, then blame me for not following directions.
How much did the tools cost altogether?
The cost of all the tools and equipment to fix the DV series was about $100 max. And the would include custom items made.
Blanket tricks and gimmicks
They work (sometime) but the result is not permanent and usually used as a 'get it out' solution. These units sometime wind up on eBay, Craigslist and other venues as 'working' units. But fail in a couple of days or weeks. This does nothing for the corrosion/oxidation which is the ultimate issue.
Tricks seen posted: Wrap in blanket, placing a tea candle on GPU, put in oven and other silly methods that unskilled/untrained hobbyists use
What can happen when it is done wrong?
The board can be rendered useless, shorted and a total mess. requiring replacement or reballing which is a time consuming, expensive and painstaking process.
All the solder under the GPU will tend to collect forming a large blob under the chip. Shorting GPU.
Adjacent caps, resistors, coils will be dislodged.
Fan connector will be burnt.
Wastes time, and will not be repaired or work
Presents or create another problem that will be difficult to determine.
Number of units repaired since Jan 1, 2010
Total units repaired
(update 3/23/2010) Now averaging 7-10 a week