Feb 14 2011

Sony Vaio nVidia fix


I have a Sony Vaio laptop (model VGN-C1Z), which all of a sudden developed a serious illness. The screen was covered in lines during bootup, both the BIOS and Windows loading screens, then it would just blackout when Windows finally loaded. The lines over the BIOS screen told me it was a graphics card problem and being a laptop I feared the worst.  It turns out that I’m not the only one with this problem. The culprit here is the nVidia 7400 GPU. It seems that as the chip gets hot and cools down repeatedly, the solder bonds under the chip are weakened and eventually become faulty.

Now, it stands to reason that if the only error is poor solder connections, that I should be able to heat the chip up again and reflow the solder to create nice strong bonds again. Well to test my theory I booted the laptop, pressed F8 to get the windows boot menu and started in VGA mode. This let the laptop start Windows, albeit with everything looking huge due to the 800×600 resolution. Then I played helpful 720p videos until the laptop got very hot. A reboot later and the lines on the screen had disappeared! The laptop had magically resoldered itself. Sadly this didn’t last and the problem quickly returned.

Scews in bags

An easy way to keep track of the screws

I needed a more permanent fix, so I bought myself a heat gun and set about taking the laptop apart. Now a tip here is to get yourself a load of small plastic resealable bags. As I removed the screws I labelled a bag and put the screws in, so I might have a bag labelled ‘corner screws base’ with all the main screws from the base…obviously. Also, if you lay the bags out left to right in the order you took them out  in, then you can easily follow the order in reverse to put everything back together.

Sony Vaio Motherboard

Heatsink and motherboard

After removing all the base screws, taking out the HDD/DVD drive (there are 3 screws under the drive), you have to flip it over and take off the keyboard, which is secured by small clips along the top edge and has a flat plastic ribbon on the back which has to be unplugged. There are 3 screws under the keyboard, which when removed will allow the laptop to come apart nicely. You can then unclip the wires from the motherboard, unscrew it and take it out. Then you remove the heatsink and finally the faulty nVidia GPU becomes visible.

Sony Vaio nVidia Fix

nVidia chip is the medium sized one on the right

I took a piece of tinfoil and rubbed it over the GPU to give me the outline. Then I cut out a section of foil inside the outline and covered the motherboard so that only the GPU was showing. I set my heat gun to 400C and holding approximately 15cm away to start with heated the nVidia chip. I did this for about a minute then let it cool down, before repeating the process again a couple of times, just to be sure. I then connected the bare minimum back up to the laptop to test it and SHAZAM! no lines on the screen. Job done. It was then a simple matter to take the screws out of their little labelled bags in reverse order and put the laptop back together. I’m still using the laptop with no problems since.

Update – 5th June 2011: Added some pictures I’d taken of the process to make things clearer.

Feb 1 2011

Homemade Sausage Sausage Dog


2011 – the year of the sausage! or so it seems. Having received a sausage stuffing machine for Christmas, I spent most of my January weekends making sausages. The Sausage Sausage dog is the sequel to our Dalek Bread in our food with silly names series.

Sausage making is great fun, like all good hobbies it’s easy to pick up but difficult to master. Homemade sausages are easily more tasty than the cheap supermarket ones, and hopefully one day I’ll be able to make ones as nice as our local butcher.

The sausage sausage dog came from my third attempt, my first at a fancy sausage, namely pork and apple. These were much better than the first two tries earlier in the monnth, I had a better idea of the required consistency and soaking the meat for 24 hour in apple juice surely helped as well.

My guide through what i can legitimately call a sausage fest has been
The Sausge Book by Paul Peacock an excellant book that explains an awful lot (even how to twist and bunch them up). The skins I’ve been using are from this eBay store.

More Sausage making pictures can be seen in this flickr set. Sadly, things didn’t end well for the sausage sausage dog, he died due to a fatal frying pan related incident the following morning, just before breakfast :)