Trouvé ceci qui rejoint mon point de vue :
http://www.ebay.fr/itm/Dell-D630-D [...] 541wt_1027
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DIY Motherboard Repair Guide
Don't Replace The Motherboard, Fix it.
Complete Step-by-Step DIY Guide with Unique reflow method on How to fix common video display issues on Dell D630 D620 and many other makes and models.
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This Proven Reflow Method Works on IBM, DELL, SONY, GATEWAY, MICROSOFT, and APPLE
Works on Nvidia, ATI, VIA, and Intel GPUs
This guide is a must have for anyone who wants to fix the video issues by themselves.
A must have tool in any computer technician's toolbox
Once you've learned this method you can apply it on other laptops as well as video game consoles.
What's causing all these issue?
The failure is associated with the Nvidia graphics processors (GPU) due to a manufacturing defect in the graphics chip packaging. A weak die/packaging material set, which may fail with GPU temperature fluctuations. If your GPU fails, you may see intermittent symptoms during early stages of failure that include:
Random characters on the screen
Lines on the screen
Pixelated images
Wireless card not detected by the motherboard
Most common issues caused by the fault graphic/GUP chip.
One long beep 2 short beeps when powering on the laptop.
There is no video on the computer LCD panel or external monitor.
Screen comes on but shows multiple images. Function + F4 will not switch to external monitor.
There is no video on the computer LCD panel or external monitor. The notebook has power and active LEDs.
The notebook does not start. It powers on and goes into a restarting loop.
Laptop power panel light s up, beeps then shuts down
Screen comes on but shows multiple images. Function + F4 will not switch to external monitor.
The external monitor functions but there is no image on the notebook LCD panel. (check out the LCD troubleshooting flowchart on this one)
May also cause the following issues on some models. Note: Issues listed below may not be related to the faulty GPU.
Laptop will turn on but won't stay on.
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