What can you do, when your video card stopped working?
When you warm up the graphics card from below (under the chip), try to keep the hairdryer perpendicular to the plane of the textolite, otherwise I could not shoot and warm at the same time. Also, do not touch the small components of the card located on the rear side (you can easily shift them, taking into account the hot solder under them).
In the video above, I did not show the whole procedure, as you understand. From the bottom it is necessary to heat long enough (3-5 minutes), so that the smoke from the flux, which you could notice, began to rise quite intensively above the board (this is evidence that the board has warmed up well). The first stage will be “boiling” and bubbling flux – this is normal.
Also do not hesitate to warm up the space under the crystal itself (you can do it through the board). The main thing: do not delay the hair dryer in one place – smoothly move it around the area (to exclude places of local surface overheating). Keep the bell of the hair dryer at a distance of 2-3 centimeters from the surface to be treated. I personally put the flow of air at an average value, the temperature that shows the soldering station – 420-450 degrees Celsius. The second value is the limit for my “Ya Xun 880D”.
The temperature spread here is related to the fact that the sensor itself is located directly in the handle of the thermofan, and the temperature of the air at the outlet of the dryer is already different (lower). Plus, you can add the inevitable heat loss caused by the ability to absorb and dissipate heat by the surface being treated, the temperature in the room, the proximity of the hair dryer to the heated area, the power of the air flow, etc. That is why only by experimental way it will be possible to choose the exact value of the operating temperature (thermo profile) for a particular soldering station.
You can read more about computer repair on our official webpage.