![]() ![]() I let it cool for 10 minutes and reassembled it. With nothing to lose, I broke out my hot air gun, set it to 750 degrees F and waved it over the chip in question for roughly a minute. I disassembled the laptop down to the bare motherboard. The chip was a ball grid array, making the pins difficult to get to and check. A little research revealed an occasional problem with this model was a poorly soldered GPU chip on the motherboard. Paste flux (water soluable is preferred) 3. Reflow source (reflow oven, hot air system, IR system) 2. He said that for the past few weeks it had been throwing up errors and bluescreening relating to the integrated graphics. This instructable will use the solder preform process to teach you how to reball a plastic BGA in about 10 minutes or less. ![]() Hot Air Saves The DayĪ client recently came in with an HP laptop (HP Pavilion DV2700, PN: KQ654AV) behaving badly. Semiconductors are sensitive to heat and being too hot for too long will damage them. The hot air gun should not be on for more than a minute. If the component is large, be sure to keep the stream of hot air moving to distribute the heat evenly. Turn on your hot air gun and blow on the component until you see the solder paste get shiny. Hold the component down with a pair of tweezers or something else that won’t catch fire. The front and rear return air design effectively prevents the influence of airflow among temperature zones and ensures. The hot air gun trick is more for fixing bad connections or mounting or removing single components on an already populated board.įor mounting a single component, put a little solder paste on each of its PCB pads (assuming a surface mount component) and lay the component on the board. These guns push a lot of air and can blow away smaller components if they aren’t held down, so be careful! For hobbyists building boards with lots of small surface mount components, I’ve heard wonderful things about toasters converted into reflow ovens. HowĬommon solder melts around 500 degrees F, no problem for most of these guns. I use a Wagner HT1000, which has selectable 750F and 1000F modes. They are usually around 1000W and some have temperature control. These guns have all kinds of uses and are commonly used in construction to strip paint. If you have just a few parts you need to reflow, you can use a common heat gun available at most hardware stores for around $30. A good hot air solder rework station costs well upwards of $100. ![]()
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