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| [title] Replace the old with the new (soldering) | |
| [* black] Disconnect all power connections before you start and get anti-static. No warranty! | |
| [* black] Have the replacement transistor ready for deployment | |
| - | [* black] Heat up the soldering iron (350-400 |
| + | [* black] Heat up the soldering iron (350-400°C or 700°F should be right depending on your lead, iron welder, etc.); avoid temperatures that are far above melting due to the sensitivity of SMD devices, see also the [http://www.onsemi.com/pub_link/Collateral/SOLDERRM-D.PDF|On Semi guide] or [https://www.sparkfun.com/marcomm/SFE03-0010-KitCard-SolderingSMD-ReaderSpreads.pdf|Sparkfun's SMD Soldering Guide] |
| [* black] Remove the broken transistor by carefully heating the SMD pads that connect T1 (or T2) to the mainboard PCB. Because there are three pads, try circular rotation while using tweezer to pull of the broken device | |
| [* black] Use the solder suction pump to remove any old solder around the transistor pads | |
| [* black] Note: This guide is assuming that the NPN transistor has the following pinning (SOT-23): TOP LEFT: Emitter TOP RIGHT: Base BUTTON: COLLECTOR, see the data sheet and mainboard picture. Nothing too much can go wrong here, as the pads are given in direction. | |
| [* black] Finally, solder the new transistor onto the pads. If you face difficulty with handling the device, tweezers, etc. try [http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=electronics+magnifying+glasses|electronics magnifying glasses] -- Ultimately, check the output voltage according to the software setting (PWM 255 steps) or just connect the fan hopefully it now works again! |