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Re: sigmatel s4 is not starting
A Sigmatel S4 is a kind of cell phone dude. 1 - Get the manual for it. 2 - Read the manual for it. 3 - Take the battery out of it, wait 10 minutes, put the battery back in and start from scratch setting things the way you want them to be. 4 - If none of that works take the phone to your provider and get them to fix it or trade it for a not broken one.
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There is ceramic heating element that gives problems, and there is some kind of transformer or coil below that. I had no success in repairing the iron so I ended up replacing it. My soldering station saw two iron replacements over the years, I checked to make the station was putting out the 24volts required.
It's probably dirty, and dirt is lousy for transferring the heat from the tip to the solder. With the iron hot, wipe it on a wet rag. This should immediately remove the black crud and make the tip shiny. Keep a wet rag handy to do this often if you are soldering for more than a couple of minutes. If the crud is too bad, you can use a bit of soldering flux on the tip, then the wet rag. If that doesn't work, you can file the tip (easiest when it's cool) until you have copper showing all around the tip.
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I am assuming that you installed a new tip. Note, the tip ends have to be 3/8 of an inch 90 degree bend so that when you insert the tip leads into the barrels, they go into the small holes in the barrels. Also note, the nuts to tighten the tip into the gun have to be installed onto the tip leads before bending the leads. Now when the tip is installed this way, the nuts tighten and hold the tip in the barrel. This tightening of the nuts allow the tip to have a good electrical connection to the barrels and this is what allows the tip to heat. You actually have an electrical current that passes through the barrels and the tip. It is a very low voltage (around 2) but a very high current. Over time the tip will not heat, this is a sign to either tighten the nuts, or look at the tip to see if it has a break in it. If it has an open, then it is time to change the tip.
Turn it on long enough to melt solder, then switch off for a short time. Repeat this process as you solder to avoid oxidizing the tip and solder, yet keeping the solder fluid. If it starts to poorly heat the tips, tighten the tip nuts somewhat to break the oxidation that occurs on the bare copper. Hope this helps!
1- pull the trigger and melt some solder onto the tip then release the trigger. 2- hold all the wires together. 3- touch the tip to the wires and pull the trigger. when the solder on the tip melts again it will flow onto the wires
these are not worth repairing as the main part of a soldering iron is the transformer which is what causes the tip to get so hot, so if yours is giving off smoke and excessive heat probably the transformer is starting to cook itself which means it has to be replaced. I would guess that the transformer will cost you more then a replacement soldering gun on ebay would cost. Hope This Helps Don