We believe that many people are interested in the soldering and maintenance of mobile phone motherboards. The manual soldering of small resistors, capacitors and inductors are difficult because they are tiny, which are several times smaller than the components on the notebook. AiXun soldering equipment for electronics would like to share with you about the soldering method of the mobile phone motherboard, hope that helps you.
Materials: chip resistors, capacitors, circuit boards
Soldering station/soldering iron: for soldering or repairing tiny components
Flux: flux or rosin
Finger pliers: Clamp the tiny components during disassembly, and remove the tiny components after the solder is melted. Used to hold tiny components while soldering
Solder: used when soldering
Anti-static wrist: worn on the hand to prevent static electricity from damaging the mobile phone components
Small brushes, blowing balloons: used to blow away impurities around tiny components
Anhydrous alcohol: used to clean the circuit board
Magnifying glass with light: easy to observe the position of tiny components
1. Preheating
Connect the soldering station to the power supply and preheat the electric soldering iron.
2. Identification
The soldering methods of chip resistors and capacitors are roughly the same, and the soldering points are also very similar, both of which are two flat contact points. But there is a white line in the middle of the contact point of the capacitor to distinguish the soldering point of the resistor. Chip resistors and capacitors are very tiny in size, and some are only two or three hairs big. Resistors are generally black, and the corresponding numbers on the back of the trademark represent their specifications. There will also be a corresponding mark on the circuit board to mark its position.
3. Positioning
First use a soldering iron to melt a little solder to one of the soldering points, then use tweezers to pick up the chip resistors and capacitors and place them on the soldering points, and then use a soldering iron to melt the solder that has just been soldered on, so that one end of the resistors and capacitors is soldered first and fixed Resistor-capacitor.
Note: The resistor and capacitor should be placed in the middle of the two soldering points. If the deviation is relatively large, use a soldering iron to melt the solder again, and fine-tune the position of the resistor and capacitor so that they are right in the middle.
4. Soldering
First melt some solder to the tip of the soldering iron tip, and then tap the other part of the soldering point.
Tip 1: Tin one of the pads first, then use tweezers to hold the patch, align it, and then lightly touch that pad with a soldering iron. After one row is done, tin the other side. Basically, the time to solder a contact is less than 1 second.
Tip 2: For manual soldering, it is easier to solder the 0805 package with the original 0603. Similarly, 0603 pads are better soldered with 0402 components. The hand soldering speed is fast, the solder joint is small, and it is easy to align.
If you are worried about the influence of temperature, use a capacitor with a small package, the soldering temperature can be lowered, and the soldering time can be shortened a lot.
5. Modification
After soldering the resistors and capacitors, observe whether the solder joints are qualified and beautiful. If it is unsightly, it should be soldered again, and a proper amount of rosin or flux should be applied to make the solder surface round.
6. Clean
Take a bean-sized cotton ball, hold it with tweezers, dip it in 95% alcohol, and clean the rosin or solder flux on the surface of the circuit board.
Above are some soldering methods for chip capacitors and resistors on mobile phone motherboards shared by AiXun.
AiXun is a high-tech enterprise dedicated to providing intelligent solutions in the field of precision electronic soldering. The company's business mainly involves intelligent software and hardware development, material analysis, mobile phone repair, precision circuit board soldering, maintance ect. ISO9001 certificate ensure products safer and better quality. If you have any questions, welcome to contact us!
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