PCB Tech - Analyze the SMT patch processing and repair process​

In the production process of SMT patch processing, there will be some processing defects or undesirable phenomena that we do not want to see occasionally. For PCBA products with problems, we cannot let them flow into the next processing link or even leave the factory. Next, PCBA manufacturer-ipcb will introduce the SMT patch processing and repair process for everyone.

SMT patch processing rework

SMT patch processing rework trilogy
1. PCBA desoldering and disassembly
1. Remove the PCBA coating first, and then remove the residue on the working surface.
2. Install a hot-clamping soldering iron tip with a suitable shape and size in the hot-clamping tool.
3. Set the temperature of the soldering iron tip to around 300°C, which can be changed as needed.
4. Apply flux to the two solder joints of the chip component.
5. Use a wet sponge to remove oxides and residues on the tip of the soldering iron.
6. Place the soldering iron tip on top of the SMT component, and clamp the two ends of the component to contact with the solder joints.
7. Lift the component when the solder joints at both ends are completely melted.
8. Place the removed components in a heat-resistant container.

2. PCBA pad cleaning
1. The chisel-shaped soldering iron tip is selected, and the temperature is set at about 300 degree Celsius, which can be changed appropriately according to needs.
2. Brush the soldering flux on the pads of the circuit board.
3. Use a wet sponge to remove oxides and residues on the tip of the soldering iron.
4. Put a soft tin-absorbing braid with good solderability on the pad.
5. Gently press the soldering iron tip on the solder-absorbing braid. When the solder on the pad is melted, move the soldering iron tip and the braid slowly to remove the residual solder on the pad.

3, PCBA assembly welding
1. Choose a soldering iron tip with a suitable shape and size.
2. The temperature of the soldering iron tip is set at about 280 degree Celsius, which can be changed appropriately as required.
3. Brush the soldering flux on the two pads of the circuit board.
4. Use a wet sponge to remove oxides and residues on the tip of the soldering iron.
5. Use an electric soldering iron to apply an appropriate amount of solder on a pad.
6. Use the insert to clamp the SMT chip component, and use an electric soldering iron to connect one end of the component to the soldered pad to fix the component.
7. Use an electric soldering iron and solder wire to solder the other end of the component to the pad.
8. Solder the two ends of the component with the pads respectively.

SMT chip processing

ipcb processing advantages
1. Strength guarantee
▪ SMT workshop: It has imported placement machines and multiple optical inspection equipment, which can produce 4 million points per day. Each process is equipped with QC personnel, who can keep an eye on product quality.
▪ DIP production line: There are two wave soldering machines. Among them, there are more than ten old employees who have worked for more than three years. The workers are highly skilled and can weld all kinds of plug-in materials.

2. Quality assurance, high cost performance
▪ High-end equipment can paste precision shaped parts, BGA, QFN, 0201 materials. It can also be used as a model for mounting and placing bulk materials by hand.
▪ Both samples and large and small batches can be produced. Proofing starts at 800 yuan, and batches start at 0.008 yuan/point, and there is no start-up fee.

3. Rich experience in SMT and soldering of electronic products, stable delivery
▪ Accumulated services to thousands of electronic companies, involving SMT chip processing services for various types of automotive equipment and industrial control motherboards. The products are often exported to Europe and the United States, and the quality can be affirmed by new and old customers.
▪ Delivery on time, normal 3-5 days after the materials are complete, and small batches can also be shipped on the same day.

4. Strong maintenance ability and perfect after-sales service
▪ The maintenance engineer has rich experience and can repair the defective products caused by all kinds of patch welding, and can ensure the connection rate of each circuit board.
▪ 24-hour customer service staff will respond at any time and solve your order problems as quickly as possible.