Many users may have a doubt when they first encounter BGA rework stations: what are the differences between a conventional BGA rework station and a high-precision optical BGA rework station? Let’s start with two concepts from Baidu. Optical alignment—utilizing an optical module with a prism imaging method, LED lighting, adjusting the light field distribution to display the chip image on the monitor, achieving optical alignment rework. Non-optical alignment—aligning the BGA manually based on the PCB silk screen lines and points to achieve alignment rework.
One of the advantages of a high-precision BGA rework station for soldering BGA chips is that the temperature profile can be precisely set. The BGA rework station undergoes a preheating period at 190°C, then automatically ramps up to 250°C, and finally reaches 300°C for proper soldering of the solder paste. Then, it gradually decreases in temperature and cools down. The temperature profile settings also vary depending on factors such as whether the chip contains lead, chip size, and different brands of solder paste, with different temperatures and durations for each stage.
Compared to a conventional SMD hot air rework station, the advantage of a high-precision BGA rework station is the ability to rework highly precise BGA chips. Chips such as Chip01002/Chip01005 and BGA chips with adjacent spacings of 4mm can be reworked. The main reason why a conventional BGA rework station cannot achieve high-precision BGA rework is that it cannot reach the temperature requirements for reworking densely spaced BGA chips. This is the biggest advantage of a high-precision BGA rework station over a conventional one.
A high-precision BGA rework station can rework various types of BGA chips, such as large-scale server motherboards, tablets, smartphones, etc. The fully automatic optical automatic welding machine can automatically recognize the chip removal and placement process, making the operation simpler compared to manual or semi-automatic optical BGA rework stations, requiring only one-button operation to complete.
In summary, the advantages of a high-precision optical BGA rework station include high precision, simple operation, and high soldering success rate.
