Reliable Rework Returns
From the first to the 2,000th board – Finetech engineers reproducible processes for high-volume BGA rework.
Even standard BGA rework can be challenging, especially when the goal is to have reproducible results. It is one thing to attain 100% quality – and it is another to sustain it over and over again with every repaired component.
BMK Group, a large German EMS provider and a longtime partner of Finetech, offer services in development and production, as well as repair. They are experts in chip-level rework and perform over 8,000 repairs per month for customers in various industries. For them, every chip matters.
BMK Group received a request from a product manufacturer to repair 1,500 assemblies containing defective RAM components. The product was due to enter the market in 4 weeks. This put considerable pressure on BMK in terms of lead time, further increased by a possible contractual penalty for the customer, in their turn, if the company would not be able to fulfill their delivery obligations.
- multi-level CPUs with 8 layers each
- double-sided SMD population
- every module containing 8 or 16 RAM components, depending on the product line
Each RAM component had to be replaced individually, which meant 8x or 16x soldering and desoldering sequences for each module. For high-volume orders, this would result in a significant loss of time.
The customer made their expectations very clear - nothing less than complete rework excellence. With these specifications, every component counts.
Such a demanding application needed a quick and reliable solution – and BMK and Finetech developed one together. Due to its process modularity, Finetech’s FINEPLACER® rework station allowed all process steps to be carried out within one system. Thus, the entire rework process was developed in a way that ensured stable reproducibility.
A customized soldering nozzle was designed specifically for the BMK application. It had four slots instead of one, where four RAM components could be desoldered at once. This way, four process steps could be cut down to one, providing valuable lead time benefits not only for BMK, but also for their end-customer.
Due to very high output requirements, destructive tests were conducted to verify compliance with all customer specifications. The results showed the yield rate achieved on Finetech’s equipment was better than 99%, dispelling any doubts BMK and its customer might have had.
Later on, BMK received further requests from other manufacturers with similar requirements and could provide outstanding rework quality.
"We have been partners with Finetech for over 15 years now and they have always been open to our needs. The support they provide is immeasurable – their engineering team is very accessible and everyone is well connected and deeply involved with each project. The quality we get is always at the highest level – from the first to the 2,000th board.”Nafi Pajaziti
CEO, BMK Electronic Services
Rework of BGA/CSP and CPU/GPU SMD
The rework of BGA components with large ball arrays, processor units (CPU) as well as graphics chips (GPU) and CSP with a fine pitch array demand special device configurations that combine precise thermal management with high placement accuracy and high-resolution optics.