Rework of BGA / CSP

BGA Rework has become synonymous for SMT Rework in general. Many users’ needs focus around BGA/CSP/Flip Chip, so information found here provides a general background, applicable not only to array packages, but also to the broader SMT Rework market. Large sphere arrays (BGA), and small fine pitch arrays (CSP) demand configurations that combine precise thermal management and high resolution optics, to ensure a void-free rework process and accurate alignment.

  • De-soldered BGA component
  • BGA components on a large server board

What are the Challenges?

  • One system for the complete rework cycle - from component removal to re-soldering?
  • Large arrays (20-65 mm) need large optical field of view, whereas smaller fine pitch CSP's (0,8-20 mm) need high magnification (both require good resolution)
  • Solder removal of irregular shaped residual
  • Need to remove the BGA, but leave the neighboring devices undisturbed?!
  • Want instant profiling?
  • Multilayer board sizes from USB stick (12x40 mm) to server board (500x465 mm)?

The Finetech Solution

Remove, Clean, Paste, Reball, Replace

  • Desoldering Component
  • Soldering new Component
  • Residual Solder Removal
  • Applying new Solder Paste

Finetech provides a single platform that can perform the complete rework cycle:

  • Melt solder and remove the defective component with a specialized nozzle design
  • Residual solder removal using a contactless process - done in a single sweep, it produces safe, reproducible cleaning
  • Printing of solder paste on PCB, direct component printing or dispensing
  • Reball either a single defective ball or an entire array
  • Placement and reflow of new component ensuring accurate alignment

Process Camera for In-situ Process Observation

  • View of process cam

It can be used for obervation of the reflow process or for taking pictures/videos for documentation purposes.

Split Field Optics and Zoom Magnification

  • Split Field Optic

The Split Field Optics Video Imaging System enables diametrically opposite corners of a large component, and its corresponding pad area on the substrate, to be viewed under high magnification.

Integrated Process Management (IPM)

  • Integrated Process Management (IPM)
  • Principle of process gas integration
  • Operating software for rework

The Integrated Process Management (IPM) is the center piece of a FINEPLACER® system1 - the place where it all comes together. IPM is more than just thermal management. It synchronizes the control of all process modules and their related parameters:

  • Controlled and precisely balanced interaction of top and bottom (pre-)heating and cooling
  • Control of temperature, time, force, power, energy, flow
  • Controlled process gas integration for reduced solder contamination, minimized surface tension effects and smooth spherical solder residues

 IPM is very complex, yet easy to access. Via the GUI of the operating software, the user has perfect control of all required adjustments. Just drag 'n drop to define temperature ramps or activate process modules. All settings are represented in only one profile, making for a very intuitive work flow.
 
The operating software provides an ever-growing library of profiles for all kinds of processes. It also offers comprehensive data logging functions essential for statistical process control.

In combination with the system-to-system process transfer capability this is as easy as process development can get.

1 FINEPLACER® core offers co-ordinated top and bottom heating but does not support IPM

Recommended Rework Systems

  • FINEPLACER® coreplus
    Cost-effective rework of medium-sized boards
  • FINEPLACER® jumbo
    Large area rework station
  • FINEPLACER® pico rs
    High density rework station
  • FINEPLACER® micro hvr
    High volume rework station

Amongst other factors, the recommended system mainly depends on size and pitch of your component and the required process flexiblity.

Browse our product range or get in contact with your sales contact to figure out the best equipment solution for your needs.