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9.4.4 BGA Component Reballing, Touch-less Ball Removal Reflow, Reflow Oven Attachment Method

Outline
This procedure covers reballing of BGA components.

Proprietary Information Proprietary
This guide may contain proprietary or copyright-protected information for access by authorized persons only.

Minimum Skill Level - Expert
Recommended for technicians with advanced soldering and component rework skills and extensive experience in most repair/rework procedures.

Conformance Level - High
This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.

Acceptability References
IPC-A-610 Acceptability of Electronic Assemblies  Proprietary
Procedure References
1.0 Foreword
2.1 Handling Electronic Assemblies
2.2 Cleaning
2.5 Baking And Preheating
IPC J-STD-033 Joint Industry Standard for Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Device  Proprietary
Tools and Materials
Cleaner
Cleaner
General purpose cleaner for removing contamination.
CircuitMedic Part
Cleaning Brushes
Disposable brushes for use with solvents for cleaning and application of coatings.
Cleaninjg System
Cleaning System
Batch or inline cleaning system for removing fluxes and contamination.
Gloves
Gloves
Disposable, puncture-resistant gloves designed for handling mild chemicals.
Microscope
Microscope
Precision microscope with stand and lighting for work and inspection.
Oven
Oven
General purpose oven for drying, baking and curing epoxies.
Safety Glasses
Safety Glasses
Protect your eyes and your vision with proper safety glasses.
Solder Flux
Solder Flux   Proprietary
Used to prepare solder surfaces and to prevent formation of oxides during soldering.
Solder Paste
Solder Paste    Proprietary
Solder paste for component soldering and rework.
Solder Paste
Solder Spheres    Proprietary
Solder balls or spheres for BGA component reballing and rework.
Wipes
Wipes
Nonabrasive, low-linting wipes for cleanup.
Procedure - Touchless Ball Removal
  1. Place a matrix tray of the BGA components into the touch-less BGA deball system. See Figure.
  2. Run the devices through the deball cycle to remove the existing solder balls. See video above.
  3. Clean the BGA components with approved cleaning solution. Some cleaning solutions may be specified by customer or contract. Typical cleaning process uses a Cleaning Brush and Cleaner. Gently brush the surface until all evidence of flux and debris have been removed. Dry with a clean Wipe or blow off using an air gun.
Procedure - Reflow Oven Attachment
  1. Apply tacky flux to the flat BGA component pads using a Brush. Flux should be evenly applied across the entire BGA pad surface. Use minimal flux needed to fully cover the surface. Remove any excess flux. See Figure 2.
  2. Place the BGA component(s) into a fixture and cover with a matching stencil. Check to ensure the alignment is correct. See Figure 3.
  3. Place a quantity of the appropriate size Solder Spheres into the fixture and use a clean Cleaning Brush to distribute the Solder Spheres so they fill all the open apertures in the BGA Component Stencil. Check to be sure all the apertures are filled with only one solder sphere. Tilt the fixture and pour the excess Solder Spheres into a collection container for reuse.

    Note
    Avoid overloading the Solder Stencil with excess Solder Spheres as they may wedge under the stencil. This will make lifting the Stencil to remove any excess Solder Spheres difficult.
  4. Set up the Reflow oven with the proper profile and run the oven for 5 minutes to ensure the reflow zone temperatures are stable.

    Note
    If a profile has not been defined a profile will need to be created.
  5. Place the BGA fixture and BGA components into the reflow oven. As the fixture moves through the oven the fixture and components will go through the required preheat, reflow and cooling cycles.
  6. When the fixture and components emerge from the reflow oven use gloves and remove the fixture and place on a flat surface. Allow the fixture and components to cool for one minutes to ensure package thermal stability prior to removing the BGA component from the fixture.
  7. Visually inspect the BGA components balls for proper alignment and appearance.
  8. Clean the BGA components in approved cleaning solution.
  9. Inspect the body of the BGA component for abnormalities.
  10. Inspect the BGA component for cleanliness.
Procedure for reference only.
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