BGA Reballing and Repair
Services

Recover boards, validate fixes, and reduce replacement cost. Our controlled BGA reballing process with X-ray inspection supports failure analysis, revision migrations, and cost-effective assembly recovery.

X-Ray

INSPECTION

IPC

7711/7721

7-Step

Process

Full

Documentation

BGA Reballing and Repair Services

High-value assemblies with BGA, CSP, or LGA devices don’t need to be scrapped when joint integrity fails or a revision migration requires component reuse. Circuits Central provides controlled BGA reballing and rework services with X-ray inspection at every stage, IPC-7711/7721-referenced process discipline, and full documentation from incoming assessment through release.

This page is aimed at electrical engineers, hardware designers, and NPI teams who already understand BGA rework fundamentals. The focus here is on process control, failure modes, go/no-go criteria, and what information you need to provide for an efficient, reliable outcome.

Scope of Services

Our rework capability covers the full range of BGA-related interventions:

Device Removal & Reattachment

Profiled hot-air removal with board-specific ramp rates. Reattachment using validated reflow profiles for the package and PCB thermal mass. All cycles logged.

Reballing

Solder sphere application via stencil or tooling matched to ball pitch. SAC305 and Sn63Pb37 alloys supported. Circuits Central has developed an internally refined technique for cost-effective, repeatable sphere placement.

X-Ray Inspection

Pre- and post-rework X-ray at defined inspection gates. Results documented against your acceptance criteria — bridging, voiding, ball collapse, misalignment, and missing balls.

Pad & Site Repair

Pad lifts, trace repairs, and landing site restoration assessed and executed per IPC-7711/7721 guidelines when substrate condition permits. No rework proceeds on a site that cannot support a reliable reattachment.

Failure Analysis Support

Device swap for diagnostic purposes, pre-rework cross-section coordination, and failure characterization inputs for your FA report. Usable for DMIR and field return investigation workflows.

Documented Rework Record

Full traveller per unit: incoming condition, inspection results at each gate, profile data, sphere alloy used, pass/fail disposition, and any recommendations for preventing recurrence.

Go / No-Go Criteria Before Any Thermal Cycle

The incoming evaluation determines whether reballing is appropriate before any heat is applied. Factors that affect the go/no-go decision:

Factor	Acceptable	Elevated Risk / Recommend Evaluate Further
Pad integrity	All pads present, no lifted traces, no delamination at pad edges	Lifted pads, trace damage, exposed copper under mask — pad repair feasibility assessed first
Underfill	No underfill present	Underfilled BGAs require underfill removal prior to rework — risk of pad damage is significantly higher
Prior rework cycles	Zero or one documented cycle	Multiple thermal cycles increase laminate fatigue risk; each additional cycle degrades reliability margin
Board warpage	Within IPC-7711 flatness tolerances for the package footprint	Warpage beyond tolerance increases voiding probability and risks non-uniform ball collapse during reflow
Contamination	No visible flux residue, corrosion, or moisture exposure	Contaminated sites require cleaning and assessment before proceeding; moisture in laminate requires baking
Package type	Standard BGA, PBGA, CBGA, micro-BGA	Embedded die packages, stacked PoP, or devices with known fragile substrates — feasibility confirmed on a case-by-case basis

Reflow, Reball, or Replace — Decision Framework

Intervention	Indicated When	Contraindicated When
Reflow only	Failure mode is head-in-pillow, insufficient wetting, or cold joint confirmed by X-ray. Device confirmed functional. Zero prior rework cycles.	Device suspected faulty. Ball collapse already occurred. Multiple prior thermal cycles. Any pad damage present.
Remove & reball	Joint-related failure mechanism confirmed. Device reusable. Pad integrity confirmed. Revision migration where new PCB revision requires same device.	Underfill present without removal plan. Board warpage exceeds tolerance. Laminate damage visible under X-ray. Unknown thermal history.
Replace device	Device functionally suspect. Rework risk assessed as high. Part readily available. Multiple prior rework cycles already on the site.	Part unavailable or long lead time — reball may then be the only viable path, with appropriate risk acknowledgement.

Process Flow

Initial Assessment

Review of failure symptoms, board assembly revision, prior rework history, and physical inspection for warpage, contamination, underfill presence, and pad condition. Go/no-go determination before committing to scope. Boards with unacceptable risk are returned with written assessment — no rework attempted.

Pre-Rework X-Ray Baseline

X-ray images captured and documented before any thermal cycle. Establishes baseline for bridging, voiding percentage, ball uniformity, and alignment. Results compared post-rework to confirm improvement — not just assumed.

Device Removal

Profiled hot-air removal with board-specific preheat and ramp rates to minimize thermal gradient across the assembly. Adjacent component protection applied where required. Peak temperature, soak time, and cool-down rate logged per unit.

Site Preparation

Residual solder removed via wick and hot-air. Pad surfaces cleaned, inspected under magnification, and conditioned. If pads are damaged, repair feasibility is assessed per IPC-7711/7721 before proceeding. Baking applied if moisture ingress is suspected.

Reballing

Sphere placement via laser-cut stencil or dedicated tooling matched to ball pitch and package outline. Reflow of spheres under controlled profile with flux appropriate to alloy. Sphere uniformity and completeness verified under microscope before proceeding to reattachment.

Reattachment & Post-Rework X-Ray

Device placed with optical alignment verification, then reflowed per a validated profile for the package/board combination. Post-rework X-ray compared against pre-rework baseline and acceptance criteria. Pass/fail disposition documented with image records.

Release Documentation

Full unit traveller released with incoming condition notes, X-ray images (pre and post), profile logs, sphere alloy used, inspection disposition, and any recommendations. Format can be aligned to your DMIR, field return, or production rework record requirements.

What to Include When Submitting a Board

The following information reduces turnaround time and improves assessment accuracy:

Assembly revision and BOM reference for the specific build being reworked
Failure symptoms and reproduction conditions — intermittent, thermal, or systematic; test stage where failure was caught
Rework history— whether any prior thermal cycles have been applied to this site
Reference designator and part number of the target BGA device
Disposition intent — failure analysis only, return-to-service, or revision migration
Acceptance criteria — your voiding limits, bridging tolerance, and any IPC class requirement (Class 2 or Class 3)
Assembly drawing and any prior X-ray images or functional test logs if available
Underfill presence — if the device is underfilled, flag this explicitly so underfill removal can be scoped before any thermal work begins

Frequently Asked Questions

What alloys do you support for reballing – SAC305 only, or also SnPb?

We support both SAC305 (Pb-free, RoHS-compliant) and Sn63Pb37 (leaded). If the device was originally shipped with SAC305 balls and is being returned to a leaded assembly, we’ll confirm the appropriate alloy with you before reballing — mixing alloy systems in a reworked joint has reliability implications at the interface that should be a deliberate decision, not a default. We also support mixed-alloy BGAs where the package substrate uses a different alloy from the board-side pads.

Can you rework an underfilled BGA?

Underfilled BGAs can be reworked, but underfill removal must be scoped and completed before any thermal removal cycle. The removal method — chemical, mechanical, or a combination — depends on the underfill formulation and whether pad preservation is the priority. The risk of pad damage during underfill removal is significant, especially for fine-pitch arrays. If you have a board with an underfilled BGA that needs rework, flag it explicitly when submitting so we can assess feasibility and discuss the approach before committing to a scope.

What voiding percentage is acceptable, and how do you report it?

Acceptable voiding depends on the IPC class requirement and the specific application. IPC-7095 provides guidance on BGA voiding acceptance — Class 2 assemblies typically allow up to 25% voiding per ball with no voids in the central 50% of a ball, while Class 3 applies tighter limits. We document voiding percentage from post-rework X-ray images and report it against whatever acceptance criteria you specify. If you don’t have a specific criterion, we’ll reference IPC-7095 Class 2 as a default and flag anything that warrants discussion.

Can Circuits Central handle BGA rework, reballing, and complex component repair?

Yes. BGA reballing and repair services at Circuits Central can include removal and replacement of BGA devices, correction of solder defects identified through X-ray or functional test, and controlled rework processes designed to reduce scrap on higher-value assemblies. Rework outcomes depend on board condition, thermal constraints of the assembly, and availability of replacement components, so an upfront assessment is recommended to set realistic expectations before committing to a rework scope.

What documentation can I receive with a reworked unit?

Every reworked unit is released with a traveller that includes the incoming condition assessment, pre- and post-rework X-ray images, profile log data (peak temperature, soak time), sphere alloy used, inspection disposition, and any recommendations for preventing recurrence. The format can be aligned to your DMIR, field return investigation, or production rework record requirements — let us know your format early so the documentation is ready at release rather than assembled retroactively.

How many rework cycles can a BGA site reliably support?

This varies by board design, laminate material, copper weight, and the thermal history of the specific assembly. IPC-7711/7721 does not define a universal cycle limit, but industry practice is to treat each rework cycle as consuming reliability margin — with the first cycle typically having the smallest impact and subsequent cycles compounding risk from laminate fatigue, pad adhesion degradation, and via barrel stress. We evaluate thermal history as part of incoming assessment and will advise when the risk of proceeding outweighs the value of the rework, particularly if more than one prior cycle has already been applied to the site.

Can you support BGA rework on Class 3 assemblies?

Yes, with the understanding that Class 3 requirements impose tighter process controls, tighter acceptance criteria, and more rigorous documentation than Class 2. If your assembly is Class 3, specify this upfront so the process plan, inspection criteria, and documentation can be structured accordingly from the start — retrofitting Class 3 traceability to a completed rework record is neither clean nor practical.

BGA Reballing and Repair Services – Demo