When does it make sense to rework a board instead of replacing it?
A failed or malfunctioning PCB doesn’t always mean starting over. In most cases, what people call “circuit board repair” is really rework: targeted, component- or trace-level fixes performed on an existing board rather than a full rebuild.
PCB rework is the process of repairing, modifying, or replacing a component or connection on a circuit board that’s already been assembled, rather than fabricating a new board from scratch. It covers everything from correcting a single failed solder joint to implementing a late-stage design change on an existing prototype.
Rework can save significant time and cost over scrapping a board and starting a new production run, and for prototype and low-volume work in particular, it’s often the faster path back to a working unit. Here’s what rework actually involves, and when it’s the right call.
BGA Rework and Reballing
Ball grid array (BGA) components are the most common source of rework requests, and for good reason: their solder joints sit hidden underneath the package, out of sight and difficult to inspect or repair without specialized equipment. BGA rework covers the full cycle: removing the failed component, preparing the site, reballing (whether with lead-free, eutectic, or high-temperature CBGA solder, depending on the original design), reflowing the component back into place, and confirming the fix with X-ray and electrical testing. Getting each of these steps right, especially the reflow temperature profile, is what separates a rework that restores a board to full reliability from one that introduces a new failure point.
Why BGAs Fail
Rework requests tend to trace back to a handful of causes. Solder joint failures from thermal cycling or mechanical stress are the most common. Pad damage, usually from improper desoldering technique or excessive force during component removal, is the next most frequent, and it’s serious because it can compromise the board’s ability to accept a replacement component at all. Misalignment during the original assembly is a third common cause, particularly on high-density boards where a fraction of a millimeter of drift is enough to create an intermittent or fully open connection.
Pad and Trace Repair
Not every rework job involves a BGA. Damaged pads and traces, whether from a failed component removal, physical damage to the board, or a design revision, can often be repaired directly rather than requiring a new board to be fabricated. This is typically the more economical option when the damage is localized rather than affecting the board broadly.
Jumper Wire Additions for Engineering Change Orders
When a design needs a late-stage correction, whether it’s rerouting a trace that turned out to be wrong or adding a connection that was missed in the original layout, adding a jumper wire is often faster than waiting for a new board revision. This is especially valuable during prototype iteration, when an engineering change needs to be validated on real hardware before it’s worth committing to a new fabrication run. On boards with dense component placement, standard jumper wire can be difficult to route without interfering with neighboring parts; in those cases, a low-profile flat copper ribbon can be routed underneath a component, including under a BGA package itself, to make a connection that a round wire couldn’t fit. Done well, a jumper wire ECO lets an engineer confirm a fix works before that fix gets locked into the next board spin, catching a second round of errors before they compound.
Component Salvage for Obsolete Parts
When a component goes obsolete, gets allocated out by the manufacturer, or simply isn’t available on a timeline that works for the project, rework techniques can sometimes recover a usable part from a donor board rather than waiting on an uncertain supply chain. This typically means carefully desoldering the component from a board where it’s no longer needed, whether an old revision, a customer-supplied spare, or a board being decommissioned, then inspecting and, where applicable, re-testing it before it’s placed back into service on a new assembly. Salvage isn’t the right call for every part; components sensitive to thermal stress from repeated reflow cycles, or parts where authenticity and traceability matter (as in aerospace or medical applications), need a more cautious case-by-case evaluation. But for a hard-to-source part holding up an otherwise-ready build, salvage can be the difference between shipping on schedule and waiting out a months-long lead time.
Getting a Rework Quote Started
To quote a rework job, we’ll need clear instructions on the exact task, top and bottom images of the board showing where the work is needed, and a parts list for anything being replaced. See our full documentation guide for the complete rework documentation checklist.
IPC-Compliant Rework You Can Rely On
BESTProto’s technicians are IPC-trained and certified, and every rework job is performed to IPC-7711/7721 workmanship standards, the industry benchmark for rework and repair specifically. If you’re weighing whether a board is worth reworking or replacing, contact us, and we’ll help you make that call.
Frequently Asked Questions
Is BGA rework as reliable as a new PCB assembly?
When performed correctly, with the right reflow profile and post-rework inspection, a reworked BGA joint can be just as reliable as the original. The risk isn’t in rework itself, it’s in rework done without proper equipment or process control.
How long does PCB rework typically take?
It depends on the scope. A single BGA reballing job can often be completed faster than a new fabrication run, which is part of why rework is a common choice for prototype iteration rather than just a solution for emergency repairs.
Can you rework a board if I don't have the original design files?
In many cases, yes. Straightforward tasks like BGA reballing or pad repair don’t always require the original CAD files, though anything involving a design change, like a jumper wire ECO, goes faster with them.