Surgeon grade rework and repair, by the book and guaranteed.®
Newsletter | Contact Us
Phone: 978-374-5000
  
Unique Ground Plane Transplant Repair More Features
In the world of rework and repair there can never be a standard procedure for every emergency. Things can happen quickly, and there can be an urgent need to go above and beyond the recognized standards outlined in IPC and other industry guides.

These kinds of situations demand innovation, new processes. Through the years we've had many occasions to work closely with our customers and partners to create leading-edge solutions.

In this example we developed a procedure to repair large ground plane voids. We worked hand-in-hand with a customer who provided critical reliability data for the completed repair that confirmed the repair process was sound.

Several challenging and unique approaches were attempted before a final process was certified. Although this is a bit extreme, it does represent an example of the type of relationship we have with many of our customers developing leading edge circuit board repair processes.

Outline
This method is used to repair damaged surface ground planes. The damaged areas are repaired with dry film adhesive backed copper foil disks. They are bonded to the circuit board surface using a bonding press.
Special Tools/Materials

Instructions
  1. Clean the area.
    Unique Ground Plane Transplant Repair
    Damaged Surface Plane


  2. Secure the circuit board in a Precision Drill/Milling System with a microscope available for viewing. Use an end mill slightly larger than the void in the surface ground plane and make a counter bore through the surface plane only. Do not mill into the laminate material, you may expose inner layer circuits.
  3. Clean the area with solvent.
  4. The area for the new adhesive backed disk on the board surface must be smooth and flat. If internal fibers of the board are exposed, or there are deep scratches in the surface, they should be repaired. Refer to appropriate procedure.
    Unique Ground Plane Transplant Repair
    Figure 1: Milled area to remove damaged foil .
  5. Select a replacement adhesive backed disk that matches the size of the end mill used to make the counter bore.
    NOTE
    The thickness should be selected to meet the requirements of the circuit board surface plane thickness.
  6. With the adhesive backed disk positioned film side up, carefully scrape off the adhesive film from the outer 0.005" of the disk diameter.
  7. Position the adhesive backed disk, film side down. Place a piece of high temperature tape over adhesive backed disk, position the adhesive backed disk into the counter bore. Press the adhesive backed disk into position. (See Figure 2).
  8. Select a bonding tip with a shape to match the shape of the adhesive backed disk.
    Unique Ground Plane Transplant Repair
    Figure 2: Transplant new foil disk into milled out area.
    Position the circuit board so that it is flat and stable. Place the hot bonding tip onto the tape covering the adhesive backed disk. Apply pressure and heat as recommended in the manual of the Repair System for 5 seconds to tack the adhesive backed disk in place. Carefully peel off the tape.
  9. Gently place the hot bonding tip directly onto the new adhesive backed disk. Apply pressure and heat as recommended in the manual of the Repair System for an additional 30 seconds to fully bond the new adhesive backed disk. The new adhesive backed disk is fully cured. Carefully clean the area and inspect the new adhesive backed disk for alignment.
  10. Using flux and solder, carefully add a small amount of solder to a soldering iron with a "Blade" shaped tip, and flow solder over the repaired area.
  11. Using the "Blade" shaped soldering tip and desolder braid, remove any excess solder. Clean the area.
  12. Using the Electric/Hand Eraser, clean and buff the soldered area to blend the repair to the circuit surface.
    Unique Ground Plane Transplant Repair
    Figure 3: Solder tin the area and blend in.
  13. Using high temperature tape, mask off an area larger than the repaired area.
  14. Using the abrasive pad, "lightly" buff the masked area to further blend the repair to the circuit surface as necessary. (See figure 3)
  15. Clean the area.
  16. Blend the surface using an appropriate buffing material.
Another common defect solved using a not-so-common solution.
Several members of the Circuit Technology Center team contributed to this feature story.
Questions / Comments?
Call 978-374-5000 or submit your questions, comments and requests using the form below.

Your Name


Your E-mail


Your Phone


Your Company


Your Country


Send us a file

Maximum file size 4 megabytes.

Questions/Comments



Customer Comments
"We were certain the circuit board we sent to you were beyond repair, but we sent them anyway. They came back, we tested them, and they all functioned perfectly. Job well done!"
A.Z. Guadalupe, Mexico
Six Fast Fixes for Circuit Boards
Six Fast Fixes for Circuit Boards
Use this versatile kit to fix damaged SMT pads, lands, gold edge contacts, conductors, plated holes and base board. It's the total package.
Learn more ...
6 Common Mistakes of BGA Rework
6 Common Mistakes of BGA Rework
BGA rework is a very challenging procedure. Doing it right depends in large part on the skills and knowledge of the rework technician.
Learn more ...
Circuitry Repair on Multilayer PCBs
Circuitry Repair on Multilayer PCBs
Learn about services to repair severe damage to conductors and plated holes, including damaged holes in multilayer PCBs.
Learn more ...
Perfect Kit for Replating Gold Contacts
Perfect Kit for Replating Gold Contacts
There's simply no reason to scrap circuit boards when they have contacts contaminated with solder. Restore them using the Gold Contact Plating Kit.
Learn more ...
About Us | Base Board Repair | BGA Reballing | BGA Rework | Coating/Marking | Circuit Repair | Component Salvage | Conflict Minerals | Contact Us | Copyright/Disclaimer | Directions | ECO/Modification | Feature Articles | Frequent Questions | Gold Contacts | Intranet | Inspection | Order Tracking | Newsletter | Plated Hole Repair | Prices, Terms, Delivery | Products | Privacy | REACH | RoHS | Services | SMT/BGA Repair | SMT/PTH Rework | Sitemap

Circuit Technology Center, Inc.
22 Parkridge Road
Haverhill, MA 01835 USA
Copyright © Circuit Technology Center, Inc.. All rights reserved.