Revamp Your BGA Chips: A Comprehensive Reballing Guide
Posted by Staff - Soldertraining on May 5th 2023
Engineers rely on Ball Grid Array (BGA) boards to establish a reliable connection between the printed circuit board (PCB) and the chip. In order to extend the lifespan of a BGA chip with a rusty hinge, some businesses may need to replace older solder ball joints. Removing the oxidized solder balls and replacing them with new ones is the typical procedure.
VGCs' low dependability (particularly solder joint failure) and high maintenance frequency make them unsuitable in industry. However well-made, reballing will become necessary for even the most cutting-edge BGA circuit chips.
Rebalancing a BGA Circuit: Possible Reasons
The overuse of BGA is a contributing factor to reballing. Depending on how often the graphics processor is used, the BGA package may need to be reballed after only a few days of continual use. Over time, the solder on the PCB could deteriorate, causing chips to move around. This may lead to more severe issues in the future.
Due to their heat sensitivity, BGA chips sometimes fail and require reballing. Overheating chips can cause solders ball to melt and spread across the circuit board, thereby increasing circuit board rework cost. In the event of a malfunction, BGA chips may need to be returned to the distributor and replaced with new chips.
Common Reballing Tools for BGAs
● Soldering Iron as a Heating Device
Soldering is the technique of filling the spaces between the PCB and the transistors with molten metal. Soldering irons, which are insulated from the handle all the way to the tip, are used to join metal components.
● Soldering Compound
It is common practice to use solder paste when soldering surface-mounted components to PCBs. Therefore, it greatly improves the simplicity of soldering and attaching electrical components.
● BGA Chip Templates
Chip stencils are perforated metal sheets used with solder balls to create intricate patterns on chips. The Soldering ball's high metal content makes it ideal for rapid heating with a hot air gun or BGA tools, which streamlines and accelerates the soldering process.
BGA Reballing Procedure
While BGA reballing bga techniques may differ, there are some constants in the industry:
● Deball the Device
Using a syringe and a gloved fingertip, fill the device's balls with a water-soluble paste flux. The removal of solder balls requires a certain blade tip and temperature for the solder ball alloy.
● Remove the Deballed Area's Dirt
To clean the deballed part's base of flux, use an anti-static wipe dipped in isopropyl alcohol.
● Apply Flux Paste
Make sure there aren't any scratches or other damage on the mask or padding. Applying a paste flux that dissolves in water to the part's bottom is a good idea. Use a paintbrush to apply it evenly to the bottom of the mounting surface.
● Prepare the Preform with the Ball Facing Up
Place the preform on a flat heat-resistant surface, like a ceramic plate, with the ball end facing up. Verify if the equipment can handle the patterns on the preform. When assembling electronic components, be sure to use solder balls made from the appropriate solder alloy.
Utilizing this guide's expertise and techniques, you may confidently tackle even the most complicated BGA reballing jobs. You may amaze professionals and win over finicky clients with experience, effort and expertise.