Quick Tips to PCB Repair Service

   2019-03-21       34        Computer
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Printed Circuit Boards or PCBs for short are manufactured with utmost care and to specific designs.

Printed Circuit Boards or PCBs for short are manufactured with utmost care and to specific designs.  Though they are generally reliable, there are times in which errors can happen in the construction process, rendering them faulty.  For maintenance issues or otherwise, there may be a need to repair the PCB.  A basic understanding of electrical circuits and how they are implemented in the PCB design is essential for PCB repair service. 

At the very basic level we all know that there are two types of electrical current — alternating current (AC) and direct current (DC). AC current is in the form of a curve, or sine wave, while a DC current is in the form of a straight line.  These days almost all electrical appliances use PCB.  Modern PCBs are manufactured with more advanced design methods and processes and are less prone to error. Today’s PCBs contain copper, fiberglass substrate, silk screen and solder mask. Contemporary PCBs consist of multiple layers necessary to house complex circuitry making PCB repair service a tougher process.

The diagnosis, repair and troubleshooting of modern PCBs have become tougher as numerous high-pitch parts are not identified on the boards.  Boards of the previous decades were easy to repair with the use of automated testing tools, which no longer work on modern PCBs.  Therefore, the trouble-shooting logic varies greatly with the PCB generation.

On old PCBs trouble shooting was performed through inspection of joints (soldering), inspection of ICs testing the functionality, troubleshooting specific components and parts, prone for frequent errors and consultation with software manual.  As a majority of these tests and procedures are ineffective today, modern PCB repair service requires a much more complex analysis.

Before actually latching on to the repair work on a printed circuit board, we must identify the root cause of the problem. Diagnostic work follows thereafter.

Identification of the problem:

The problem is identified with the use of a VI instrument. The alternating voltage is used to test the unidentified pin count.  The location of the problem is then identified with a microscope. Finally, the faulty component is removed from the circuit board, and replaced with a functional one.

In electrical circuits the electrical components are generally arranged (connected) in Mixed, Parallel or Series connections.  The easiest way to find the signature or analyze is to compare the faulty PCB with a functional PCB of the same make/model.  For comparison, the similarities between all defective PCBs should be examined and compared and contrasted with functional PCBs.  The current, inductance, voltage and resistance etc., should be computed and contrasted to determine what’s wrong.

While attempting repair, any deposits of partially worn off solder should be removed.  The examination and dust removal process itself should be done with care as there is a possibility that certain tracks may incur damage.  Each pin is tested for proper output/input. 

The following is the sequence of steps to fix the PCB.

Clean the affected part of the PCB with isopropyl alcohol.  Dry e"

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Accurate Technology brings a wide range of servo drives service and PCB repair services in India/ Pondicherry. In the end, the market sphere benefits with affordable services.

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Accurate Technology

Accurate Technology brings a wide range of servo drives service and PCB repair services in India/ Pondicherry. In the end, the market sphere benefits with affordable services...


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