Printed circuit boards (PCBs) use multiple layers of copper and fiberglass connected with glue or epoxy resin. Although the epoxy resin used in the printed circuit boards is heat-resistant, sometimes it can get damaged due to overheating and high voltage issues.
At this time, you may want to know how to fix a broken circuit board contact. Well, repairing the circuit boards is really a frustrating task, given the fact that it is time-consuming and needs strict attention from your part.
But don’t worry.
We are going to reveal the easiest way to fix the broken circuit board as well as repairing burnt PCB pads for your convenience.
How To Fix A Broken Circuit Board Contact
If the wiring of a printed circuit board is damaged, it will fail to perform the similar way as it was used to do earlier. It will result in unsatisfactory performance from the device. So, it is crucial that you truly know how to fix a broken wire on a circuit board.
The process includes:
Step 1: Applying epoxy
The key to repairing any damaged or broken parts of a printed circuit board is to apply the epoxy resin properly. For this, read the user manual and mix the resin on the board following the manufacturer’s instruction.
After that, spread it on one side of the printed board. Now press and hold on two separate pieces of PCBs near until the epoxy resin connects them accurately. It will take 20-30 seconds for the epoxy to set in between the two parts of PCB.
However, we recommend you to leave away the boards for at least thirty minutes. After that, you may proceed to the next steps. It will allow the epoxy resin to set correctly on the damaged boards.
Step 2: Work with the traces
Now, carefully look for the broken copper traces in the printed circuit board. Then use a proper razor knife to cut through the copper traces smoothly.
One by one, cut and remove all the damaged and lost traces. Now use a soft emery cloth to smoothly sand the sections from where you have removed the loose copper traces. You will have to continue grinding on both sides until the bright copper is clearly visible from outside.
It would help if you were ardently careful not to touch the undamaged traces on the printed circuit boards so that they also don’t get hurt in the process.
Step 3: Preparing for the soldering
Next, you will have to prepare the printed circuit board for soldering to reestablish the wired connection between the boards. For this, at first, find a 110V receptacle (power source) and plug in the soldering pencil in it.
Then wait until the soldering pencil becomes hot. When the soldering tip gets hot, wipe it using a wet soldering sponge. Make sure to plug off the soldering pencil before wiping it on the sponge. Also, ensure that the tip is free from every dirt and oxidation for fine soldering later.
Step 4: Applying tinning coat
Now, it is time to apply a thin but useful ‘tinning’ resin coating on the tip of the soldering pencil. If the tinning is appropriately used, the tip will look bright silver. However, sometimes the tip may look like a dull grey color.
If such is the case, you may require to repeat ‘step 3 and 4’ to keep the tip of the soldering pencil neat and clean and ready for further soldering. If you fail to keep the tip clean, the heat won’t dissipate smoothly and result in bad soldering.
Step 5: Applying rosin core
Now, find the bare copper traces right on the printed circuit board and apply rosin core solder masking on it. You will have to be careful so that the heat isn’t too much on the copper board. If the applied heat is too much, it will damage the printed circuit board.
Also, if you apply heat more than necessary, it will detach the copper trace from the board.
Step 6: Applying copper wire
Now select a quality 18 gauge copper wire. Use a cutting tool to cut the copper wire adequately so that it may span the copper traces. Now use rosin-core solder to tin such short wirings.
Step 7: Layering the copper wiring
Use tweezers to pick the tinned wires one after one carefully. Then lay the picked wiring right on the traces from where you have removed the loose traces lately.
After you have layered the copper wiring on the traced gaps, you will require soldering them properly. For this, use the soldering pencil tip and fuse the 18-gauge copper wiring accurately in the holes. You will have to repeat the wiring procedure to fill up each loose trace and link the wiring appropriately.
Step 8: Checking for correctness
Once you are done with the repairing job, assemble the device, and check if everything is working correctly or not. Ideally, it should.
However, if the device still malfunctions, you may need to find out the cause once again and repeat the repairing process once again.
How To Repair Burnt Circuit Board
If somehow the printed circuit board is burnt in any parts, you can quickly fix it. Start by cleaning the brunt area with a saturated swab or IPA liquid. Then, use an appropriate razor knife to remove the loose materials from the board.
After that, you will have to apply epoxy resin on the damaged parts and reestablish the wiring connections. The procedure remains the same as described in the above sections. So, it should be easy to follow for you.
The printed circuit board has become a breakthrough technology in our daily life. These boards are used in a myriad of devices. So, when a PCB board is damaged, it may, at times, cause us severe problems. Thus, the above guideline on how to fix a broken circuit board contact should come beneficial for you.
Luckily, the process isn’t a challenging one. However, it requires patience and attention. So, be aware of it.