Can a burnt circuit board be repaired?

In PCBA Manufacturing, if there is only visible component damage, just replace Electronic Components. If the circuit board is broken and the PCB cannot be seen to be damaged, check the working conditions of each part according to the circuit diagram, use a universal meter to check whether the current of the circuit and the resistance and voltage of some Electronic Components are normal, so as to find the cause and repair the fault. . PCBA has a large short circuit. Use the burn-in method to find the hot Electronic Components to find the short circuit point. Sometimes Electronic Components don't know whether they are good or bad, so they can only replace one by one and remove them one by one until the voltage or current of the PCBA returns to normal, so that the damaged components can be found. If you are lucky, you can find the fault once, and if you are not lucky, it will take a long time.
In custom pcb fabrication, if the circuit board is directly broken, or the circuit board is corroded, there will be points, breakage, etc. This is a test of the technician's skills, at this time it is necessary to wire or fly directly. Scratch the circuit board for wiring, or find a pin with the same voltage and fly a wire directly. Some circuit boards are directly broken, especially when there are many layers, which need to be scraped off layer by layer and wiring layer by layer.
Repairing the circuit board should consider the value of repairing Low Cost Prototype PCB.
In some cases, when the repair cost is high, it is not recommended to repair, but directly replace the circuit board. In addition, we must also consider the technical problems of the maintenance personnel, especially the circuit board cannot find any faults, and it is more expensive to replace the circuit board. It is best to change to another shop for repair instead of replacing the circuit board.