When Restore Broken Printed Circuit Board Without Schematic Diagram, most of engineers will feel it is very difficult and have no idea where to start, below we would like to introduce several methods which can help you effectively conquer this obstacles and find the most efficient way to do it:
Be “chattered”
To thoroughly understand the principles of some typical circuit board system, familiar with it, the circuit drawings are dead, the thoughts in the head are alive, can be analogized, can be inferred, can be inferred from each other, and can be used for everything.
For example, switching power supplies are always inseparable from the oscillating circuit, switching tube, and switching transformer. When checking, check whether the circuit is vibrating, whether the capacitor is damaged, and whether the transistors and diodes are damaged. No matter what switching power supply is encountered, operate it. It ’s the same, the circuit board can be repaired without schematic diagram.
For example, microcontroller systems with embeded memory, including crystal oscillators, three buses (address lines, data lines, control lines), input and output interface chips, etc., can’t be separated from these areas for circuit board maintenance.
Another example is the analog circuit composed of various operational amplifiers which will fit for the analog circuit design requirement. Even if it changes a lot, it can be reasoned on the basis of “virtual short” and “virtual break”. It can also be clever and detailed. After practicing the good skills of analysis and reasoning, even if you encounter a device that you have never seen before, you only need to figure it out in principle.
