PCB News - Circuit board repair experience sharing

Circuit board repair experience sharing

Circuit board repair experience sharing, the circuit board is the most common object in electrical appliances. It plays an important role in all electrical appliances, because the machine mainly depends on it to work, so damage means that the entire machine is not in working condition!

Regarding a broken machine, I believe that most beginners will dare not disassemble the machine for maintenance because they don’t understand it well. For this, I suggest that everyone boldly disassemble the shell first to observe the circuit, and then do it, provided that you have to be careful! Most of the machine is divided into several circuit boards to work, like the power board is to pass the mains through the corresponding The components convert 220V city electricity into the voltage required by each section to supply the corresponding sections. The main board is equivalent to the control center of the machine, the brain of the machine, responsible for the interactive data transmission between the machine and the human, and the corresponding work of controlling other sub-modules. Let the machine complete each action! But to complete this kind of work, each circuit board needs to be in a normal working state, and if there is damage, as mentioned at the beginning of the article, the machine will strike!

Although the functions of the various plates in the machine are different, they are basically a board with a collection of components, and the maintenance methods are roughly the same. So, let me tell you about some methods and skills of my circuit board repair, and give you a reference for beginners!

Circuit board repair is divided into disconnection test and online test. The disconnection test is to disconnect the power supply and test whether the resistance to ground of the major power inlets on the board is correct. If the resistance of which group is low or is directly short-circuited, then It means that there is a local short circuit on the circuit board, or the component is broken or the chip is damaged. Basically, the short circuit is faulty. It is necessary to eliminate the fault point and continue to find out the specific situation!

There is also online measurement (online measurement and oscilloscope measurement, because after the online test and disconnection resistance measurement with a multimeter, you can basically determine where the fault is, so I won’t introduce it). After the short-circuit test, rule out that there is no short circuit on the circuit board. After powering up, test the voltage of each group is not normal! For example, if some lines are disconnected, there will be faults if the power supply is not passed. It is necessary to make good components worse. Power arrives at the designated location! Circuit board repair is mainly to be familiar with the repaired circuit board. You must know which one is the central control area, which one is the cache area, which one is the clock and reset, and many boards are similar. As long as you pay more attention, pay more attention to carefully analyze the overall circuit, and sort out the corresponding areas on the board, you will be able to repair it yourself!

Everyone’s circuit board repair methods are different. This depends on how you repair it! In addition to the repair skills, you must also be familiar with the corresponding electronic components! For example, what resistors are used for, diodes, The application of the triode, the function of each chip module, etc. must be mastered. If you don’t talk about it, you must have a latent cognition! Only in this way can you swim in the ocean of maintenance! There are deficiencies and I hope everyone can point out and take care of them. Make up! Thank you everyone!

ipcb is a high-precision, high-quality PCB manufacturer, such as: isola 370hr PCB, high-frequency PCB, high-speed PCB, ic substrate, ic test board, impedance PCB, HDI PCB, Rigid-Flex PCB, buried blind PCB, advanced PCB, microwave PCB, telfon PCB and other ipcb are good at PCB manufacturing.