Each circuit board maintenance engineer has its own different judgment methods and maintenance ideas. However, the maintenance steps can be summarized into the following six steps. Trouble understanding board maintenance, first understand the fault situation, and fix the fault judgment in a smaller range, which is conducive to repair work, so understanding the fault condition of the circuit board is very important for starting repairs.
1. Board observation: Board observation is preliminary research, the purpose is to understand what input and output interfaces the board has, what functions the board has realized, and the distribution of various control parts of the board.
2. Line test: After completing the fault understanding and board observation, according to the actual situation, the board is initially tested. The line detection may not be able to find the fault point of the board, but experienced circuit board maintenance personnel can Examine and eliminate a wide range of faults, paving the way for the next maintenance.
3. Component inspection: For component inspection, most of them need to remove the components from the circuit board through a soldering iron, and then inspect them from professional equipment. This process will damage the external integrity of the circuit board, so it is generally In this case, the maintenance personnel will not remove the components at will.
4. Fault maintenance: Through line testing, component testing and other work, the identified faults are handled, including line repair, component replacement, and transformation.
5. On-board test: the board that has completed the maintenance work needs to be tested again. After confirming that there is no fault, it can be tested on-board.
