Quick detection of PCB board failure problem method
PCB board is not a simple process to do the board, drill holes on the components like. PCB production is not difficult, it is difficult to produce after the completion of the troubleshooting. Whether it is personal enthusiasts or industry engineers, PCB circuit board in the debugging when the problem is quite a headache, like the programmer encountered BUG the same.
Some people have a strong interest in debugging PCB circuit board, as programmers in the solution of BUG, common PCB circuit board problems and many common problems in addition to circuit board design, electronic components damage, short circuit, components The quality of PCB circuit board disconnection failure a few.
Common PCB circuit board failure is mainly concentrated in the components above, like capacitors, resistors, inductors, diodes, transistors, FET, etc., integrated chip with crystal clear damage, and determine the components of the more intuitive method of failure Eyes to observe. There are obvious damage to the surface of electronic components have a more obvious signs of burning. Like this type of failure, directly to the replacement of the new components can be resolved.
Of course, not all of the damage to electronic components can be observed with the naked eye, such as the above-mentioned resistance, capacitance, transistor, etc., in some cases damage can not be seen from the surface, need to use professional inspection tools for maintenance , Commonly used with the inspection: multimeter, capacitance table, etc., in the detection of an electronic component voltage or current is not within the normal range, indicating that the components or a component of the existing problems, direct replacement and then check to see if it is normal.
Components, such as broken, whether it is observed with the eyes or instrument testing, can be detected, but sometimes when we are on the PCB board components, will encounter problems, but the circuit board and can not work Case. Many novice encountered such a problem Mozhe, and can only do a board again, or buy a piece. In fact, encountered this situation, a lot of time in the installation process components, due to the coordination of various components of the work, there may be performance instability.
In this case, the instrument has been unable to help, you can try to determine the current voltage according to the possible range of failure, as far as possible, experienced engineers may be able to quickly determine the fault area, but the specific components which is broken But can not be 100% sure. The only way to try to replace a suspicious component is until you find the problem element. Last year, my notebook motherboard water, in the master when the maintenance also encountered a fault can not detect, and in the maintenance process to replace the three components, namely the power supply chip, diode, USB charging components (that is, notebook blue Jack that, shut down the state can be charged to the device), and finally through a wave detection with the investigation to replace the suspicious chip, only to determine the edge of the South Bridge chip a short circuit.
The above is actually the problem of electronic components, of course, since the PCB circuit board as a foothold of components, then the circuit board failure is certainly there, the simplest example of the death of tin parts, due to the production process, PCB corrosion process, there may be disconnection problems. Encounter this situation, if you can not make up the line, then only use fine copper wire to fly to solve.
PCB circuit board failure is not significantly damaged in the case, check up really very troublesome, and in the investigation process, there will be a focus on the spirit, to be identified after the problem will be inexplicable sense of accomplishment, the programmer to solve BUG is This feeling, I often like to troubleshoot some difficult to repair the board, I think it is a pleasure.