Some of the necessary conditions:
1. Technical
The technique is to analyze a defective motherboard based on the signal and circuit principle (or related datasheet) and make a correct judgment between expected and measured values, depending on the individual's extensive work experience, learning ability for, observing, testing, and problem inference.
2. Instrument
In front of the motherboard analysis, the face is all kinds of electronic parts, their combination or logic, the most common form of expression is voltage, frequency, waveform, as well as impedance, in order to obtain the accurate parameters of these circuits, it is necessary to have a corresponding measurement instruments, the quality of the instrument of course determines the correctness of the inference. No instrument analysis will never have the ability to explore problems, and can only rely on the experience of others to share, although in a variety of electronic products have top Issue, but there is no reason to say that always the same part of the bad. It is also because of this in the treatment of different problems, will require a variety of instruments and tools. A kind of resistance card is to speed up the work progress, solve some no drawings can not detect points, and oscilloscope, Ammeter is used to present an electrical parameter.
3. Material
In the face of enough understanding and problem analysis, to find the problem, still need to have enough material (chipset, power IC,MOSFET, functional chip, Flash ROM) to replace the potential bad products you suspect.
4. Equipment
In the material, the fault points are satisfied with the situation, some parts can not be used in the use of chrome iron tools to solve, this will be a higher demand for friends, especially the BGA package of the north-South Bridge chipset, there is no dedicated tool can not replace the north-South Bridge these BGA chip, There is no way to make a reasonable judgment on the perfect period. The final result is to disappoint the customer.
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