The perfect solution to display fault

Oct. 26, 2010 - PRLog -- First, the sensory diagnosis

The so-called sensory method, refers to a failure in the maintenance of maintenance personnel through the eyes, ears, hands, nose and other sensory organs, as in medicine, said Wang, Q., Wen, cutting and other methods. To understand the causes for the failure and determine the fault location of the site. The main techniques used sensory method is as follows:

In the former case by observing the image to open failure phenomenon, failure to think of where the parts. Open chassis components after the circuit by observing the color and shape, if the color anomaly, many parts of the fault lies. If the general resistance of the red color ring, in the case of the current high temperatures the surface becomes black, should be the component failure on the part of Lenovo in the same case, the black wire wound resistor into a gray, are burned omen . Another example is burning fuse, usually burning fuse can be divided into three large to firing, ① Fuse no color change within the shell broken glass; ② fuse into a deep yellow inside; ③ fuse internal to black or even break the glass shell. According to its degree can be burned to set off the location and severity of faults. Another example is the component with copper to green was damp, filter capacitor voltage burst is generally too high, ignition coil protrusion of a small bag (for the smooth flat surface under normal circumstances) is usually an internal short circuit coil.

News There are two implications, one is the nose smell the flavor. If boot burning smell, mostly for high-power transistors, resistors and other burned; boot after the ozone smell, mostly in high-voltage component insulation breakdown, leakage or capacitance smaller reverse process pressure is too high and causing ignition.
Second, is the power after the ears to hear their voice. The normal display in use are the silent sound silent change was an exception. If given in high voltage ignition popping sound, machines, alarm, etc. issued by the creak. More serious for the machine overcurrent overvoltage, such as in-line tube causing the power to issue a bad squeak, indicating that power supply overloaded.
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