Question

What are the faults and problems caused by the transistor inside the devices? A device suggested and explained its problem with mentioning the solution

(Please write the answer using the computer)

what are the faults that may occur due to the transistor inside the tv ? With a suggestion of solutions

Answer 1

Transistor Faults::

All semiconductor devices including the transistors are reliable, provided they are checked and operated correctly and there is no reason for them to fail at all in any case. Of course, they do fail and there can be for a variety of reasons.

1. Manufacturing faults in transistors

Manufacturing faults occur occasionally, usually in the new equipment. If there is a fault in a new transistor, it will often show up in the first few hours of checkup. If it operates correctly for this period of time then the chances are that it will continue is high. A large proportion of manufacturing faults can be detected by "soak testing" and other equipment. Items that qualify these tests can be confidently be put into regular use.

2.Component age of transistors

Transistors also suffer from aging However older equipment or systems containing transistors do begin to give more problems. The reason for that is resistors may change their values with age, especially if they are subject to heating effects caused by current flow through them. This may eventually result in a transistor operating outside its normal parameters. It is then that transistors may fail to work. In such circumstances, it is good to investigate the reasons for the failed transistor rather than just replacing it.

3.External causes on transistors

Sometimes external causes can even damage or even destroy transistors. Sometimes this will result in a transistor (or a circuit board) not working when fitted within a system. This can be because the very thin insulating layers within the device have broken down completely due to high−voltage static electricity, carelessly applied to the terminals. What is more sinister is that sometimes such discharges do not cause immediate destruction of the device, but do damage the insulation to such a degree that the device fails sometime (hours or years) later. Most mains powered circuits have some sort of protection built in that prevents damage in most cases, but it is rarely 100% effective.

4.Circuit design

Many faults can be found. The reason these recurrent faults occur is basically down to the design section. Home products are designed to be produced at a profitable price, and to give trouble-free operation for a time. Manufacturers are able to produce products that perform to carefully worked out strategies. Designing an electronic product for a particular life span, under conditions that will be very variable. However such faults as do occur usually follow a different pattern, and careful recording of previous faults can be a good indication of the future ones. These failures can affect transistors just as easily as any other component failure. Where faults occur prematurely, manufacturers often produce modifications to circuits to prevent similar failures in the future.

5.Semiconductor faults

When a diode or a transistor fails, one of two things usually happens:

  • A junction go short circuit

  • A junction go open circuit.

Now let us consider the case where the transistor in the tv are damaged then the best way is to check whether the problem is with components on the circuit board or some other problem. If it a problem with components present on the board then we can replace the old components with new ones. If transistors fail it is a bit difficult to change as it requires soldering. By experience we can handle different situations where we can can repair tv by ourselves. Some other way of getting the solution is to check in youtube.

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