By only knowing how to read electronic schematic diagram and testing electronic components were not enough to make us a good electronic repairers. Many faults can’t be detected even if you know how to accurately test and check all the electronic components because those faults only can be detected by simply performing a voltage test. Do you know that quite a numbers of Monitor problems I have to perform a voltage test in order to locate the defective components? Yes, if without voltage testing, I might end up can’t find the fault and the Monitor have to be return back to customers. What if you return many Monitors back to the same customers? Of course your business reputation would be affected and worst if your competitors (other electronic repairers) be able to repair it. You would definitely lose out the customers and is very difficult to get back his trust again about your capability to repair Monitors.
I do know lots of electronic repairers especially newbie’s do not have the courage to perform the voltage test especially Computer Monitors and Television because they were afraid of the high voltage and get electrocuted. Well, if you want to work in this line and choose not to learn about voltage testing (because of afraid), then you are truly missing something that can help you to repair any equipment fast. After all, voltage testing is not that as dangerous as you thought to be. With some guidance from repair friends or even you test it on your own (practical) and protection from isolation transformer, I don’t see any other reasons you don’t want to do the voltage testing. Besides this of course you must know the safety guidelines first in this electronic servicing field.
The real challenging question now is even though you know how to perform the 2cl2FL; this does not guarantee that you will definitely being able to solve the electronic problems! As to why you can’t solve the problems depends on many factors such as:
– How well you are in understanding the functions of electronic circuit (assuming I’m talking on the Monitor circuit). Some Monitors circuits can be very complicated to understand it.
– How good you are in tracing the electronic circuit (assuming you are tracing from the source to the faulty components) because many electronic repairers will lost track and can’t go further to detect the fault.
– How knowledgeable you are in understanding each function of the electronic component. For example, if no signal flowing to the base of a transistor, of course there would be no current flowing between the collector and the emitter. Another example, what do you expect the output voltage will be if 100 volts is passing through between a 10 ohm resistor and a 10 k ohms resistor?
– Sometimes in order to solve a problem we accidentally create even more problems due to that we do not have the capability to hold tight the meter’s probes causing it to touch on other pins while measuring a components (says is an IC or a transistor). This would cause the whole equipment to shutdown or even burnt the components. How many of you have done that before?
– We must also know what the range of the meter setting is in order to test the electronic circuit accurately. For example, would you test the secondary output voltages when your meter is set to AC range? Or would you expect a reading when your meter’s red probe touches on a cold ground?
From above, these are the things that you should know if you want to be successfully able to perform a voltage test on any equipment. It is not that easy to absorb everything that I’ve just mentioned above but if you have the passion to do it (I mean learn everything from reading electronics books, visiting forum, doing your own practical test and etc) then you are giving yourself a chance to learn something that will truly benefit to you.