hace 6 años
Good afternoon Dear ELEKTOMAQ, first of all a cordial greeting .... I tell you that in our country Venezuela, when a high efficiency light bulb burned or stopped working, we simply threw it away and replaced it with a new one. .. At the present time Venezuela is experiencing the worst economic crisis and the country with the highest inflation in the world; where a high efficiency 40 watt bulb costs more than the minimum salary of a month of work even if you don't believe it; that is, a person with a minimum salary earns Bs 2,300,000.00 (Monthly). and a 40 watt high efficiency light bulb costs 2,800,000.00 Bs. To root of this situation we decided to repair them ... You can find a lot of information on youtube, but all of them are basically limited to the filament and possibly in some other data .....
I am going to provide you with some important steps so that you can repair the high efficiency bulbs effectively, this experience has been obtained by repairing many bulbs:
one-. First check that both filaments indicate continuity in the multimeter. If one of the filaments is open (No continuity) you can discard the bulb, but save the circuit that can serve as a replacement, in two ways, as individual parts or the complete circuit.
2-. The next step is to verify that all circuit diodes are good ... Why do we put the diodes in the second step? it is simply because if you have a bad diode, and especially if it is from the rectifier bridge, when you energize the bulb, the printed circuit will explode because of the short circuit that the diode is generating .... Use a tester in the diode position and verify the non-conduction and the conduction of each element (diode) ... It is very possible that some diode tells you that this short circuit, we recommend that you first grab the diode, extract it from the circuit and measure it again .... We have found this case very much, where it is indicated that the diode is damaged, but when we measure it outside the circuit, it is good and we put it back in the printed circuit.
3-. Proceed to check specifically the electrolytic capacitors, these are often damaged very often and its effect is that the bulb does not light ... The electrolytic capacitors usually bulge at the bottom of the capacitor, but in advance I inform you that you must measure it with a tester by that we have found capacitors in good physical condition, but when measured with a tester, they indicate only a small percentage of their value .... When you measure the value of electrolytic capacitors, remember that these can vary up to 20% of the value indicated in its package ...
4-. Regarding ceramic capacitors, these may be damaged and their physical appearance does not indicate that they are burned ... But to be able to measure these capacitors you must make a good study of them because the nomenclatures used, not everyone knows how to read ... it is important to know how to read these capacitors so that you can measure with a tester and know what result you should get. For example, specifically the capacitor that they use to join the two filaments, if it is not in its correct value several things can happen: 1 It does not turn on, 2 The filaments turn Red, 3 The lighting intensity is not correct .... These capacitors are the least damaged in the circuit.
5-. The two power transistors used are the ones that are most damaged in the circuit ... Manufacturers usually use NPN and Power Mosfet transistors ... Between the two they usually use NPN transistors as the E13003 or 13007 most frequently. Mosfet usually use them in high-efficiency 85 Watt bulbs from General Electric. NPN and Power Mosfet transistors can be diagnosed with a tester in the diode position, but you must necessarily extract them from the circuit for measurement.
6-. High efficiency bulb circuits usually have basically two to three coils ... these coils are almost never damaged and you can measure them with a tester in the continuity position.
7-. The resistors are usually sporadically damaged, but when they are damaged, we are specifically talking about very low value resistance that is connected to the NPN transistor. This resistance usually has a value of less than 1 ohm, but when you measure it with the tester it usually indicates values in mega ohm ....
8-. Finally, in most circuits there is a component that looks like a diode, but it is not, this component usually has the nomenclature of DB3 ... In all repairs made, we have only found a damaged DB3. Unfortunately with a tester you will not be able to verify if the item is in good condition or not. To do this you must build a small oscillator with a Led that will indicate the good state of it.
Well I hope this really helps something.
In conclusion, when a high efficiency bulb is damaged, the bulb will not necessarily be damaged, any element that is in the circuit can be damaged and our experience in this has indicated this order of importance in the review:
one-. THE FILAMENT (THERE ARE TWO)
2-. NPN TRANSISTORS
3-. DIODES
4-. ELECTROLYTIC CAPACITORS
5-. CERAMIC CAPACITORS
6-. RESISTORS
8-. COILS
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