Rca does not turn on
Suggestions.-1.- remove the flyback and the hot, place a 680 ohms 20w resistor of the b + to ground, this so that you can work only with the source. 2.- Arms a vpp probe, I send you a diagram, this is placed in the driver's collector, you give it on, and check if you have vpp, if you have this signal, then place the probe in the base of the hot. and likewise check the signal.- this allows you to check the source until it is well, and check the oscillation that the jungle sends. comment. Regards. Felipe ascencio
Good Night: If you found the blown fuse, it is a clear indication that you have or had a short circuit, the PTC will not always be the cause, it is one of the components. The trouble is that you only replaced the fuse and the PTC without measuring anything at all, and without taking any example of a system that dampens shorts that have not been overlooked or missed. If I found the STR exploded it is clear what elements associated with it. They are in poor condition, such as low value resistors.
thanks Felipe for your advice, and thanks neg2013 that I think you suggest me to keep checking right?
As you can see, everyone has their method, however the resistance gives the ease of checking the b + without having the flyback or the hot. The teachers talk about the focus, but where I live there are no lights, so we use the resistance, and as soon as the b + is correct, with the probe you can check the oscillation without having the flyback or the hot spot. also for the space that remains you can check all electrolytics, without problem. greetings everyone.
Well, first of all you cannot trust that because the pilot LED does not appear, the source does not work, you have to locate the secondary voltages of the source and measure them, to see how they behave. You can start by removing the Horizontal Output Transistor (TSH), measure it and test the source.
hello the truth I do not know what to do for the doubts change all the diodes of the bridge the 4, the ones of the polyester, the resistances the thermistors, that is to say all the components of the primary one and nothing does not light, advice please. Thank you
Mr. Sandes.- There are things that have to be done based on a method, it is not a whim. Taking up some of the information he sends to Mr. Miguel, where he says he has 202v.- But which entry and 202v of what? vcd? vca? .-) .- Questions: remove the flyback? Do I place the indicated resistance? Do I assemble the probe? .- Rules. 1.- the vca multiplied by 1.41 is equal to the vcd. So assuming that your AC voltage is 220 by 1.41 are 310vcd. - This is the voltage you should have in the input filter. I send you a diagram that we use for a switched source .........
As the probe is used in the primary source, to know if it has oscillation, which is the same to detect if it has vpp (peak to peak voltage). If you have any doubt as to what is a rms voltage and a vpp, you can ask, to unify a criterion and help you better.- Rules.- The vpp is equal to the vca multiplied by 1.41 and this result multiplied by two.- 220vca by 1.41 they are 310vcd, for two they are 620vpp.- the probe must indicate when you give it on, between 500 and 620vpp.- .....
As a basis, we will use the diagram sent by Mr. Miguel, to indicate where it is measured and where the probe is placed. In this way we will work in the primary source. Comment any questions. greetings all.-
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Hello I tell you what I found after continuing to review and what is the problem I have now, when reviewing I found the varistor that was missing a bit, I measure it and evidently it shortened just like a three-ohm 22ohm, I change both a new varistor and the resistance, now the problem remains the same and now not even the source capacitor charges me, I measure other resistances and diodes of the primary and I find nothing wrong, I really do not know where to continue, the fault I have in the primary I think, but I don't know what to do anymore, if you can help me, thank you
thanks Miguel, if you check the bridge, the diode the fuse, I only have to test the power cable that is not cut because the neutral is alive, also test voltage at the entrance and I have 202vts. hug
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