hyundai tv does not turn on
Televisor RCA TV
Televisor RCA TV
Suggestions.- 1.- Never place the voltmeter in the hot collector there are peaks of a thousand volts, you can burn the multimeter.- 2.- check if the filament is on.- 3.- unlink the filament, you connect an external source and leave it on for about 10 minutes, then you give it on and you also increase the screen a little (just a little), when you give it on look at the screen, this in case you had a problem of the vertical stage. 4.- having 180vcd at the base of the kinescope means that you have oscillation, so be careful. Cheers
Mr Marlon.- If you have any doubts, you are right to ask.- The filament of the kinescope at 12 VAC / VCD melts, the voltage it requires is 4.5 / 6VAC / VCD.- You will have to search the network: preheating of the kinescope filament , this so that you understand what it is intended.- I will send you a diagram to analyze it.- Generally one pin of the filament goes to ground and the other goes to a resistance of 1 ohms, you remove this resistance, this so as not to cut the circuit. make sure the filament pin is free. We use a 6VAC transformer and connect it ........
........... one point to ground and the other end we connect the original resistance. From the diagram I sent you just look at the way of the filament. But I repeat, as you have no experience, investigate on the web, comment if you fully understand the procedure, this to unify a criterion and not spoil the kinescope, because if this happened it has no repair.
Hi, thank you for responding, look, I have not done the test you suggest, but reviewing the following I see on a plane that I will find the choper, some vltajes should come out as som 19v I have 18.8 16v I have 15.5 25v I have 25v 180v I have 180v and another of 110 and tego 111v told you the 15v should feed a regulator 7812 which feeds another 7805 this voltage comes from the choper (15v) but they reach a transistory of the ism has to reach the regulator to feed it well that's what I understand my question is if that transistor should send the automatic voltage
To send a photo of the diagram .- mark the pencil ... then the landscape ... select file ... mark the photo and give it to open ... send to the server ... accept ... send.
To know the voltage that the input filter must have: check the vca and multiply it by 1.41 the result will be the vcd in the filter.- We do not have the diagram however you can: 1.- remove the 7812 and place an external source of 0 / 12vcd you connect your ammeter and you apply voltage, you can see if the "line" of the twelve vcd is fine, the same with that of 5vcd.- It is a way to check the "power lines" ......
......... without turning on the TV. I agree on your assessment regarding the source. To send the diagram you would have to scan it and then send it.- It is easier and faster by photos.- Something practical: place a neon between the flyback's core and the body of the flyer, give it on and observe that the neon should light, this It is an indication that if you have oscillation. This is why you must be careful. Cheers
Which focus? .- If you refer to the neon as the "focus"; The neon is not connected to any side, the neon is only placed between the core and the body of the flybck, you stick it with an adhesive tape.
You can wash with two parts of thinner and one of alcohol. Note that you do not have more "cold" welding. - For the filters you need an ESR meter, comment if you have, we can send you the diagram of one that we use for quick check. Check the b + voltages on the flyback pin. check the voltages that feed the vertical ci because these are the reference.- the filters of the primary source and secondary source.
You will have to check the filters, you have an ESR meter, we can send you the diagram.
It is most likely that they are filters.- From the diagram that I send you, we place it in a multimeter truper. the red punts mean what we had to adapt by the impedance of the meter. we have an analogue and we have compared it with this and it is effective even when it has few components. Search the web for more data so you can download videos and get more information.
Mr. Marlon.- Before telling you to change or buy some material, either because it is expensive or because the CD is far away, (we need to lose 6 hours to go to the CD to buy material) .- You will have to check the voltages well. because an increase in b +, or a defect in the oscillation could cause the flyback to "make a noise" .- Talk to the technicians and comment that the vertical can not make the noise. Meter for filters. This will serve you now and for future repairs ........
......... so if you have to buy a material it is better in something that is a tool. You can try replacement with another chassis that you have on hand. Even in the same chassis, the goal is to remove the noise. From the vertical ci check what your voltages are, look for the datasheet and compare. see if the ci has heating. If possible, send a photo of the source and the vertical section. Cheers
hello friend I had problems with my internet I had not communicated ,, I would hear the noise coming from the primary source check the main 450v 150mf and was damaged inflated from the bottom, now the noise disappears is heard at the very, very minimal , my question is to place a capacitor of 400v for 200mf bone 50v less and 50mf but that does not affect the circuit over time? Another question was voltage on the main filter, which replaces and does not measure voltage. This appears high voltages and disappears as if it were measuring high peaks where there should be 160
Mr. Marlon.- As proof it is acceptable that you place one of 400v instead of 450v, the ideal is that you place the original value, since the sources are already designed with the value of those components. especially because speaking of a vca of (120vca x1.41 = 169vcd x 2 = 338vpp); Try to place the original value and check the filters of the primary source and the secondary source.
