Tv led jvc lt32da350 does not turn on
I think that the new system of I repair is not liking me, since it only allows an orientation and this makes it difficult to reach the solution, so I put this comment to you, so as not to burn the answer and continue to advise you, as they already told you it is important diagram of the source, so I ask you to upload the part number of it, to upload the diagram and advise you with it .... greetings.
the number: rsag7.820.5268 / ROH. In the primary change the ncp1251, I think it is the oscillator ic, and the v936 is an mmbt2907a, they were shorted. I have no voltage in the secondary. It does not start. Some guidance, thank you very much to those who responded. Greetings to the forum. I am recently learning how it works to respond, in short, in everything.
Hello Francisco, it is true what you say, how you help lucas with the repair of the source risking a solution, to me to top it broke my crystal ball, jaajjajaaj the good thing is that you can edit the answer, so you can go commenting and editing, but it was easier before, we will have to evolve :)
Good to the forum. Download the diagram. Now I am measuring components. When the source did not oscillate, I changed the ncp1251 again, the source starts up, it turns on blue (constantly flashes). : 54volts..vd 902: 53.5v. and in vd813: 10volts. some orientation. the voltage in vd817 / 9, varies from 3.5 to 4.2. some suggestion or orientation. Thank you very much. The truth is that the premiere is convenient.
Hello, good morning, thanks Tobias for sharing your knowledge, and for your time. After having measured everything back, the r843 resistance, was devalued, is (47 ohm) .I did not have a temporary one of 75 ohm, until I got the smd. the source started stable. Now I'm testing. Everything seems ok. Very grateful Tobias and everyone who guided me. Until next time, big hug.
attention with c820 and zd801, at that point there must be 16 volts !!! but not
I add, it is better that you work with the source disconnected from the main, a source with a bad function you can shoot and spoil the main
Our goal is to get 12 volts very stable before connecting the main
two questions to follow
1) you didn't tell me if you have 15 volts at the point I indicated in the photo? [/B]
2) It is also important [b] to make sure there are no shorts in the secondary , an easy way, you measure all the diodes in search of shorts
luck with the tests
Closing the issue I want to add for Luxas that starts, Jose who is interested in learning and future readers looking to solve problems of this type of sources, write this down
The mosfet when they are shorted have the bad habit of taking with him the components that are from the gate to the integrated driver even, in this case the ncp1251, always when you see this type of breakdown it replaces: the optocoupler and the tl431, these are responsible for regulating the output voltage, being between the hot and cold masses are very susceptible to overvoltage peaks whether they are line or atmospheric.
also check shorts in the secondary and electrolytic in general (I clarify that still in these sources do not change electrolytic)
Successes and see you next time
If you liked the answer you can comment and give the positive vote ;)
Sorry Lucas, I invaded the subject, Hello Jose, I left you with information that you had requested ... copy and paste the information in your browser ...
http://elnuevo.yoreparo.com/tv/televisores/preguntas/1594011/pregunta-a-tobiastv
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