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Tube TVs
Utech TV Model UTV-14NF / J does not turn on
960
hace 5 años
hace 5 años
Greetings colleagues I have this TV in my workshop it does not turn on only heard as oscillations in the flyback, I have reviewed the regulation and TSH stages and I can not find anything defective, the only thing I found damaged was a 100k resistance which was devalued located near the potentiometer that is located at the source of the TV, replace it with one with its true value and the continuous failure, as I have some flyback equal to those used by this I decided to change it to see if it obtained the solution, but negative, the fault continues, proceeded to measure voltages and they are not present, but when the flyback desoldo the + by voltages of the secondary stage of the source appear as all, so I presumed that it could be The damaged flyback, but as I told you, I changed the flyback and the fault persists. what the TV owner told me was that before the TV was damaged it turned on but it was heard as a kind of a current arc inside it, but that current arc lasted only about 5 seconds, the rest worked well, until on another occasion he went to turn on the current arc was heard and as a minute after being on it went off and did not want to light more, only the oscillations of which I already told him were heard. Thank you in advance for your suggestions.
30.814
hace 5 años
Hello Friend. And you solved the cold welds of the choper and those of the vertical section and checked if there were defective filters and those that are after the choper and diodes.
960
hace 5 años
colleagues do everything they told me, review the welds and no evolution, perform voltage measurements with all its components placed and the + b reached between 5v and 10v, the voltage that feeds the vertical was 8v and varienate, with the flyback disconnected the present voltages were correct as indicated by the same chassis, in the + b there were 110v, in the vertical output 22v, the tuner also its full voltages, also to both pin 33 of the micro and the memory eprom its voltages they were normal
960
hace 5 años
seeing that I had already tried with 4 flyback and not get a solution, I decided to try another TSH, although it was fine, because another TSH and the TV turned on perfectly, the one it uses is a d1555, but since I don't have it place a D5024, my concern is if despite the fact that both handle the same voltage and voltages, there are no problems due to the type of encapsulation, since one is large and the other is small.
960
hace 5 años
colleagues told them to put the d5024 it worked well for several hours, normal heating, but to be sure I managed to locate a d1555 and that's it, now fine. How do I value your answers?
960
hace 5 años
friend, I will value you as a solution, but first I want to know also how to value the other colleague
30.814
hace 5 años
friend. the comments cannot be valued only the solutions according to the new I repair. Cheers
30.814
hace 5 años
hace 5 años
Hello Friend. According to data, it is the d5024 3d transistor and has the same damper as the d1555. But if it doesn't get too hot, it's good that the good thing is that you have the TV. in test if there is no change of anything if it remains and if it hits the problem you can put the d2499 which is also condamper greetings
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