Tienda | Forums | Blogs | ES |
 

TV Daewoo turned it off and the flyback is sending voltage

Follow
This post was translated, if you want to see the original version click here
good afternoon I have tv daewoo chassis cn 001n works fine but when giving order to pay the screen it is left with a shadow check and the kinescope is oscillating and flayback lowers its + ba 103 but the output voltages continue to come out can help me
  • friends solved was the q403 I got confused because the chassis was screen printed as 453 but I looked for it with the diagram and voila
    thank you very much to my friends who helped me thanks from Venezuela

2 Proposed Solutions

Hi. If the horizontal continues to work, it is because the jungle does not cut the pulse of the Hout.
Remove the jungle. Clean the plate well and weld it well. without leaving traces of tin or attached pins.


No one corrected this mistake I made as rushed. For not looking at the diagram first.
SOLUTION ACCEPTED
Diagram here:
https://www.mediafire.com/file/duw9m7hc21fc5vs/Daewoo_CN001N.pdf/file

What voltage do you get at the Base of the Q403 in both STAND BY and the ON order?

Check the good condition of the Q403 and surrounding components.

  • I already changed it and checked components I already told you the base voltage

  • thank you i already have the diagram

  • 1 month ago

    Avatar de Javier Chavez C

    The Q403 grounded the horizontal oscillation pulse for the TV to turn off.

    If the transistor is OK, then also check its connection tracks, especially the Base path of that transistor.

  • 1 month ago

    Avatar de luis tartaglia

    The pulse or voltage is the same.
    Whether you measure it at the base or in print halfway. Anywhere . It is the same that goes from pin 16 of the micro to the base and to the Q851 that regulates the source in 133v.
    Don't measure there anymore because if you turn off the power, you don't regulate the 133v but 103v as you say. Enter at rest. (ST) The same goes for Q403.

  • 1 month ago

    Avatar de Javier Chavez C

    The fact that + B goes down does not mean that the TV is going to turn off, in these models they carry the transistor Q403, there to send the oscillation pulse to ground.

    You burst into my line of comments to distort my opinion that if it were real I would accept it honestly because we are not perfect.
    I only ask for some respect in your opinions, and allow the consultant to perform the recommended tests and report them.

    The results will indicate if you were correct or not.

  • if, when giving the order to turn off the + b, it goes down to 103 and I turn it on and up to 133

  • 1 month ago

    Avatar de Javier Chavez C

    The important thing at the moment is the response in Voltages of the Q403 both in its base and in the collector

  • tomorrow we continue friends the electric light went out

  • 1 month ago

    Avatar de Javier Chavez C

    OKAY . I leave a test.
    When you turn off the TV (OFF) and it is still working (swinging) ... bridge the Q403 Collector and Transmitter.

    Please report what happens.

  • thank you you were correct and you were the first to suggest it

  • 1 month ago

    Avatar de luis tartaglia

    You did not report what one asks you to continue in the repair or the thread of it. As colleague Chavez says. And I don't cut the procedure step by step. To reach a conclusion. You commented that I change the Q403. No positive result.
    I was the first . Check the schedule of contributions. Also the editions made later in the development of the theme. .
    Reason I said that measure where you measure the result will be the same. Either measure on pin 16 of the mic or on the base of Q403. Whenever everything is in order. Nor did he comment on the result of one or another test. That in short

  • 1 month ago

    Avatar de luis tartaglia

    Definitive pointed to the same. There you cut the thread of prayer. And you Javier are following the same as me. Or not? You are already doing it on other topics.
    Suggest something different or add to what was provided or support what was said and if something was wrong. Correct so that those who consult do not conduct unsubstantiated or erroneous tests. Add and do not contribute the same. Said in other words. It also makes contributions as possible solutions by asking. Do that in the form of a comment. Not as solutions. While it is true that the solution is achieved many times because it leads to a

  • 1 month ago

    Avatar de luis tartaglia

    To a diagnosis or reasoning. And logical the solution.