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LCD TVs - LED

lcd samsung Ln32r8 source Bn44-00192a fault does not enter 24 and 12v

Abel Gonzalez
hace 5 años
hace 5 años
samsung.png source circuit [721.12kb] hello lcolegas. I tell you that I have a 32 "samsung lcd mod Ln32r8 that came to me without turning on stb led light. Take out Bn44-00192a chassis source, I noticed that I had a lot of concentration of dirt and dirt. I cleaned it, reinforced the welds and the television tries to turn on now . it turns on blue acrylic light for half a second and then the television is in standby with the difference that the light flickers for seconds. Turn on a few seconds and turn off and so on. I check the source and I can't tell which component is more, I don't have short transistors or open capacitors. However, when the TV is on, a small shriek is heard, almost imperceptible. With the help of the Sanfalla member, I managed to start the source manually and ready for the main. In this way I have taken the measurements that I detail in the diagram that I leave attached. I have neither 24 nor 12 goes the outputs I have reviewed almost all the components and I cannot find the fault Any help is welcome and I hope I'm not so heavy on the subject, I want that television for me. thank you very much to all.
franciscovallarta
hace 5 años
hace 5 años
check the operation and polarization of the icm801 if you do not have much experience it may be more convenient to change the entire source ... greetings.
Abel Gonzalez
hace 5 años

thanks, I have some experience but I am turning on more than in the technical secondary. I am an electronic technician. I still have it. If you look at the drawing that I leave attached you will see that I took some measurements of the icm801. Regarding the operation I will look for your data sheet but any advice you can give me would be very welcome, thank you very much

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Abel Gonzalez
hace 5 años

Well, according to what I was researching, the icm801 is activated with 12 volts or more of what I have in ic vcc which are 8.4? Is this why it doesn't work?
those 8.4 give me as a result of the 13v that pass through the octocoupler that sends that voltage to the circuit configured by the ktd1347 that delivers the voltage ic vcc t for the icm801 and the icp 801s qye which is a tda4863. Could this be the cause of the breakdown or are they normal?

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Abel Gonzalez
hace 5 años

Thanks for your input, it was very helpful and that way I managed to repair the TV.

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