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lg tv without volt + B

Francisco javier Briceño
hace 5 años
hace 5 años
greetings to the forum, I get a lg tv mod. 21fx4rv chassis --mc-059a and has the sig. problem when connecting the power and giving the main switch the stambay led turns on and all volts appear after a few seconds the led goes out and all volts disappear. remaining at zero volt. Disconnect the resistance that feeds the fly-bak pin and the fault continues, replace the integrated str w 6753 and nothing, take volt measurement. at the output of the optocoupler and there is voltage but it is unstable rise and fall, change the resistance 816 where the volt that detects the sampling of the 110 volts of + B passes and nothing will be the problem
willyboy1420
willyboy1420
1.072
hace 5 años

You checked the multiregulator, the TSH, ICVert, ICAud ...

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willyboy1420
willyboy1420
1.072
hace 5 años

Mira connects the TV (without giving it power) that is in standby mode, and measures the voltages in the secondary and discuss them ... Voltage in C835, C826, C831, C838, in the IC804 (pin 4 and 2), then when you give power you measure the same .... C813 C801midelos but change the C801

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wilson sepulveda
hace 5 años

Hello friends that means that the TV is being protected because some protection is activated in the different circuits also the cause may be the flaybag when you power the voltage on the (+ b pin 3) of the flaybag rises momentarily while the led turns red says

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CARLOS plc
hace 5 años
hace 5 años
When you have this problem you have to check or change the error amplifier, it is an IC that gives you this anomaly in 30% of the cases of an LG according to my workshop history. Check and discard this step.
Francisco javier Briceño
hace 5 años

thanks for answering, regarding what the friend williboy1420 says I do not give him apower I am saying that when I plug in the power the stambay light turns on and all the voltages including the + B appear and after 15 seconds the voltages disappear and I turn off the light of Stambay, and what the friend Carlos says I will review but I would like it to be more specific in the plane which is the number of that integrated

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CARLOS plc
hace 5 años

look for an IC SE110N or IC SE130N that's the error amplifier

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Francisco javier Briceño
hace 5 años

Hello friends, I got the diagram of this tv and studying the plan I realized that the volt. that feeds the pin of the fly bak is by means of another resistance, that is, the one that I had disconnected was not brought by the + B, there was an error I proceeded to disconnect the volt + B and the volt. they were normalized, check the flybak and this one was short - solution change the flybak

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