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Tv lg flatron model: rp-21fe60 does not turn on, no led stanby

edgarrodriguezgonzalez201
hace 5 años
hace 5 años
Greetings colleagues, the client tells me that this TV started to fail at the beginning with the stanby led on but when giving the power order immediately after the second the LED went out and emitted a sound at the source of equal duration, This tv model uses A D2627, LA78040, STRF6654, the TV was ruined and after a while they tried to repair it, the current condition of the TV is that it does not turn on the stanby LED, checking the source perform the following tests, check the tsh and it's ok, check the fusistor in the line of + b, FR403 and it is ok, check filters of the source and diodes and they are ok, raise the base of transistor Q16 to see if there is any protection activated (vertical, over current) and the stanby did not turn on, remove the vertical ic without results, now disconnect the horizontal transistor connect the tv to the electrical outlet and the stanby led turned on, here my questions: 1.- Why does the LED not turn on when the tsh is connected? 2.- Will the flyback be bad? 3.- How do I discard or what tests can I do to be sure that the flyback is damaged? I appreciate all your suggestions in advance. Greetings from Venezuela
franciscovallarta
hace 5 años

Try another tsh and check the tuning capacitors between tsh collector and emitter.

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edgarrodriguezgonzalez201
hace 5 años

Thank you for answering friend franciscovalladares, I forgot to mention that I already tested with another horizontal transistor and also look for shorts in ceramic capacitors near the yoke and tsh without results

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Juanjo cortes
hace 5 años
hace 5 años
With the tests you've done almost 100 percent that is flyback
edgarrodriguezgonzalez201
hace 5 años

Thanks for answering, I will try to try another flyback.

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edgarrodriguezgonzalez201
hace 5 años

I told all the colleagues, I did the tests they recommended but I did not get results, fortunately I had an equal chassis whose fault is that it is protected and use this flyback to test and the TV turned on, which gives the first proposed solution of the correct Juanjo Cortes friend, I also appreciate all the contributions made by the other contributors. I close the post, greetings from Venezuela.

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Juanjo cortes
hace 5 años

There you are going thumb up friend ... badly that you had a flyback to try .. it happens to me many times that I do not have some certain components to test and makes repair difficult .. a greeting from Argentina and guide me repairing

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baldomero sanchez poot
hace 5 años
hace 5 años
yes, everything seems to indicate that the fly back is short so when connecting the voltage + b disappears if you do not have to check it take it to check to discard it or change it if necessary.
edgarrodriguezgonzalez201
hace 5 años

It is true that LG TVs are always damaged by the flyback. This flyback is BSC23-N0121 (M), would someone have the pinout data sheet or do you know any replacement, or if I can adapt one?

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luis tartaglia
hace 5 años
hace 5 años
Hi. It does not comment on the source output voltages and if they are maintained. For that you must test, which does not comment on whether you did them or not. Put a focus on SERIES between the + b and the flyback pin and see if the light turns on in ST mode. and the LED. If you don't turn on the spotlight, measure tension. + by without taking the tester from there gives PW. if the focus manages to turn on ST something in short there is. 100w to 200w focus. You can try the flyback a bit with the 200-meter scale tester. Withdrawn the same. Measuring their primary and secondary that do not have continuity. Then all the pins with respect to the pacifier.
urbinajuan211
hace 5 años
hace 5 años
Did you check the regulator yet?
edgarrodriguezgonzalez201
hace 5 años

Regulator purpose I would like to know how I can test the STRF6654, what voltages should your pins measure under normal conditions and if I could test with a STRF6628 that I have available?

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urbinajuan211
hace 5 años

Pin 3 of that regulator should reach 27v. In some cases they do not reach you because a 27v zener diode comes in short or simply stops working. Measure that the 27 v are arriving if they do not arrive as surely as it is that that diode change it so measure well

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franciscovallarta
hace 5 años
hace 5 años
for the model corresponds to the chassis sc-023 the flayback used is the 6174v-6006h the replacements suggested by the colleague victor, you can check them in the following. post. https://yoreparo.com/tv/televisores/tubo/preguntas/1364396/cual-es-el-remplazo-de-flyback-lg-6174v-6006h

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