TV 55 LG MODEL (LG 55 LH6000 turns on 3 times led and is protected
Not that I have to check, the screen is black, but the issue of the diode will not affect the one that the LED lights, it is also rare is a new TV less than a year of use
Thank you for the help, I told you that I took a leg from the diode that gave me an error and I measured it and it was good for me and it did not give continuity, that something else could be
that the diode has a parallel resistance or there is a short electrolyte, it is better to look for the short in the electrolytic ... if there is a short diode that short is going to be reflected in the electrolytic, you understand the idea;)
won't it be that your backlight goes out? What do you mean protect yourself?
Thanks Tobias, when I say it is protected is that the LED goes out, at 3 blinks and the diode was false I took a leg and when measured it gave good, the capacitors are about 5 and are not damaged in sight, it is a Very new TV or a year of use
Thank you so much, I'm going to take it out of the plate and measure it to see what happens, and hopefully it's just that,
Tobias thanks for continuing to help me, look at the truth of lcd I am starting, repaired other things like microwaves, blenders, things with less electronics, but I already repaired 2 lcd before, only that the damages were in sight, and on the led stanby, this when connecting the tv to the power turns on there when I turn on flashes 3 times and turns off, trying to turn off the TV does nothing does not return to stanby, and black screen all the time, I have to take the power outlet and there is the process repeated, (WHEN YOU SAY BLAK LIGHT YOU REFER TO THE LEDS OR WHAT
ahhhh you are handyman =)
backlight is backlight, refers to the backlight that turns on the screen
Watch this video to see how the source / backlight circuit works
I want to tell you that you are facing a very complex device and one of the largest and most expensive, I accompany you on the adventure but the responsibility is yours.
Then remind me and I indicate some lcd courses that were given in the forum, for now I leave you this theory video
https://www.youtube.com/watch?v=XWhp-2l4auQ&t=63s
Tobias, I am still grateful for your support and if I know that it is my responsibility, I have all the security measures to take care not to damage the screen that is the most expensive, in addition to handyman as you say they are an industrial security engineer, well returning to the subject (the LED stays off and does not turn on, I have to disconnect it from the power grid and there is a turn on again, it is complicated to disassemble and reach the LEDs or Blas light but I think I will have to do it and check that everything is fine here I will continue
Excuse me, the handyman thing meant that he likes to play without knowing, self-taught, all good
since it is an engineer we can see it further
Did you understand the theory? It is a constant current source, she will increase the voltage of the LEDs until the expected current circulates, if that current never circulates there will be overvoltage on led +
When you connect the TV the source delivers a standby voltage to power the main,
when you give the power the main returns the power on level to the source and it delivers the main tensions
Three cases
1 - That the source delivers the standby and the main does not return the power on - main malo
2 - That the source does not deliver tension - bad source or short main
3 - That the main return the power on and the source does not deliver the tensions - bad source
What is your case?
I thank you bro God I paid you, but I decide to leave it there, there is a little fear because if it is true that TV is expensive and the same if it is a problem in the LEDs it is a risk to disarm a cordial greeting from Ecuador, although I am Cuban, I hope you help me in other occasions
