Hello new My dear friends here we are back with the video number 2 of the screen repair LG model 49LF5100
In video number 1 we taught how the fault was representing us this screen which is that we were not representing video signal
We have followed the repair process we have reviewed the status of the T-Con card and we have noticed that it is in good condition
We have done the repair process we have disconnected the flexible cables that connect to the panel
And we have noticed that the problem is in part A of this panel
Okay then we in this video tutorial we will follow the repair process in order to find the defective component
and give him Okay solution This work we are going to do here is very special because it is a very very large panel
Which would be worth rescuing the technique in this video tutorial I'm going to teach is very simple
You'll realize that in an easy and practical way we will give solution to this failure so you stay until the end of the video
And if you have not subscribed to the channel I invite you to do it and activate is the bell of notifications so you do not miss
None of the videos that we get to channel Okay
Then proceed to dismantle this plastic part to have access to that card very well we continue
Very well gentlemen and in these cases it is necessary that we have the whole frame but that would imply that
We have to move the panel then we here if we analyze carefully
We realize that by just uncheating this plastic part is enough to have access to that card
As you are observing here this is enough for us to have access
To the card pre-panel and how you can see there are the components of that card
We've taken the surprise that we only see here
Some SMD capacitors and some Nano resistors
That's all you have this card
Okay then but we're going to follow the process of
Repair as you have taught it
What we're going to do next is this
The flexible cable must be connected to the
How you can observe already connected and what we are going to do is inject voltage into the card
Pre-panel and this we will do according to the reference points that we have presented on the T-card with Okay
It is worth mentioning that if the boy is damaged then this is going to be a problem to rescue this panel
Very well for what we're going to do you need to have a source lab an adjustable source at least 5 amps
and the voltage that we are going to inject in the reference points the T-Con card as I mentioned
It's exclusively 4 volts Okay there at the landmarks we found
Voltages up to 28 volts 16 Volts as we observe in the video number 1 and the point marked as VGL marked with-5 volts
We're going to work with four volts with that enough so we won't be going to burst
or explode some component by injecting too much voltage
So I'm going to put my test leads here and we're going to head for the T card with
And look for reference points marked as VGL, VGH and VDD
These voltage cue points that we talked about in the number one tutorial
Now what I'm going to do is next I'm going to inject this voltage into the dot marked as Vgh
There I am injecting the TV is offline
And how can you appreciate I don't have amp consumption
Which means that this line is released
In this line we have no problem now let's check VDD
How you can see there is marking me 1.9
Consumption amps
There we are 1.9
It means then that the line marked as VDD
We have a serious short circuit
Now to inject voltage into the VGL reference point
We have exchanged the tips
Because we remember that here
The negative voltage
But how can you see we have no consumption
of amperage which means that
In the only point of reference that we have
Problem is the point marked as VDD
ok
Now we have discovered that
The marked dot how VDD is the problem
Then we will do the following
What we will do is
Check whether any of the components on the pre-panel card
As they overheat
Okay then what we can do here is with our fingers
Touch here with great caution
Lest any component be overheated
And go burn our fingers
We can do this
To make the work quick and practical
But I'm also going to show you other techniques that
You can apply to discover
Which component is overheating
So what I do is I injected voltage
In the reference point from which we have discovered
Which is marking me amperage consumption
Pero acá puedo darme cuenta que ningún componente de éstos Se está calentando
Okay then let's review this other part
Here we have the following flexible cable that connects to the panel
And how can you observe
It also has some components over here
We're going to apply exactly the same technique
With great caution we are going to touch those components
And we're going to inject the voltage
And indeed over here
We have a component that is being
Overheating
Okay So here we could have the problem on this screen
In order to be able to discover also otherwise which components are about overheating
We can also occupy this aerosol
This is a freezing aerosol
But if we don't have this kind of aerosol
We can occupy flux that you are observing
That I have here or if not because you can also use soldering paste ok
And what we do is this
Place a small portion
of this soldering paste or flux
And we're going to put it over the components that we've detected
They're re heating
We're going to put a little flux here and then we're going to inject the voltage
With which we are working on the reference point that we have encountered that has problems
Y vamos a verificar si esos componentes comienzan a Recalentar
So if you heat up you're going to generate smoke
There as you can see
We actually have that capacitor with a very very strong leak
So this is what the T-card with detects therefore it comes into protection
So now we clearly know that it is this SMD component that could be causing this breakdown
means we're going to have to replace it then that's the first thing we're going to do here then I'll proceed to extract it
And then we're going to look for a corresponding replacement
All right now regarding the replacement I have here many recycling cards
In which you will find many of the capacitors that we have found damaged
Remember that for a replacement of these capacitors it is necessary to take into account the color of this capacitor
And similarly the size Okay I already have it here now I will proceed to install it
Very well how can you observe we have already installed
Now what we are going to do is check the voltage that now emits the T-Con card
Remember that when the flexible cable was connected because obviously the tensor did not generate the corresponding function
Because the T-card with went into protection
But now with having eliminated that capacitor that was causing a fault is expected because the T-Con card
Start working properly and the fault has been resolved
All right then let's check here we're going to locate at the main voltage reference points
of which I have taught them and we will take them reading
Very well here the TV already turned on now I will check the point marked as Vdd
All right there I have 16.4 volts
And this was the line that was causing me the problem
There we have 16.4 stable way
Now let's check the dot marked as Vgh very well 28 volts
Now VGL-5 Volts
Now I can tell you that the T-Con card is working properly
Now we will lift the panel and we will check if the fault is definitely resolved
I'm going to lift here with a lot of caution
Very well there how you can see the logo of the brand
It's floating this is the protection screen or screen saver
And we can actually observe that it has worked again in a correct way this panel
There we see in logo of start there to the background we observe the menu of audio and video
Now we can see that the screen has worked properly
We have no stripes or stripes or lines of colors and here because we will only need to connect video signal
And the fault we have solved in a simple and easy Okay
Then gentlemen as you can observe this way we have given solution to this 49 inch LG brand Screen
If you apply this technique because you will certainly be able to solve this and many faults Lque represents these televisions of the new generation
Very good amazing to believe but how can you observe a small component like
This is capable of causing a breakdown like the one we have solved
Very well gentlemen this is another video for the collection of electronic videos Núñez Tutorials
See you until the next tutorial
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